From johnspeth at yahoo.com  Fri May  1 03:24:11 2026
From: johnspeth at yahoo.com (John Speth)
Date: Fri, 1 May 2026 01:24:11 +0000 (UTC)
Subject: [sdiy] LoopMIDI and Win 11
In-Reply-To: <CAG=N=YykXFabLxVyUnO2oZxQ6iO_QTrD5ptUF_6aBAnSs6s5+Q@mail.gmail.com>
References: <9e6b3546-89cc-4db2-9f63-0ad24bbdf7e0.ref@yahoo.com>
 <9e6b3546-89cc-4db2-9f63-0ad24bbdf7e0@yahoo.com>
 <CAG=N=YykXFabLxVyUnO2oZxQ6iO_QTrD5ptUF_6aBAnSs6s5+Q@mail.gmail.com>
Message-ID: <298657392.4980003.1777598651687@mail.yahoo.com>

 How much of windows 11 MIDI is broken? Or did I misunderstand you?
JJS
    On Thursday, April 30, 2026 at 08:20:59 AM PDT, James Coplin <james at ticalun.net> wrote:  
 
 Yes, but can be dicey right now. The new MIDI services that rolled out in February broke lots of things. Patches are coming and fixes for most things are out now and will be rolling out for the next several weeks. There is a Discord group for the Microsoft MIDI services you might want to look up. Everything is there.?
James
On Thu, Apr 30, 2026, 10:12?AM John Speth via Synth-diy <synth-diy at synth-diy.org> wrote:

  
Can anyone tell me if LoopMIDI from Tobias Erichsen works correctly on Windows 11? If not, can anyone recommend an equally useful virtual MIDI port software for Windows 11?
 
My Win10 computer has finally died and I'm now forced to use Win11. I've found LoopMIID to be an indispensable tool for all things MIDI on a PC. I'd love to continue using it.
 
Thanks - John Speth
 

 
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From listmail at misw.us  Fri May  1 04:49:23 2026
From: listmail at misw.us (listmail at misw.us)
Date: Thu, 30 Apr 2026 22:49:23 -0400 (EDT)
Subject: [sdiy] LoopMIDI and Win 11
In-Reply-To: <298657392.4980003.1777598651687@mail.yahoo.com>
References: <9e6b3546-89cc-4db2-9f63-0ad24bbdf7e0.ref@yahoo.com>
 <9e6b3546-89cc-4db2-9f63-0ad24bbdf7e0@yahoo.com>
 <CAG=N=YykXFabLxVyUnO2oZxQ6iO_QTrD5ptUF_6aBAnSs6s5+Q@mail.gmail.com>
 <298657392.4980003.1777598651687@mail.yahoo.com>
Message-ID: <165576813.551456.1777603763305@email.ionos.com>

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From jeff.whitman at icloud.com  Fri May  1 17:08:28 2026
From: jeff.whitman at icloud.com (jeff.whitman at icloud.com)
Date: Fri, 1 May 2026 08:08:28 -0700
Subject: [sdiy] Pole Mixing Multi-Mode filter design with SSI2140
Message-ID: <F39628D5-21D6-4010-9925-3502C4A95D8A@icloud.com>



Hello there,

I?ve been working on an analog synth project for several years using Sound Semiconductor parts. Their data sheets and design notes have been incredibly helpful, especially for those of us who are not primarily analog designers. I?m a firmware engineer by profession - now retired, with an EE background from a long time ago, so I understand the basics but would really appreciate input from people with more analog design experience.

For this project, I?ve built a ?voice? of three oscillator boards using the SSI2131, a filter board using the SSI2140 in the suggested pole-mixing configuration to create a 16-mode multimode filter, a low-pass filter using the SSI2144, and linear-controlled VCAs using the SSI2164.

My questions are specifically around using the SSI2140 for pole mixing. From what I can tell, this design is very similar to the filter used in the Matrix-12, and I?ve spent some time studying that schematic. I?ve also reviewed the AN701 filter design document on the Sound Semiconductor website. I?m including my schematic in PDF form in the hope that some of the very smart analog folks here can offer suggestions about something I?m seeing.

I?ve been using Claude.ai <http://claude.ai/> to help analyze each of my filter configurations and determine whether they are behaving as expected. I?ve also been doing sound comparisons against the Arturia Matrix-12 V modeled synth. One thing I?ve found is that I?m getting DC offset that appears to be coming from the pole outputs of the SSI2140. Depending on the pole-mixing resistor configuration selected for a given filter mode, I?m seeing significant DC offset.

I?ve been feeding Claude scope shots to help analyze this, and so far its interpretation seems pretty consistent with what I?m measuring. As a side note, this has been a very useful application of AI for troubleshooting. For the pole-mixing network, I?m using 1% resistors and also using 1% capacitors, as recommended in the data sheet and AN701.

Here is the table Claude generated from my measurements:

Mode    Mean DC Offset
LP1     -12.5 mV
LP2     -40 mV
LP3     -30 mV
LP4     -30 mV
HP1     -61.9 mV
HP2     -131.1 mV
HP3     -284.4 mV
HP4     -583.6 mV
Claude?s current explanation is that the increasing weighting factors in the pole-mixing network are directly amplifying the DC component.

Things that appear to have been ruled out:

Power supply asymmetry (-11.93 V vs. +12.02 V) ? likely negligible
Input signal DC component ? input is about +117 mV, while U1A shows only -8.33 mV offset
TL074 op-amp offset voltage ? too small to explain this magnitude
Unity-gain buffers ? not populated - I have jumpers.
The suggested fix is to add four 1 ?F film capacitors, such as WIMA MKS2 parts, on the SSI2140 OUT1?OUT4 pins, placed between the OUT pins and the 15k mixing resistors. The idea is that this would block DC before it enters the pole-mixing network, preventing it from being amplified by U1B regardless of filter mode.

I?m curious whether adding these coupling capacitors makes sense, and whether that would be compatible with the intended use of the SSI2140. I?m a little surprised that the data sheet does not discuss the need for them if this is expected behavior. I did find some discussion about this on Mod Wiggler, but I didn?t see a clear conclusion.

I?d appreciate any advice, and hopefully I?ll be able to understand it. Also, if you see any other design issues or possible improvements, I?d be grateful for the feedback ? pun intended.

Thanks,

Jeff

?
Sent by voice-transit conductor

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From johnspeth at yahoo.com  Fri May  1 21:55:02 2026
From: johnspeth at yahoo.com (John Speth)
Date: Fri, 1 May 2026 12:55:02 -0700
Subject: [sdiy] Pole Mixing Multi-Mode filter design with SSI2140
In-Reply-To: <F39628D5-21D6-4010-9925-3502C4A95D8A@icloud.com>
References: <F39628D5-21D6-4010-9925-3502C4A95D8A@icloud.com>
Message-ID: <5e492194-b4de-4c1b-bef8-800af1ee8728@yahoo.com>

Firstly I'm impressed with your resourcefulness. It was a pleasure to 
read your post.

My background is just about the same as yours (EE then FW eng, retired) 
so my answer should be taken with some doubt. In theory, DC blocking 
caps should have no negative effect if there is no need for any DC bias. 
You'll need to make sure the AC impedance doesn't kill the low end of 
your desired frequency spectrum. In other words, calculating the right 
capacitance is important. The theory is easy. An experienced EE should 
be able anticipate any practical problems. I'm sure there are some.

Good Luck - John Speth

On 5/1/2026 8:08 AM, Jeff Whitman via Synth-diy wrote:
>
>
> Hello there,
>
> I?ve been working on an analog synth project for several years using 
> Sound Semiconductor parts. Their data sheets and design notes have 
> been incredibly helpful, especially for those of us who are not 
> primarily analog designers. I?m a firmware engineer by profession - 
> now retired, with an EE background from a long time ago, so I 
> understand the basics but would really appreciate input from people 
> with more analog design experience.
>
> For this project, I?ve built a ?voice? of three oscillator boards 
> using the SSI2131, a filter board using the SSI2140 in the suggested 
> pole-mixing configuration to create a 16-mode multimode filter, a 
> low-pass filter using the SSI2144, and linear-controlled VCAs using 
> the SSI2164.
>
> My questions are specifically around using the SSI2140 for pole 
> mixing. From what I can tell, this design is very similar to the 
> filter used in the Matrix-12, and I?ve spent some time studying that 
> schematic. I?ve also reviewed the AN701 filter design document on the 
> Sound Semiconductor website. I?m including my schematic in PDF form in 
> the hope that some of the very smart analog folks here can offer 
> suggestions about something I?m seeing.
>
> I?ve been using Claude.ai <http://claude.ai/>?to help analyze each of 
> my filter configurations and determine whether they are behaving as 
> expected. I?ve also been doing sound comparisons against the Arturia 
> Matrix-12 V modeled synth. One thing I?ve found is that I?m getting DC 
> offset that appears to be coming from the pole outputs of the SSI2140. 
> Depending on the pole-mixing resistor configuration selected for a 
> given filter mode, I?m seeing significant DC offset.
>
> I?ve been feeding Claude scope shots to help analyze this, and so far 
> its interpretation seems pretty consistent with what I?m measuring. As 
> a side note, this has been a very useful application of AI for 
> troubleshooting. For the pole-mixing network, I?m using 1% resistors 
> and also using 1% capacitors, as recommended in the data sheet and AN701.
>
> Here is the table Claude generated from my measurements:
>
> |Mode Mean DC Offset LP1 -12.5 mV LP2 -40 mV LP3 -30 mV LP4 -30 mV HP1 
> -61.9 mV HP2 -131.1 mV HP3 -284.4 mV HP4 -583.6 mV|
>
> Claude?s current explanation is that the increasing weighting factors 
> in the pole-mixing network are directly amplifying the DC component.
>
> Things that appear to have been ruled out:
>
> |Power supply asymmetry (-11.93 V vs. +12.02 V) ? likely negligible 
> Input signal DC component ? input is about +117 mV, while U1A shows 
> only -8.33 mV offset TL074 op-amp offset voltage ? too small to 
> explain this magnitude Unity-gain buffers ? not populated - I have 
> jumpers.|
>
> The suggested fix is to add four 1 ?F film capacitors, such as WIMA 
> MKS2 parts, on the SSI2140 OUT1?OUT4 pins, placed between the OUT pins 
> and the 15k mixing resistors. The idea is that this would block DC 
> before it enters the pole-mixing network, preventing it from being 
> amplified by U1B regardless of filter mode.
>
> I?m curious whether adding these coupling capacitors makes sense, and 
> whether that would be compatible with the intended use of the SSI2140. 
> I?m a little surprised that the data sheet does not discuss the need 
> for them if this is expected behavior. I did find some discussion 
> about this on Mod Wiggler, but I didn?t see a clear conclusion.
>
> I?d appreciate any advice, and hopefully I?ll be able to understand 
> it. Also, if you see any other design issues or possible improvements, 
> I?d be grateful for the feedback ? pun intended.
>
> Thanks,
>
> Jeff
>
>
>
> Sent by voice-transit conductor
>
>
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to:Synth-diy at synth-diy.org
> View archive at:https://synth-diy.org/pipermail/synth-diy/
> Check your settings at:https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Usemarketplace at synth-diy.org
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From neil.johnson71 at gmail.com  Fri May  1 22:41:33 2026
From: neil.johnson71 at gmail.com (Neil Johnson)
Date: Fri, 1 May 2026 21:41:33 +0100
Subject: [sdiy] Pole Mixing Multi-Mode filter design with SSI2140
In-Reply-To: <F39628D5-21D6-4010-9925-3502C4A95D8A@icloud.com>
References: <F39628D5-21D6-4010-9925-3502C4A95D8A@icloud.com>
Message-ID: <CACZGMxJ5Yw9mg26A+0E4nN-dUSohNBhFGGR0LuN2Qn7xRM6D2Q@mail.gmail.com>

Hi Jeff,

Great to see you continuing on with your project. The issue is caused by
small DC offsets being amplified by the high gain on some of the taps. For
example, the HP4 config has tap gains of {1,4,6,4,1}. Because the offsets
of the individual stages are not the same (see LP1, LP2, LP3 and LP4) then
you will get some resulting offset.

One thing you could try is instead of four capacitors, one for each pole,
you can put one capacitor after the mix resistors just before the virtual
earth summing node of the mixing opamp. This will block any DC present in
the pole outputs, and saves you three large capacitors.

You do raise an interesting point, so I'll see about including something in
the next revision of the datasheet.

Cheers,
Neil


On Fri, 1 May 2026 at 16:13, Jeff Whitman via Synth-diy <
synth-diy at synth-diy.org> wrote:

>
>
> Hello there,
>
> I?ve been working on an analog synth project for several years using Sound
> Semiconductor parts. Their data sheets and design notes have been
> incredibly helpful, especially for those of us who are not primarily analog
> designers. I?m a firmware engineer by profession - now retired, with an EE
> background from a long time ago, so I understand the basics but would
> really appreciate input from people with more analog design experience.
>
> For this project, I?ve built a ?voice? of three oscillator boards using
> the SSI2131, a filter board using the SSI2140 in the suggested pole-mixing
> configuration to create a 16-mode multimode filter, a low-pass filter using
> the SSI2144, and linear-controlled VCAs using the SSI2164.
>
> My questions are specifically around using the SSI2140 for pole mixing.
> From what I can tell, this design is very similar to the filter used in the
> Matrix-12, and I?ve spent some time studying that schematic. I?ve also
> reviewed the AN701 filter design document on the Sound Semiconductor
> website. I?m including my schematic in PDF form in the hope that some of
> the very smart analog folks here can offer suggestions about something I?m
> seeing.
>
> I?ve been using Claude.ai <http://claude.ai/> to help analyze each of my
> filter configurations and determine whether they are behaving as expected.
> I?ve also been doing sound comparisons against the Arturia Matrix-12 V
> modeled synth. One thing I?ve found is that I?m getting DC offset that
> appears to be coming from the pole outputs of the SSI2140. Depending on the
> pole-mixing resistor configuration selected for a given filter mode, I?m
> seeing significant DC offset.
>
> I?ve been feeding Claude scope shots to help analyze this, and so far its
> interpretation seems pretty consistent with what I?m measuring. As a side
> note, this has been a very useful application of AI for troubleshooting.
> For the pole-mixing network, I?m using 1% resistors and also using 1%
> capacitors, as recommended in the data sheet and AN701.
>
> Here is the table Claude generated from my measurements:
>
> Mode    Mean DC Offset
> LP1     -12.5 mV
> LP2     -40 mV
> LP3     -30 mV
> LP4     -30 mV
> HP1     -61.9 mV
> HP2     -131.1 mV
> HP3     -284.4 mV
> HP4     -583.6 mV
>
> Claude?s current explanation is that the increasing weighting factors in
> the pole-mixing network are directly amplifying the DC component.
>
> Things that appear to have been ruled out:
>
> Power supply asymmetry (-11.93 V vs. +12.02 V) ? likely negligible
> Input signal DC component ? input is about +117 mV, while U1A shows only -8.33 mV offset
> TL074 op-amp offset voltage ? too small to explain this magnitude
> Unity-gain buffers ? not populated - I have jumpers.
>
> The suggested fix is to add four 1 ?F film capacitors, such as WIMA MKS2
> parts, on the SSI2140 OUT1?OUT4 pins, placed between the OUT pins and the
> 15k mixing resistors. The idea is that this would block DC before it enters
> the pole-mixing network, preventing it from being amplified by U1B
> regardless of filter mode.
>
> I?m curious whether adding these coupling capacitors makes sense, and
> whether that would be compatible with the intended use of the SSI2140. I?m
> a little surprised that the data sheet does not discuss the need for them
> if this is expected behavior. I did find some discussion about this on Mod
> Wiggler, but I didn?t see a clear conclusion.
>
> I?d appreciate any advice, and hopefully I?ll be able to understand it.
> Also, if you see any other design issues or possible improvements, I?d be
> grateful for the feedback ? pun intended.
>
> Thanks,
>
> Jeff
>
> Sent by voice-transit conductor
>
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org
>
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From jeff.whitman at icloud.com  Sat May  2 00:30:47 2026
From: jeff.whitman at icloud.com (jeff.whitman at icloud.com)
Date: Fri, 1 May 2026 15:30:47 -0700
Subject: [sdiy] Pole Mixing Multi-Mode filter design with SSI2140
In-Reply-To: <5e492194-b4de-4c1b-bef8-800af1ee8728@yahoo.com>
References: <F39628D5-21D6-4010-9925-3502C4A95D8A@icloud.com>
 <5e492194-b4de-4c1b-bef8-800af1ee8728@yahoo.com>
Message-ID: <0F5CDABD-6E5C-47A1-B6C5-6D64D820AD6E@icloud.com>


Thanks for the input, John. This has been a fun project to work on in retirement?and something I?ve wanted to do since the 80s. I went back and checked my git repo history, and it goes back about three years!

Here?s a picture of the setup as it stands now. The firmware runs on an STM32H755ZIQ dual-core. At this point, I?m mostly implementing circuit designs from the SSI documentation?I don?t think I have the analog chops yet to go much beyond that. Filters, in particular, have been the most challenging when it comes to understanding whether they?re behaving as expected. When something doesn?t work correctly on the analog side, I can spend a lot of time scratching my head. Lately, I?ve been using AI to ask questions and get hints on where to look, which has been an interesting?and surprisingly helpful?part of the process.

Over the past year, I?ve also spent a good amount of time designing a control panel with encoders and buttons, along with a UI on an LCD display to tweak parameters in real time. I?ve added support for a touchscreen as well, which I?m hoping to explore next.

On the firmware side, I?ve designed the system to support four timbres and as many voices as I can manage within processing limits?mainly constrained by how quickly I can service the DACs and handle GPIO expanders for voice allocation. My goal is to reach around 24 voices with smaller boards and full surface-mount designs, but I?m taking it in stages so I can properly debug along the way.

?

Sent by voice-transit conductor

> On May 1, 2026, at 12:55?PM, John Speth via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> Firstly I'm impressed with your resourcefulness. It was a pleasure to read your post.
> 
> My background is just about the same as yours (EE then FW eng, retired) so my answer should be taken with some doubt. In theory, DC blocking caps should have no negative effect if there is no need for any DC bias. You'll need to make sure the AC impedance doesn't kill the low end of your desired frequency spectrum. In other words, calculating the right capacitance is important. The theory is easy. An experienced EE should be able anticipate any practical problems. I'm sure there are some.
> 
> Good Luck - John Speth
> 
> On 5/1/2026 8:08 AM, Jeff Whitman via Synth-diy wrote:
>> 
>> 
>> Hello there,
>> 
>> I?ve been working on an analog synth project for several years using Sound Semiconductor parts. Their data sheets and design notes have been incredibly helpful, especially for those of us who are not primarily analog designers. I?m a firmware engineer by profession - now retired, with an EE background from a long time ago, so I understand the basics but would really appreciate input from people with more analog design experience.
>> 
>> For this project, I?ve built a ?voice? of three oscillator boards using the SSI2131, a filter board using the SSI2140 in the suggested pole-mixing configuration to create a 16-mode multimode filter, a low-pass filter using the SSI2144, and linear-controlled VCAs using the SSI2164.
>> 
>> My questions are specifically around using the SSI2140 for pole mixing. From what I can tell, this design is very similar to the filter used in the Matrix-12, and I?ve spent some time studying that schematic. I?ve also reviewed the AN701 filter design document on the Sound Semiconductor website. I?m including my schematic in PDF form in the hope that some of the very smart analog folks here can offer suggestions about something I?m seeing.
>> 
>> I?ve been using Claude.ai <http://claude.ai/> to help analyze each of my filter configurations and determine whether they are behaving as expected. I?ve also been doing sound comparisons against the Arturia Matrix-12 V modeled synth. One thing I?ve found is that I?m getting DC offset that appears to be coming from the pole outputs of the SSI2140. Depending on the pole-mixing resistor configuration selected for a given filter mode, I?m seeing significant DC offset.
>> 
>> I?ve been feeding Claude scope shots to help analyze this, and so far its interpretation seems pretty consistent with what I?m measuring. As a side note, this has been a very useful application of AI for troubleshooting. For the pole-mixing network, I?m using 1% resistors and also using 1% capacitors, as recommended in the data sheet and AN701.
>> 
>> Here is the table Claude generated from my measurements:
>> 
>> Mode    Mean DC Offset
>> LP1     -12.5 mV
>> LP2     -40 mV
>> LP3     -30 mV
>> LP4     -30 mV
>> HP1     -61.9 mV
>> HP2     -131.1 mV
>> HP3     -284.4 mV
>> HP4     -583.6 mV
>> Claude?s current explanation is that the increasing weighting factors in the pole-mixing network are directly amplifying the DC component.
>> 
>> Things that appear to have been ruled out:
>> 
>> Power supply asymmetry (-11.93 V vs. +12.02 V) ? likely negligible
>> Input signal DC component ? input is about +117 mV, while U1A shows only -8.33 mV offset
>> TL074 op-amp offset voltage ? too small to explain this magnitude
>> Unity-gain buffers ? not populated - I have jumpers.
>> The suggested fix is to add four 1 ?F film capacitors, such as WIMA MKS2 parts, on the SSI2140 OUT1?OUT4 pins, placed between the OUT pins and the 15k mixing resistors. The idea is that this would block DC before it enters the pole-mixing network, preventing it from being amplified by U1B regardless of filter mode.
>> 
>> I?m curious whether adding these coupling capacitors makes sense, and whether that would be compatible with the intended use of the SSI2140. I?m a little surprised that the data sheet does not discuss the need for them if this is expected behavior. I did find some discussion about this on Mod Wiggler, but I didn?t see a clear conclusion.
>> 
>> I?d appreciate any advice, and hopefully I?ll be able to understand it. Also, if you see any other design issues or possible improvements, I?d be grateful for the feedback ? pun intended.
>> 
>> Thanks,
>> 
>> Jeff
>> 
>> 
>> 
>> Sent by voice-transit conductor
>> 
>> 
>> 
>> ________________________________________________________
>> This is the Synth-diy mailing list
>> Submit email to: Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
>> View archive at: https://synth-diy.org/pipermail/synth-diy/
>> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
>> Selling or trading? Use marketplace at synth-diy.org <mailto:marketplace at synth-diy.org>
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org

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From jeff.whitman at icloud.com  Sat May  2 00:49:20 2026
From: jeff.whitman at icloud.com (jeff.whitman at icloud.com)
Date: Fri, 1 May 2026 15:49:20 -0700
Subject: [sdiy] Pole Mixing Multi-Mode filter design with SSI2140
In-Reply-To: <CACZGMxJ5Yw9mg26A+0E4nN-dUSohNBhFGGR0LuN2Qn7xRM6D2Q@mail.gmail.com>
References: <F39628D5-21D6-4010-9925-3502C4A95D8A@icloud.com>
 <CACZGMxJ5Yw9mg26A+0E4nN-dUSohNBhFGGR0LuN2Qn7xRM6D2Q@mail.gmail.com>
Message-ID: <EF85E7ED-75D5-464E-AB0F-BA111A7D1B58@icloud.com>


Hi Neil,

Thanks for the input?that?s an interesting idea about adding a single capacitor before the summing op-amp.

It does raise a question I?ve had about how pole-mixing filters behave, and I?ll try to phrase it clearly. Do these two approaches?adding capacitors at the SSI2140 outputs before the summing resistors versus using a single capacitor at the op-amp input?produce different results in terms of filter accuracy across modes?

If the DC offset at each of the four outputs is different (based on the internal design of the SSI2140), wouldn?t that affect how much each pole contributes to the mix? In other words, could it impact the accuracy of the pole mixing itself?which is part of the reason for using 1% resistors?

It?s not immediately intuitive to me that placing a single capacitor at the summing node would yield the same result as blocking DC at each pole output. I?d be interested in your thoughts on whether these two approaches are effectively equivalent, or if there are trade-offs to consider.

Thanks again,

( And yes, I did run my reply through AI so I could try to get the wording correct :). )

Jeff



Sent by voice-transit conductor

> On May 1, 2026, at 1:41?PM, Neil Johnson <neil.johnson71 at gmail.com> wrote:
> 
> Hi Jeff,
> 
> Great to see you continuing on with your project. The issue is caused by small DC offsets being amplified by the high gain on some of the taps. For example, the HP4 config has tap gains of {1,4,6,4,1}. Because the offsets of the individual stages are not the same (see LP1, LP2, LP3 and LP4) then you will get some resulting offset.
> 
> One thing you could try is instead of four capacitors, one for each pole, you can put one capacitor after the mix resistors just before the virtual earth summing node of the mixing opamp. This will block any DC present in the pole outputs, and saves you three large capacitors.
> 
> You do raise an interesting point, so I'll see about including something in the next revision of the datasheet.
> 
> Cheers,
> Neil
> 
> 
> On Fri, 1 May 2026 at 16:13, Jeff Whitman via Synth-diy <synth-diy at synth-diy.org <mailto:synth-diy at synth-diy.org>> wrote:
>> 
>> 
>> Hello there,
>> 
>> I?ve been working on an analog synth project for several years using Sound Semiconductor parts. Their data sheets and design notes have been incredibly helpful, especially for those of us who are not primarily analog designers. I?m a firmware engineer by profession - now retired, with an EE background from a long time ago, so I understand the basics but would really appreciate input from people with more analog design experience.
>> 
>> For this project, I?ve built a ?voice? of three oscillator boards using the SSI2131, a filter board using the SSI2140 in the suggested pole-mixing configuration to create a 16-mode multimode filter, a low-pass filter using the SSI2144, and linear-controlled VCAs using the SSI2164.
>> 
>> My questions are specifically around using the SSI2140 for pole mixing. From what I can tell, this design is very similar to the filter used in the Matrix-12, and I?ve spent some time studying that schematic. I?ve also reviewed the AN701 filter design document on the Sound Semiconductor website. I?m including my schematic in PDF form in the hope that some of the very smart analog folks here can offer suggestions about something I?m seeing.
>> 
>> I?ve been using Claude.ai <http://claude.ai/> to help analyze each of my filter configurations and determine whether they are behaving as expected. I?ve also been doing sound comparisons against the Arturia Matrix-12 V modeled synth. One thing I?ve found is that I?m getting DC offset that appears to be coming from the pole outputs of the SSI2140. Depending on the pole-mixing resistor configuration selected for a given filter mode, I?m seeing significant DC offset.
>> 
>> I?ve been feeding Claude scope shots to help analyze this, and so far its interpretation seems pretty consistent with what I?m measuring. As a side note, this has been a very useful application of AI for troubleshooting. For the pole-mixing network, I?m using 1% resistors and also using 1% capacitors, as recommended in the data sheet and AN701.
>> 
>> Here is the table Claude generated from my measurements:
>> 
>> Mode    Mean DC Offset
>> LP1     -12.5 mV
>> LP2     -40 mV
>> LP3     -30 mV
>> LP4     -30 mV
>> HP1     -61.9 mV
>> HP2     -131.1 mV
>> HP3     -284.4 mV
>> HP4     -583.6 mV
>> Claude?s current explanation is that the increasing weighting factors in the pole-mixing network are directly amplifying the DC component.
>> 
>> Things that appear to have been ruled out:
>> 
>> Power supply asymmetry (-11.93 V vs. +12.02 V) ? likely negligible
>> Input signal DC component ? input is about +117 mV, while U1A shows only -8.33 mV offset
>> TL074 op-amp offset voltage ? too small to explain this magnitude
>> Unity-gain buffers ? not populated - I have jumpers.
>> The suggested fix is to add four 1 ?F film capacitors, such as WIMA MKS2 parts, on the SSI2140 OUT1?OUT4 pins, placed between the OUT pins and the 15k mixing resistors. The idea is that this would block DC before it enters the pole-mixing network, preventing it from being amplified by U1B regardless of filter mode.
>> 
>> I?m curious whether adding these coupling capacitors makes sense, and whether that would be compatible with the intended use of the SSI2140. I?m a little surprised that the data sheet does not discuss the need for them if this is expected behavior. I did find some discussion about this on Mod Wiggler, but I didn?t see a clear conclusion.
>> 
>> I?d appreciate any advice, and hopefully I?ll be able to understand it. Also, if you see any other design issues or possible improvements, I?d be grateful for the feedback ? pun intended.
>> 
>> Thanks,
>> 
>> Jeff
>> 
>> 
>> Sent by voice-transit conductor
>> 
>> ________________________________________________________
>> This is the Synth-diy mailing list
>> Submit email to: Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
>> View archive at: https://synth-diy.org/pipermail/synth-diy/
>> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
>> Selling or trading? Use marketplace at synth-diy.org <mailto:marketplace at synth-diy.org>

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From neil.johnson71 at gmail.com  Sat May  2 01:06:47 2026
From: neil.johnson71 at gmail.com (Neil Johnson)
Date: Sat, 2 May 2026 00:06:47 +0100
Subject: [sdiy] Pole Mixing Multi-Mode filter design with SSI2140
In-Reply-To: <EF85E7ED-75D5-464E-AB0F-BA111A7D1B58@icloud.com>
References: <F39628D5-21D6-4010-9925-3502C4A95D8A@icloud.com>
 <CACZGMxJ5Yw9mg26A+0E4nN-dUSohNBhFGGR0LuN2Qn7xRM6D2Q@mail.gmail.com>
 <EF85E7ED-75D5-464E-AB0F-BA111A7D1B58@icloud.com>
Message-ID: <CACZGMx+E+bM3mxqPWUcE2-fQvNUJvkPOf2QOW6V-Y7cikF42oQ@mail.gmail.com>

Hi Jeff,

Assuming the capacitors are suitably sized they will only affect modes that
are expected to pass DC, so all the LP modes. The HP modes should be ok.

A good read on pole mixing is this paper:
https://pichenettes.github.io/mutable-instruments-diy-archive/static/documents/pole_mixing.pdf

The resistors from each pole set the individual coefficients of each term,
and certain combinations of coefficients lead to interesting filter modes.

The section "MULTI-MODE FILTERS" in the SSI AN701 document also gives some
further background.

Cheers,
Neil


On Fri, 1 May 2026 at 23:49, <jeff.whitman at icloud.com> wrote:

>
> Hi Neil,
>
> Thanks for the input?that?s an interesting idea about adding a single
> capacitor before the summing op-amp.
>
> It does raise a question I?ve had about how pole-mixing filters behave,
> and I?ll try to phrase it clearly. Do these two approaches?adding
> capacitors at the SSI2140 outputs before the summing resistors versus using
> a single capacitor at the op-amp input?produce different results in terms
> of filter accuracy across modes?
>
> If the DC offset at each of the four outputs is different (based on the
> internal design of the SSI2140), wouldn?t that affect how much each pole
> contributes to the mix? In other words, could it impact the accuracy of the
> pole mixing itself?which is part of the reason for using 1% resistors?
>
> It?s not immediately intuitive to me that placing a single capacitor at
> the summing node would yield the same result as blocking DC at each pole
> output. I?d be interested in your thoughts on whether these two approaches
> are effectively equivalent, or if there are trade-offs to consider.
>
> Thanks again,
>
> ( And yes, I did run my reply through AI so I could try to get the wording
> correct :). )
>
> Jeff
>
>
> Sent by voice-transit conductor
>
> On May 1, 2026, at 1:41?PM, Neil Johnson <neil.johnson71 at gmail.com> wrote:
>
> Hi Jeff,
>
> Great to see you continuing on with your project. The issue is caused by
> small DC offsets being amplified by the high gain on some of the taps. For
> example, the HP4 config has tap gains of {1,4,6,4,1}. Because the offsets
> of the individual stages are not the same (see LP1, LP2, LP3 and LP4) then
> you will get some resulting offset.
>
> One thing you could try is instead of four capacitors, one for each pole,
> you can put one capacitor after the mix resistors just before the virtual
> earth summing node of the mixing opamp. This will block any DC present in
> the pole outputs, and saves you three large capacitors.
>
> You do raise an interesting point, so I'll see about including something
> in the next revision of the datasheet.
>
> Cheers,
> Neil
>
>
> On Fri, 1 May 2026 at 16:13, Jeff Whitman via Synth-diy <
> synth-diy at synth-diy.org> wrote:
>
>>
>>
>> Hello there,
>>
>> I?ve been working on an analog synth project for several years using
>> Sound Semiconductor parts. Their data sheets and design notes have been
>> incredibly helpful, especially for those of us who are not primarily analog
>> designers. I?m a firmware engineer by profession - now retired, with an EE
>> background from a long time ago, so I understand the basics but would
>> really appreciate input from people with more analog design experience.
>>
>> For this project, I?ve built a ?voice? of three oscillator boards using
>> the SSI2131, a filter board using the SSI2140 in the suggested pole-mixing
>> configuration to create a 16-mode multimode filter, a low-pass filter using
>> the SSI2144, and linear-controlled VCAs using the SSI2164.
>>
>> My questions are specifically around using the SSI2140 for pole mixing.
>> From what I can tell, this design is very similar to the filter used in the
>> Matrix-12, and I?ve spent some time studying that schematic. I?ve also
>> reviewed the AN701 filter design document on the Sound Semiconductor
>> website. I?m including my schematic in PDF form in the hope that some of
>> the very smart analog folks here can offer suggestions about something I?m
>> seeing.
>>
>> I?ve been using Claude.ai <http://claude.ai/> to help analyze each of my
>> filter configurations and determine whether they are behaving as expected.
>> I?ve also been doing sound comparisons against the Arturia Matrix-12 V
>> modeled synth. One thing I?ve found is that I?m getting DC offset that
>> appears to be coming from the pole outputs of the SSI2140. Depending on the
>> pole-mixing resistor configuration selected for a given filter mode, I?m
>> seeing significant DC offset.
>>
>> I?ve been feeding Claude scope shots to help analyze this, and so far its
>> interpretation seems pretty consistent with what I?m measuring. As a side
>> note, this has been a very useful application of AI for troubleshooting.
>> For the pole-mixing network, I?m using 1% resistors and also using 1%
>> capacitors, as recommended in the data sheet and AN701.
>>
>> Here is the table Claude generated from my measurements:
>>
>> Mode    Mean DC Offset
>> LP1     -12.5 mV
>> LP2     -40 mV
>> LP3     -30 mV
>> LP4     -30 mV
>> HP1     -61.9 mV
>> HP2     -131.1 mV
>> HP3     -284.4 mV
>> HP4     -583.6 mV
>>
>> Claude?s current explanation is that the increasing weighting factors in
>> the pole-mixing network are directly amplifying the DC component.
>>
>> Things that appear to have been ruled out:
>>
>> Power supply asymmetry (-11.93 V vs. +12.02 V) ? likely negligible
>> Input signal DC component ? input is about +117 mV, while U1A shows only -8.33 mV offset
>> TL074 op-amp offset voltage ? too small to explain this magnitude
>> Unity-gain buffers ? not populated - I have jumpers.
>>
>> The suggested fix is to add four 1 ?F film capacitors, such as WIMA MKS2
>> parts, on the SSI2140 OUT1?OUT4 pins, placed between the OUT pins and the
>> 15k mixing resistors. The idea is that this would block DC before it enters
>> the pole-mixing network, preventing it from being amplified by U1B
>> regardless of filter mode.
>>
>> I?m curious whether adding these coupling capacitors makes sense, and
>> whether that would be compatible with the intended use of the SSI2140. I?m
>> a little surprised that the data sheet does not discuss the need for them
>> if this is expected behavior. I did find some discussion about this on Mod
>> Wiggler, but I didn?t see a clear conclusion.
>>
>> I?d appreciate any advice, and hopefully I?ll be able to understand it.
>> Also, if you see any other design issues or possible improvements, I?d be
>> grateful for the feedback ? pun intended.
>>
>> Thanks,
>>
>> Jeff
>>
>> Sent by voice-transit conductor
>>
>> ________________________________________________________
>> This is the Synth-diy mailing list
>> Submit email to: Synth-diy at synth-diy.org
>> View archive at: https://synth-diy.org/pipermail/synth-diy/
>> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
>> Selling or trading? Use marketplace at synth-diy.org
>>
>
>
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From david.dixon at ubc.ca  Sat May  2 02:20:09 2026
From: david.dixon at ubc.ca (Dixon, David)
Date: Sat, 2 May 2026 00:20:09 +0000
Subject: [sdiy] Pole Mixing Multi-Mode filter design with SSI2140
In-Reply-To: <CACZGMxJ5Yw9mg26A+0E4nN-dUSohNBhFGGR0LuN2Qn7xRM6D2Q@mail.gmail.com>
References: <F39628D5-21D6-4010-9925-3502C4A95D8A@icloud.com>
 <CACZGMxJ5Yw9mg26A+0E4nN-dUSohNBhFGGR0LuN2Qn7xRM6D2Q@mail.gmail.com>
Message-ID: <CD09F9A2-689D-496F-9500-6B09381262B0@ubc.ca>

Hello,

I have designed and built the mother of all multimode filters ? it ended up being called the Intellijel Polaris ? so I am pretty familiar with this whole thing.

I don?t remember having significant DC offset issues with that filter.  However, I just built my own version of the Korg PS-3100 and I used the Alfa AS3350 dual SVF chip (24 of them, in fact).  For each channel, I was able to extract LP and BP modes directly, but I had to ?construct? the HP mode by summing the inverted input signal to the LP output.  For whatever reason, there was a significant DC offset on this HP output.  I just threw a 22uF bipolar electrolytic cap on the output and that fixed it right up.

I think it is just the nature of HP outputs to have DC offsets.  So, ditto on Neil?s idea of putting the caps on the HP constructed outputs, not on the chip outputs themselves ? that probably wouldn?t work anyway.

Cheers,
Dave Dixon (aka Doc Sketchy)

On May 1, 2026, at 1:41 PM, Neil Johnson via Synth-diy <Synth-diy at synth-diy.org<mailto:Synth-diy at synth-diy.org>> wrote:

[CAUTION: Non-UBC Email]
Hi Jeff,

Great to see you continuing on with your project. The issue is caused by small DC offsets being amplified by the high gain on some of the taps. For example, the HP4 config has tap gains of {1,4,6,4,1}. Because the offsets of the individual stages are not the same (see LP1, LP2, LP3 and LP4) then you will get some resulting offset.

One thing you could try is instead of four capacitors, one for each pole, you can put one capacitor after the mix resistors just before the virtual earth summing node of the mixing opamp. This will block any DC present in the pole outputs, and saves you three large capacitors.

You do raise an interesting point, so I'll see about including something in the next revision of the datasheet.

Cheers,
Neil


On Fri, 1 May 2026 at 16:13, Jeff Whitman via Synth-diy <synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org>> wrote:



Hello there,

I?ve been working on an analog synth project for several years using Sound Semiconductor parts. Their data sheets and design notes have been incredibly helpful, especially for those of us who are not primarily analog designers. I?m a firmware engineer by profession - now retired, with an EE background from a long time ago, so I understand the basics but would really appreciate input from people with more analog design experience.

For this project, I?ve built a ?voice? of three oscillator boards using the SSI2131, a filter board using the SSI2140 in the suggested pole-mixing configuration to create a 16-mode multimode filter, a low-pass filter using the SSI2144, and linear-controlled VCAs using the SSI2164.

My questions are specifically around using the SSI2140 for pole mixing. From what I can tell, this design is very similar to the filter used in the Matrix-12, and I?ve spent some time studying that schematic. I?ve also reviewed the AN701 filter design document on the Sound Semiconductor website. I?m including my schematic in PDF form in the hope that some of the very smart analog folks here can offer suggestions about something I?m seeing.

I?ve been using Claude.ai<http://claude.ai/> to help analyze each of my filter configurations and determine whether they are behaving as expected. I?ve also been doing sound comparisons against the Arturia Matrix-12 V modeled synth. One thing I?ve found is that I?m getting DC offset that appears to be coming from the pole outputs of the SSI2140. Depending on the pole-mixing resistor configuration selected for a given filter mode, I?m seeing significant DC offset.

I?ve been feeding Claude scope shots to help analyze this, and so far its interpretation seems pretty consistent with what I?m measuring. As a side note, this has been a very useful application of AI for troubleshooting. For the pole-mixing network, I?m using 1% resistors and also using 1% capacitors, as recommended in the data sheet and AN701.

Here is the table Claude generated from my measurements:

Mode    Mean DC Offset
LP1     -12.5 mV
LP2     -40 mV
LP3     -30 mV
LP4     -30 mV
HP1     -61.9 mV
HP2     -131.1 mV
HP3     -284.4 mV
HP4     -583.6 mV

Claude?s current explanation is that the increasing weighting factors in the pole-mixing network are directly amplifying the DC component.

Things that appear to have been ruled out:

Power supply asymmetry (-11.93 V vs. +12.02 V) ? likely negligible
Input signal DC component ? input is about +117 mV, while U1A shows only -8.33 mV offset
TL074 op-amp offset voltage ? too small to explain this magnitude
Unity-gain buffers ? not populated - I have jumpers.

The suggested fix is to add four 1 ?F film capacitors, such as WIMA MKS2 parts, on the SSI2140 OUT1?OUT4 pins, placed between the OUT pins and the 15k mixing resistors. The idea is that this would block DC before it enters the pole-mixing network, preventing it from being amplified by U1B regardless of filter mode.

I?m curious whether adding these coupling capacitors makes sense, and whether that would be compatible with the intended use of the SSI2140. I?m a little surprised that the data sheet does not discuss the need for them if this is expected behavior. I did find some discussion about this on Mod Wiggler, but I didn?t see a clear conclusion.

I?d appreciate any advice, and hopefully I?ll be able to understand it. Also, if you see any other design issues or possible improvements, I?d be grateful for the feedback ? pun intended.

Thanks,

Jeff

Sent by voice-transit conductor

________________________________________________________
This is the Synth-diy mailing list
Submit email to: Synth-diy at synth-diy.org<mailto:Synth-diy at synth-diy.org>
View archive at: https://synth-diy.org/pipermail/synth-diy/
Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
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________________________________________________________
This is the Synth-diy mailing list
Submit email to: Synth-diy at synth-diy.org<mailto:Synth-diy at synth-diy.org>
View archive at: https://synth-diy.org/pipermail/synth-diy/
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From johnspeth at yahoo.com  Sat May  2 21:18:25 2026
From: johnspeth at yahoo.com (John Speth)
Date: Sat, 2 May 2026 12:18:25 -0700
Subject: [sdiy] LoopMIDI and Win 11
In-Reply-To: <298657392.4980003.1777598651687@mail.yahoo.com>
References: <9e6b3546-89cc-4db2-9f63-0ad24bbdf7e0.ref@yahoo.com>
 <9e6b3546-89cc-4db2-9f63-0ad24bbdf7e0@yahoo.com>
 <CAG=N=YykXFabLxVyUnO2oZxQ6iO_QTrD5ptUF_6aBAnSs6s5+Q@mail.gmail.com>
 <298657392.4980003.1777598651687@mail.yahoo.com>
Message-ID: <0289d2f9-c3ae-48cd-9db5-2932aaafc485@yahoo.com>

I did a bit of researching about the bugs. I had no idea that MS's new 
MIDI Services included virtual MIDI cables (the same function as 
LoopMIDI). I also read info that tells me setting it up is not nearly as 
simple as LoopMIDI. *Has anybody reading this tried to use?virtual MIDI 
cables from Windows MIDI Services? Did it work?*

JJS

On 4/30/2026 6:24 PM, John Speth via Synth-diy wrote:
> How much of windows 11 MIDI is broken? Or did I misunderstand you?
>
> JJS
>
> On Thursday, April 30, 2026 at 08:20:59 AM PDT, James Coplin 
> <james at ticalun.net> wrote:
>
>
> Yes, but can be dicey right now. The new MIDI services that rolled out 
> in February broke lots of things. Patches are coming and fixes for 
> most things are out now and will be rolling out for the next several 
> weeks. There is a Discord group for the Microsoft MIDI services you 
> might want to look up. Everything is there.
>
> James
>
> On Thu, Apr 30, 2026, 10:12?AM John Speth via Synth-diy 
> <synth-diy at synth-diy.org> wrote:
>
>     Can anyone tell me if LoopMIDI
>     <https://www.tobias-erichsen.de/software/loopmidi.html> from
>     Tobias Erichsen works correctly on Windows 11? If not, can anyone
>     recommend an equally useful virtual MIDI port software for Windows 11?
>
>     My Win10 computer has finally died and I'm now forced to use
>     Win11. I've found LoopMIID to be an indispensable tool for all
>     things MIDI on a PC. I'd love to continue using it.
>
>     Thanks - John Speth
>
>
>     ________________________________________________________
>     This is the Synth-diy mailing list
>     Submit email to: Synth-diy at synth-diy.org
>     View archive at: https://synth-diy.org/pipermail/synth-diy/
>     Check your settings at:
>     https://synth-diy.org/mailman/listinfo/synth-diy
>     Selling or trading? Use marketplace at synth-diy.org
>
>
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to:Synth-diy at synth-diy.org
> View archive at:https://synth-diy.org/pipermail/synth-diy/
> Check your settings at:https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Usemarketplace at synth-diy.org
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From maohelin at gmail.com  Sun May  3 10:57:21 2026
From: maohelin at gmail.com (Mikko Helin)
Date: Sun, 3 May 2026 11:57:21 +0300
Subject: [sdiy] LoopMIDI and Win 11
In-Reply-To: <0289d2f9-c3ae-48cd-9db5-2932aaafc485@yahoo.com>
References: <9e6b3546-89cc-4db2-9f63-0ad24bbdf7e0.ref@yahoo.com>
 <9e6b3546-89cc-4db2-9f63-0ad24bbdf7e0@yahoo.com>
 <CAG=N=YykXFabLxVyUnO2oZxQ6iO_QTrD5ptUF_6aBAnSs6s5+Q@mail.gmail.com>
 <298657392.4980003.1777598651687@mail.yahoo.com>
 <0289d2f9-c3ae-48cd-9db5-2932aaafc485@yahoo.com>
Message-ID: <CAJ5nAj7cmbod=e5WpF9vNB=Z31R7-CNFvBE1F7OTv3+a8f-QpA@mail.gmail.com>

I haven't tried it yet but guess you need this package from Microsoft:
https://microsoft.github.io/MIDI/get-latest/


On Sat, May 2, 2026 at 10:26?PM John Speth via Synth-diy <
synth-diy at synth-diy.org> wrote:

> I did a bit of researching about the bugs. I had no idea that MS's new
> MIDI Services included virtual MIDI cables (the same function as LoopMIDI).
> I also read info that tells me setting it up is not nearly as simple as
> LoopMIDI. *Has anybody reading this tried to use virtual MIDI cables from
> Windows MIDI Services? Did it work?*
>
> JJS
> On 4/30/2026 6:24 PM, John Speth via Synth-diy wrote:
>
> How much of windows 11 MIDI is broken? Or did I misunderstand you?
>
> JJS
>
> On Thursday, April 30, 2026 at 08:20:59 AM PDT, James Coplin
> <james at ticalun.net> <james at ticalun.net> wrote:
>
>
> Yes, but can be dicey right now. The new MIDI services that rolled out in
> February broke lots of things. Patches are coming and fixes for most things
> are out now and will be rolling out for the next several weeks. There is a
> Discord group for the Microsoft MIDI services you might want to look up.
> Everything is there.
>
> James
>
> On Thu, Apr 30, 2026, 10:12?AM John Speth via Synth-diy <
> synth-diy at synth-diy.org> wrote:
>
> Can anyone tell me if LoopMIDI
> <https://www.tobias-erichsen.de/software/loopmidi.html> from Tobias
> Erichsen works correctly on Windows 11? If not, can anyone recommend an
> equally useful virtual MIDI port software for Windows 11?
>
> My Win10 computer has finally died and I'm now forced to use Win11. I've
> found LoopMIID to be an indispensable tool for all things MIDI on a PC. I'd
> love to continue using it.
>
> Thanks - John Speth
>
>
> ________________________________________________________
> This is the Synth-diy mailing list
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>
>
> ________________________________________________________
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> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
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From maohelin at gmail.com  Sun May  3 11:02:49 2026
From: maohelin at gmail.com (Mikko Helin)
Date: Sun, 3 May 2026 12:02:49 +0300
Subject: [sdiy] LoopMIDI and Win 11
In-Reply-To: <CAJ5nAj7cmbod=e5WpF9vNB=Z31R7-CNFvBE1F7OTv3+a8f-QpA@mail.gmail.com>
References: <9e6b3546-89cc-4db2-9f63-0ad24bbdf7e0.ref@yahoo.com>
 <9e6b3546-89cc-4db2-9f63-0ad24bbdf7e0@yahoo.com>
 <CAG=N=YykXFabLxVyUnO2oZxQ6iO_QTrD5ptUF_6aBAnSs6s5+Q@mail.gmail.com>
 <298657392.4980003.1777598651687@mail.yahoo.com>
 <0289d2f9-c3ae-48cd-9db5-2932aaafc485@yahoo.com>
 <CAJ5nAj7cmbod=e5WpF9vNB=Z31R7-CNFvBE1F7OTv3+a8f-QpA@mail.gmail.com>
Message-ID: <CAJ5nAj6sfznc4UN754V=Ef9PJsTtWbKqeXX1aj5=j8NKs0VJ4A@mail.gmail.com>

After installing the package you restart your computer, and finally start
MIDI Setup Application and finalize the setup.
[image: image.png]

On Sun, May 3, 2026 at 11:57?AM Mikko Helin <maohelin at gmail.com> wrote:

> I haven't tried it yet but guess you need this package from Microsoft:
> https://microsoft.github.io/MIDI/get-latest/
>
>
> On Sat, May 2, 2026 at 10:26?PM John Speth via Synth-diy <
> synth-diy at synth-diy.org> wrote:
>
>> I did a bit of researching about the bugs. I had no idea that MS's new
>> MIDI Services included virtual MIDI cables (the same function as LoopMIDI).
>> I also read info that tells me setting it up is not nearly as simple as
>> LoopMIDI. *Has anybody reading this tried to use virtual MIDI cables
>> from Windows MIDI Services? Did it work?*
>>
>> JJS
>> On 4/30/2026 6:24 PM, John Speth via Synth-diy wrote:
>>
>> How much of windows 11 MIDI is broken? Or did I misunderstand you?
>>
>> JJS
>>
>> On Thursday, April 30, 2026 at 08:20:59 AM PDT, James Coplin
>> <james at ticalun.net> <james at ticalun.net> wrote:
>>
>>
>> Yes, but can be dicey right now. The new MIDI services that rolled out in
>> February broke lots of things. Patches are coming and fixes for most things
>> are out now and will be rolling out for the next several weeks. There is a
>> Discord group for the Microsoft MIDI services you might want to look up.
>> Everything is there.
>>
>> James
>>
>> On Thu, Apr 30, 2026, 10:12?AM John Speth via Synth-diy <
>> synth-diy at synth-diy.org> wrote:
>>
>> Can anyone tell me if LoopMIDI
>> <https://www.tobias-erichsen.de/software/loopmidi.html> from Tobias
>> Erichsen works correctly on Windows 11? If not, can anyone recommend an
>> equally useful virtual MIDI port software for Windows 11?
>>
>> My Win10 computer has finally died and I'm now forced to use Win11. I've
>> found LoopMIID to be an indispensable tool for all things MIDI on a PC. I'd
>> love to continue using it.
>>
>> Thanks - John Speth
>>
>>
>> ________________________________________________________
>> This is the Synth-diy mailing list
>> Submit email to: Synth-diy at synth-diy.org
>> View archive at: https://synth-diy.org/pipermail/synth-diy/
>> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
>> Selling or trading? Use marketplace at synth-diy.org
>>
>>
>> ________________________________________________________
>> This is the Synth-diy mailing list
>> Submit email to: Synth-diy at synth-diy.org
>> View archive at: https://synth-diy.org/pipermail/synth-diy/
>> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
>> Selling or trading? Use marketplace at synth-diy.org
>>
>> ________________________________________________________
>> This is the Synth-diy mailing list
>> Submit email to: Synth-diy at synth-diy.org
>> View archive at: https://synth-diy.org/pipermail/synth-diy/
>> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
>> Selling or trading? Use marketplace at synth-diy.org
>>
>
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From johnspeth at yahoo.com  Sun May  3 17:37:31 2026
From: johnspeth at yahoo.com (John Speth)
Date: Sun, 3 May 2026 08:37:31 -0700
Subject: [sdiy] LoopMIDI and Win 11
In-Reply-To: <0289d2f9-c3ae-48cd-9db5-2932aaafc485@yahoo.com>
References: <9e6b3546-89cc-4db2-9f63-0ad24bbdf7e0.ref@yahoo.com>
 <9e6b3546-89cc-4db2-9f63-0ad24bbdf7e0@yahoo.com>
 <CAG=N=YykXFabLxVyUnO2oZxQ6iO_QTrD5ptUF_6aBAnSs6s5+Q@mail.gmail.com>
 <298657392.4980003.1777598651687@mail.yahoo.com>
 <0289d2f9-c3ae-48cd-9db5-2932aaafc485@yahoo.com>
Message-ID: <7028545a-c1c3-4ea1-9531-fed01d9ec54f@yahoo.com>

I am happy to report that LoopMIDI works on my Win11 computer. It was 
just basic testing. I tested using MIDI-Ox, VMPK keyboard, Cakewalk 
Sonar, and Notation Player 5. Notation Player failed because it refused 
to open any LoopMIDI ports saying that it was a potential infinite loop 
even though it wasn't configured that way. I use it for a lightweight 
way to preview MIDI files so the failure is of no consequence to me.

Thanks - John Speth

On 5/2/2026 12:18 PM, John Speth via Synth-diy wrote:
>
> I did a bit of researching about the bugs. I had no idea that MS's new 
> MIDI Services included virtual MIDI cables (the same function as 
> LoopMIDI). I also read info that tells me setting it up is not nearly 
> as simple as LoopMIDI. *Has anybody reading this tried to use?virtual 
> MIDI cables from Windows MIDI Services? Did it work?*
>
> JJS
>
> On 4/30/2026 6:24 PM, John Speth via Synth-diy wrote:
>> How much of windows 11 MIDI is broken? Or did I misunderstand you?
>>
>> JJS
>>
>> On Thursday, April 30, 2026 at 08:20:59 AM PDT, James Coplin 
>> <james at ticalun.net> wrote:
>>
>>
>> Yes, but can be dicey right now. The new MIDI services that rolled 
>> out in February broke lots of things. Patches are coming and fixes 
>> for most things are out now and will be rolling out for the next 
>> several weeks. There is a Discord group for the Microsoft MIDI 
>> services you might want to look up. Everything is there.
>>
>> James
>>
>> On Thu, Apr 30, 2026, 10:12?AM John Speth via Synth-diy 
>> <synth-diy at synth-diy.org> wrote:
>>
>>     Can anyone tell me if LoopMIDI
>>     <https://www.tobias-erichsen.de/software/loopmidi.html> from
>>     Tobias Erichsen works correctly on Windows 11? If not, can anyone
>>     recommend an equally useful virtual MIDI port software for
>>     Windows 11?
>>
>>     My Win10 computer has finally died and I'm now forced to use
>>     Win11. I've found LoopMIID to be an indispensable tool for all
>>     things MIDI on a PC. I'd love to continue using it.
>>
>>     Thanks - John Speth
>>
>>
>
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From maohelin at gmail.com  Sun May  3 18:10:06 2026
From: maohelin at gmail.com (Mikko Helin)
Date: Sun, 3 May 2026 19:10:06 +0300
Subject: [sdiy] LoopMIDI and Win 11
In-Reply-To: <7028545a-c1c3-4ea1-9531-fed01d9ec54f@yahoo.com>
References: <9e6b3546-89cc-4db2-9f63-0ad24bbdf7e0.ref@yahoo.com>
 <9e6b3546-89cc-4db2-9f63-0ad24bbdf7e0@yahoo.com>
 <CAG=N=YykXFabLxVyUnO2oZxQ6iO_QTrD5ptUF_6aBAnSs6s5+Q@mail.gmail.com>
 <298657392.4980003.1777598651687@mail.yahoo.com>
 <0289d2f9-c3ae-48cd-9db5-2932aaafc485@yahoo.com>
 <7028545a-c1c3-4ea1-9531-fed01d9ec54f@yahoo.com>
Message-ID: <CAJ5nAj6Gko=QPAO89Jr1s8NWG9NNbA=kjzACwc30Ei7Yyg71Jg@mail.gmail.com>

I proceeded to complete the installation of the MIDI services and tools
package, and two MIDI Loopack ports (A and B) were created by default.
Tested them using MIDI piano app from Windows store and Cubase 12 Pro. It
worked fine.

On Sun, May 3, 2026 at 6:45?PM John Speth via Synth-diy <
synth-diy at synth-diy.org> wrote:

> I am happy to report that LoopMIDI works on my Win11 computer. It was just
> basic testing. I tested using MIDI-Ox, VMPK keyboard, Cakewalk Sonar, and
> Notation Player 5. Notation Player failed because it refused to open any
> LoopMIDI ports saying that it was a potential infinite loop even though it
> wasn't configured that way. I use it for a lightweight way to preview MIDI
> files so the failure is of no consequence to me.
>
> Thanks - John Speth
> On 5/2/2026 12:18 PM, John Speth via Synth-diy wrote:
>
> I did a bit of researching about the bugs. I had no idea that MS's new
> MIDI Services included virtual MIDI cables (the same function as LoopMIDI).
> I also read info that tells me setting it up is not nearly as simple as
> LoopMIDI. *Has anybody reading this tried to use virtual MIDI cables from
> Windows MIDI Services? Did it work?*
>
> JJS
> On 4/30/2026 6:24 PM, John Speth via Synth-diy wrote:
>
> How much of windows 11 MIDI is broken? Or did I misunderstand you?
>
> JJS
>
> On Thursday, April 30, 2026 at 08:20:59 AM PDT, James Coplin
> <james at ticalun.net> <james at ticalun.net> wrote:
>
>
> Yes, but can be dicey right now. The new MIDI services that rolled out in
> February broke lots of things. Patches are coming and fixes for most things
> are out now and will be rolling out for the next several weeks. There is a
> Discord group for the Microsoft MIDI services you might want to look up.
> Everything is there.
>
> James
>
> On Thu, Apr 30, 2026, 10:12?AM John Speth via Synth-diy <
> synth-diy at synth-diy.org> wrote:
>
> Can anyone tell me if LoopMIDI
> <https://www.tobias-erichsen.de/software/loopmidi.html> from Tobias
> Erichsen works correctly on Windows 11? If not, can anyone recommend an
> equally useful virtual MIDI port software for Windows 11?
>
> My Win10 computer has finally died and I'm now forced to use Win11. I've
> found LoopMIID to be an indispensable tool for all things MIDI on a PC. I'd
> love to continue using it.
>
> Thanks - John Speth
>
>
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org
>
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From mr at analogue.org  Mon May  4 09:15:43 2026
From: mr at analogue.org (Mattias Rickardsson)
Date: Mon, 4 May 2026 09:15:43 +0200
Subject: [sdiy] Pole Mixing Multi-Mode filter design with SSI2140
In-Reply-To: <F39628D5-21D6-4010-9925-3502C4A95D8A@icloud.com>
References: <F39628D5-21D6-4010-9925-3502C4A95D8A@icloud.com>
Message-ID: <CAP92RBU31WY8j13oxs7sCuN0cOopi0vEcrc47aLV4pYxOgYUbA@mail.gmail.com>

Hi,
Pole mixing is fascinating, but from my experiences from employing it on a
four-pole cascade lowpass filter I'd recommend to think twice. Some
drawbacks are not obvious from the start - in the order of decreasing
obviousness:

- Precision. Especially the resistors need a certain precision, which can
be less fun if looking for those deep notches or if you need matching
stereo pairs or synth voices.

- Noise. The more complex pole mix modes rely on mixing many taps very
loudly and then cancelling out most of their signals except for the desired
ones. The catch is that noise is not cancelled out, and adds together with
lots of gain. Noisefloor is then much higher on some modes.

- Resonance. The pole-mixed filter slopes are correct when the resonance is
turned down, but not when you turn it up. Resonant peaks can then appear in
less desirable ways. Also the stopband suffers: The 4-pole HP mix for
instance is then not 24 dB/oct anymore since an increasing resonance pulls
up a flatter response. I guess it would need some resonance switching
scheme or resonance-dependent pole mixing to get this right.

So in general I'd recommend to stay away from it and create the esoteric
4-pole responses in other ways, unless you want to try it for fun. :-)

But the few pole-mixing possibilities on 2-pole filters work very well!

/mr

PS: I've seen some DC offset issues as well!

Den fre 1 maj 2026 17:12Jeff Whitman via Synth-diy <synth-diy at synth-diy.org>
skrev:

>
>
> Hello there,
>
> I?ve been working on an analog synth project for several years using Sound
> Semiconductor parts. Their data sheets and design notes have been
> incredibly helpful, especially for those of us who are not primarily analog
> designers. I?m a firmware engineer by profession - now retired, with an EE
> background from a long time ago, so I understand the basics but would
> really appreciate input from people with more analog design experience.
>
> For this project, I?ve built a ?voice? of three oscillator boards using
> the SSI2131, a filter board using the SSI2140 in the suggested pole-mixing
> configuration to create a 16-mode multimode filter, a low-pass filter using
> the SSI2144, and linear-controlled VCAs using the SSI2164.
>
> My questions are specifically around using the SSI2140 for pole mixing.
> From what I can tell, this design is very similar to the filter used in the
> Matrix-12, and I?ve spent some time studying that schematic. I?ve also
> reviewed the AN701 filter design document on the Sound Semiconductor
> website. I?m including my schematic in PDF form in the hope that some of
> the very smart analog folks here can offer suggestions about something I?m
> seeing.
>
> I?ve been using Claude.ai <http://claude.ai/> to help analyze each of my
> filter configurations and determine whether they are behaving as expected.
> I?ve also been doing sound comparisons against the Arturia Matrix-12 V
> modeled synth. One thing I?ve found is that I?m getting DC offset that
> appears to be coming from the pole outputs of the SSI2140. Depending on the
> pole-mixing resistor configuration selected for a given filter mode, I?m
> seeing significant DC offset.
>
> I?ve been feeding Claude scope shots to help analyze this, and so far its
> interpretation seems pretty consistent with what I?m measuring. As a side
> note, this has been a very useful application of AI for troubleshooting.
> For the pole-mixing network, I?m using 1% resistors and also using 1%
> capacitors, as recommended in the data sheet and AN701.
>
> Here is the table Claude generated from my measurements:
>
> Mode    Mean DC Offset
> LP1     -12.5 mV
> LP2     -40 mV
> LP3     -30 mV
> LP4     -30 mV
> HP1     -61.9 mV
> HP2     -131.1 mV
> HP3     -284.4 mV
> HP4     -583.6 mV
>
> Claude?s current explanation is that the increasing weighting factors in
> the pole-mixing network are directly amplifying the DC component.
>
> Things that appear to have been ruled out:
>
> Power supply asymmetry (-11.93 V vs. +12.02 V) ? likely negligible
> Input signal DC component ? input is about +117 mV, while U1A shows only -8.33 mV offset
> TL074 op-amp offset voltage ? too small to explain this magnitude
> Unity-gain buffers ? not populated - I have jumpers.
>
> The suggested fix is to add four 1 ?F film capacitors, such as WIMA MKS2
> parts, on the SSI2140 OUT1?OUT4 pins, placed between the OUT pins and the
> 15k mixing resistors. The idea is that this would block DC before it enters
> the pole-mixing network, preventing it from being amplified by U1B
> regardless of filter mode.
>
> I?m curious whether adding these coupling capacitors makes sense, and
> whether that would be compatible with the intended use of the SSI2140. I?m
> a little surprised that the data sheet does not discuss the need for them
> if this is expected behavior. I did find some discussion about this on Mod
> Wiggler, but I didn?t see a clear conclusion.
>
> I?d appreciate any advice, and hopefully I?ll be able to understand it.
> Also, if you see any other design issues or possible improvements, I?d be
> grateful for the feedback ? pun intended.
>
> Thanks,
>
> Jeff
>
> Sent by voice-transit conductor
>
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org
>
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From tom at electricdruid.net  Mon May  4 12:09:38 2026
From: tom at electricdruid.net (Tom Wiltshire)
Date: Mon, 4 May 2026 11:09:38 +0100
Subject: [sdiy] Pole Mixing Multi-Mode filter design with SSI2140
In-Reply-To: <CAP92RBU31WY8j13oxs7sCuN0cOopi0vEcrc47aLV4pYxOgYUbA@mail.gmail.com>
References: <F39628D5-21D6-4010-9925-3502C4A95D8A@icloud.com>
 <CAP92RBU31WY8j13oxs7sCuN0cOopi0vEcrc47aLV4pYxOgYUbA@mail.gmail.com>
Message-ID: <FAE2E753-D963-4817-94A0-276F4764A57E@electricdruid.net>

Just a reminder of this excellent page for experimenting with pole-mixing filter combinations:

https://rnd.expeditionelectronics.com/Diy/Polemixing <https://rnd.expeditionelectronics.com/Diy/Polemixing>

This can show you how sensitive different modes are to tolerances. Shift a mix value very slightly and see what happens. Sometimes it's a lot. 1% precision is probably the *minimum* required for certain responses.

I don't think I agree about Mattias' comment about the 4-pole HP. At least, I can't get the sim to match what he describes, so at least in theory it shouldn't do that.

Tom


> On 4 May 2026, at 08:15, Mattias Rickardsson <mr at analogue.org> wrote:
> 
> Hi, 
> Pole mixing is fascinating, but from my experiences from employing it on a four-pole cascade lowpass filter I'd recommend to think twice. Some drawbacks are not obvious from the start - in the order of decreasing obviousness:
> 
> - Precision. Especially the resistors need a certain precision, which can be less fun if looking for those deep notches or if you need matching stereo pairs or synth voices.
> 
> - Noise. The more complex pole mix modes rely on mixing many taps very loudly and then cancelling out most of their signals except for the desired ones. The catch is that noise is not cancelled out, and adds together with lots of gain. Noisefloor is then much higher on some modes.
> 
> - Resonance. The pole-mixed filter slopes are correct when the resonance is turned down, but not when you turn it up. Resonant peaks can then appear in less desirable ways. Also the stopband suffers: The 4-pole HP mix for instance is then not 24 dB/oct anymore since an increasing resonance pulls up a flatter response. I guess it would need some resonance switching scheme or resonance-dependent pole mixing to get this right.
> 
> So in general I'd recommend to stay away from it and create the esoteric 4-pole responses in other ways, unless you want to try it for fun. :-)
> 
> But the few pole-mixing possibilities on 2-pole filters work very well!
> 
> /mr
> 
> PS: I've seen some DC offset issues as well!
> 
> Den fre 1 maj 2026 17:12Jeff Whitman via Synth-diy <synth-diy at synth-diy.org <mailto:synth-diy at synth-diy.org>> skrev:
> 
> 
> Hello there,
> 
> I?ve been working on an analog synth project for several years using Sound Semiconductor parts. Their data sheets and design notes have been incredibly helpful, especially for those of us who are not primarily analog designers. I?m a firmware engineer by profession - now retired, with an EE background from a long time ago, so I understand the basics but would really appreciate input from people with more analog design experience.
> 
> For this project, I?ve built a ?voice? of three oscillator boards using the SSI2131, a filter board using the SSI2140 in the suggested pole-mixing configuration to create a 16-mode multimode filter, a low-pass filter using the SSI2144, and linear-controlled VCAs using the SSI2164.
> 
> My questions are specifically around using the SSI2140 for pole mixing. From what I can tell, this design is very similar to the filter used in the Matrix-12, and I?ve spent some time studying that schematic. I?ve also reviewed the AN701 filter design document on the Sound Semiconductor website. I?m including my schematic in PDF form in the hope that some of the very smart analog folks here can offer suggestions about something I?m seeing.
> 
> I?ve been using Claude.ai <http://claude.ai/> to help analyze each of my filter configurations and determine whether they are behaving as expected. I?ve also been doing sound comparisons against the Arturia Matrix-12 V modeled synth. One thing I?ve found is that I?m getting DC offset that appears to be coming from the pole outputs of the SSI2140. Depending on the pole-mixing resistor configuration selected for a given filter mode, I?m seeing significant DC offset.
> 
> I?ve been feeding Claude scope shots to help analyze this, and so far its interpretation seems pretty consistent with what I?m measuring. As a side note, this has been a very useful application of AI for troubleshooting. For the pole-mixing network, I?m using 1% resistors and also using 1% capacitors, as recommended in the data sheet and AN701.
> 
> Here is the table Claude generated from my measurements:
> 
> Mode    Mean DC Offset
> LP1     -12.5 mV
> LP2     -40 mV
> LP3     -30 mV
> LP4     -30 mV
> HP1     -61.9 mV
> HP2     -131.1 mV
> HP3     -284.4 mV
> HP4     -583.6 mV
> Claude?s current explanation is that the increasing weighting factors in the pole-mixing network are directly amplifying the DC component.
> 
> Things that appear to have been ruled out:
> 
> Power supply asymmetry (-11.93 V vs. +12.02 V) ? likely negligible
> Input signal DC component ? input is about +117 mV, while U1A shows only -8.33 mV offset
> TL074 op-amp offset voltage ? too small to explain this magnitude
> Unity-gain buffers ? not populated - I have jumpers.
> The suggested fix is to add four 1 ?F film capacitors, such as WIMA MKS2 parts, on the SSI2140 OUT1?OUT4 pins, placed between the OUT pins and the 15k mixing resistors. The idea is that this would block DC before it enters the pole-mixing network, preventing it from being amplified by U1B regardless of filter mode.
> 
> I?m curious whether adding these coupling capacitors makes sense, and whether that would be compatible with the intended use of the SSI2140. I?m a little surprised that the data sheet does not discuss the need for them if this is expected behavior. I did find some discussion about this on Mod Wiggler, but I didn?t see a clear conclusion.
> 
> I?d appreciate any advice, and hopefully I?ll be able to understand it. Also, if you see any other design issues or possible improvements, I?d be grateful for the feedback ? pun intended.
> 
> Thanks,
> 
> Jeff
> 
> 
> Sent by voice-transit conductor
> 
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
> View archive at: https://synth-diy.org/pipermail/synth-diy/ <https://synth-diy.org/pipermail/synth-diy/>
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy <https://synth-diy.org/mailman/listinfo/synth-diy>
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> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
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From jpdesroc at oricom.ca  Mon May  4 15:49:59 2026
From: jpdesroc at oricom.ca (jpdesroc at oricom.ca)
Date: Mon, 4 May 2026 09:49:59 -0400
Subject: [sdiy] First exchanges with ChatGPT... program code extract +
 conversion.. AWESOME !!!
Message-ID: <000001dcdbcc$e6d2ac90$b47805b0$@oricom.ca>

In 1996 I designed a 2 octaves MIDI Bass pedal board

made around what I used at that time.. a Motorola HC811E2 micro.







The circuit included a complete synth structure with ADSR, 2 VCO?s VCA, VCF
and MIDI output.

It still works very well after all those years.

But recently I tried to browse my original program listings and HEX files (.
S19 file for Motorola)

to see what I?d done in the past? but.. no such files left !! Woohh..

Only some hand written schematics and notes on papers.

BUT I also had a pile of 26 pages of the original .LST file which was the
printed results
of the original compiled assembler code that was lost over time..

The assembler compiler I used was IASM11.

Pages like this:







That is what I only had left from my original design..

My goal now was to ?retrieve? my .S19 compiled code from the installed
HC811E2

and save it in case something goes wrong with the micro so I could reprogram
another one. But I did not have the appropriate hardware to read the HC..

So I thought.. Why not redo this design with the same schematic
but using a new PIC micro instead ?

After checking the needed amount of I/O pins I found the PIC16F1789
could be a good replacement..



Since the only thing left of my code were the 26 printed pages
I needed to extract the actual text code from these and save
them in 26 separate .TXT files.

I first scanned all the 26 pages and saved them in JPG format.

Then I browsed the web to find any ?On Line OCR? available

and found some.. But the OCR extractions were not good at all
missing or misreading many characters.. !!

So I thought ChatGPT could be a solution in my case..
My first try with this tool.

I went to ChatGPT and asked it to OCR my first JPG code page
which it did very efficiently !



Ok.. I did the same with all the 26 pages.

26 text files saved.

I then ?merged? in order all these pages in one single page of assembler
code.



So far ChatGPT had been a good partner for my job..



Next step:

I asked ChatGPT to read my  HC811E2 assembler code file and
create a Microchip XC8 C code for PIC16F1789
giving it a clear description of the original HC11 pins number/function
and the new PIC pins number/function to achieve the same job.



Its reply:

The source code is very large (more than 1000 lines with the complete
POT_VAL table),

so to make a clean, reliable and compilable conversion to XC8 for
PIC16F1789, you must proceed in structured phases.



This is the correct method - otherwise you get incorrect or unusable code.

I will therefore continue exactly as in your previous requests, by
generating:



Phase 1

PIC16F1789 Full Hardware Configuration:



CONFIG bits

Internal oscillator 32 MHz + PLL

ADC RA0-RA3

USART MIDI 31250 baud on RC6

PORTB outputs

PORTD entries

RC0-RC5 outputs

Timer1

CCP1 / CCP2 replacement TOC2 / TOC3

global variables HC11 ? C



Phase 2

Conversion of structures:



note tables (DO1 ? DO3)

NOTE/PERIOD structure

table POT_VAL[256]

10-bit ADC reading ? conservation of 8 MSB

automatic table lookup



Phase 3

Conversion of routines:



NOON()

TXMIT()

ADC()

JAR()

ADSR()

SAW()

DEBOUNC()

DEADLINE()



Phase 4

Main logic conversion:



CHANNEL()

TEST()

main loop

NOTE ON / NOTE OFF management

scanning complete crankset

final CCP1/CCP2 interrupts



I then refined my request giving it back its code

and asking it to merge all these 4 phases together
in one single .C program.



I did not include here the final code listed by ChatGPT..

I then checked it carefully for all the Ins, OUTs, interrupts, clock speed,
TIMERs, etc..

Loaded it in MPLAB X compiler and.. IT WORKED !!!!

I couldn?t believe it..

All this result starting from scanned listing pages !!



That?s all I wanted to share with you..

For my needs here.. No special AI software to buy..

I?m very happy !



And,, sorry for this long email but.. Yeah !


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From dave at expeditionelectronics.com  Mon May  4 16:08:17 2026
From: dave at expeditionelectronics.com (David Moylan)
Date: Mon, 4 May 2026 16:08:17 +0200
Subject: [sdiy] Pole Mixing Multi-Mode filter design with SSI2140
In-Reply-To: <FAE2E753-D963-4817-94A0-276F4764A57E@electricdruid.net>
References: <F39628D5-21D6-4010-9925-3502C4A95D8A@icloud.com>
 <CAP92RBU31WY8j13oxs7sCuN0cOopi0vEcrc47aLV4pYxOgYUbA@mail.gmail.com>
 <FAE2E753-D963-4817-94A0-276F4764A57E@electricdruid.net>
Message-ID: <b7498abd-0e09-493f-8203-dadd5b893cce@expeditionelectronics.com>

I agree with Mattias' analysis of the pitfalls, but still think it's 
worthwhile to experiment with.? In practical use I'm not using the HP 
modes much.? I do really like combinations that include a notch, like 
LP1 and LP2 + notch.? I also find 1P LP more useful than expected.

Also, important to remember that there are other feedback types.? 
Bandpass might have less side effects on the HP modes.? It's proven 
useful to prevent bass drop-out for LP modes.

Dave

On 5/4/26 12:09, Tom Wiltshire wrote:
> Just a reminder of this excellent page for experimenting with 
> pole-mixing filter combinations:
>
> https://rnd.expeditionelectronics.com/Diy/Polemixing
>
> This can show you how sensitive different modes are to tolerances. 
> Shift a mix value very slightly and see what happens. Sometimes it's a 
> lot. 1% precision is probably the *minimum* required for certain 
> responses.
>
> I don't think I agree about Mattias' comment about the 4-pole HP. At 
> least, I can't get the sim to match what he describes, so at least in 
> theory it shouldn't do that.
>
> Tom
>
>
>> On 4 May 2026, at 08:15, Mattias Rickardsson <mr at analogue.org> wrote:
>>
>> Hi,
>> Pole mixing is fascinating, but from my experiences from employing it 
>> on a four-pole cascade lowpass filter I'd recommend to think twice. 
>> Some drawbacks are not obvious from the start - in the order of 
>> decreasing obviousness:
>>
>> - Precision. Especially the resistors need a certain precision, which 
>> can be less fun if looking for those deep notches or if you need 
>> matching stereo pairs or synth voices.
>>
>> - Noise. The more complex pole mix modes rely on mixing many taps 
>> very loudly and then cancelling out most of their signals except for 
>> the desired ones. The catch is that noise is not cancelled out, and 
>> adds together with lots of gain. Noisefloor is then much higher on 
>> some modes.
>>
>> - Resonance. The pole-mixed filter slopes are correct when the 
>> resonance is turned down, but not when you turn it up. Resonant peaks 
>> can then appear in less desirable ways. Also the stopband suffers: 
>> The 4-pole HP mix for instance is then not 24 dB/oct anymore since an 
>> increasing resonance pulls up a flatter response. I guess it would 
>> need some resonance switching scheme or resonance-dependent pole 
>> mixing to get this right.
>>
>> So in general I'd recommend to stay away from it and create the 
>> esoteric 4-pole responses in other ways, unless you want to try it 
>> for fun. :-)
>>
>> But the few pole-mixing possibilities on 2-pole filters work very well!
>>
>> /mr
>>
>> PS: I've seen some DC offset issues as well!
>>
>> Den fre 1 maj 2026 17:12Jeff Whitman via Synth-diy 
>> <synth-diy at synth-diy.org> skrev:
>>
>>
>>
>>     Hello there,
>>
>>     I?ve been working on an analog synth project for several years
>>     using Sound Semiconductor parts. Their data sheets and design
>>     notes have been incredibly helpful, especially for those of us
>>     who are not primarily analog designers. I?m a firmware engineer
>>     by profession - now retired, with an EE background from a long
>>     time ago, so I understand the basics but would really appreciate
>>     input from people with more analog design experience.
>>
>>     For this project, I?ve built a ?voice? of three oscillator boards
>>     using the SSI2131, a filter board using the SSI2140 in the
>>     suggested pole-mixing configuration to create a 16-mode multimode
>>     filter, a low-pass filter using the SSI2144, and
>>     linear-controlled VCAs using the SSI2164.
>>
>>     My questions are specifically around using the SSI2140 for pole
>>     mixing. From what I can tell, this design is very similar to the
>>     filter used in the Matrix-12, and I?ve spent some time studying
>>     that schematic. I?ve also reviewed the AN701 filter design
>>     document on the Sound Semiconductor website. I?m including my
>>     schematic in PDF form in the hope that some of the very smart
>>     analog folks here can offer suggestions about something I?m seeing.
>>
>>     I?ve been using Claude.ai <http://claude.ai/>?to help analyze
>>     each of my filter configurations and determine whether they are
>>     behaving as expected. I?ve also been doing sound comparisons
>>     against the Arturia Matrix-12 V modeled synth. One thing I?ve
>>     found is that I?m getting DC offset that appears to be coming
>>     from the pole outputs of the SSI2140. Depending on the
>>     pole-mixing resistor configuration selected for a given filter
>>     mode, I?m seeing significant DC offset.
>>
>>     I?ve been feeding Claude scope shots to help analyze this, and so
>>     far its interpretation seems pretty consistent with what I?m
>>     measuring. As a side note, this has been a very useful
>>     application of AI for troubleshooting. For the pole-mixing
>>     network, I?m using 1% resistors and also using 1% capacitors, as
>>     recommended in the data sheet and AN701.
>>
>>     Here is the table Claude generated from my measurements:
>>
>>     |Mode Mean DC Offset LP1 -12.5 mV LP2 -40 mV LP3 -30 mV LP4 -30
>>     mV HP1 -61.9 mV HP2 -131.1 mV HP3 -284.4 mV HP4 -583.6 mV|
>>
>>     Claude?s current explanation is that the increasing weighting
>>     factors in the pole-mixing network are directly amplifying the DC
>>     component.
>>
>>     Things that appear to have been ruled out:
>>
>>     |Power supply asymmetry (-11.93 V vs. +12.02 V) ? likely
>>     negligible Input signal DC component ? input is about +117 mV,
>>     while U1A shows only -8.33 mV offset TL074 op-amp offset voltage
>>     ? too small to explain this magnitude Unity-gain buffers ? not
>>     populated - I have jumpers.|
>>
>>     The suggested fix is to add four 1 ?F film capacitors, such as
>>     WIMA MKS2 parts, on the SSI2140 OUT1?OUT4 pins, placed between
>>     the OUT pins and the 15k mixing resistors. The idea is that this
>>     would block DC before it enters the pole-mixing network,
>>     preventing it from being amplified by U1B regardless of filter mode.
>>
>>     I?m curious whether adding these coupling capacitors makes sense,
>>     and whether that would be compatible with the intended use of the
>>     SSI2140. I?m a little surprised that the data sheet does not
>>     discuss the need for them if this is expected behavior. I did
>>     find some discussion about this on Mod Wiggler, but I didn?t see
>>     a clear conclusion.
>>
>>     I?d appreciate any advice, and hopefully I?ll be able to
>>     understand it. Also, if you see any other design issues or
>>     possible improvements, I?d be grateful for the feedback ? pun
>>     intended.
>>
>>     Thanks,
>>
>>     Jeff
>>
>>
>>     Sent by voice-transit conductor
>>
>>     ________________________________________________________
>>     This is the Synth-diy mailing list
>>     Submit email to: Synth-diy at synth-diy.org
>>     View archive at: https://synth-diy.org/pipermail/synth-diy/
>>     Check your settings at:
>>     https://synth-diy.org/mailman/listinfo/synth-diy
>>     Selling or trading? Use marketplace at synth-diy.org
>>
>> ________________________________________________________
>> This is the Synth-diy mailing list
>> Submit email to: Synth-diy at synth-diy.org
>> View archive at: https://synth-diy.org/pipermail/synth-diy/
>> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
>> Selling or trading? Use marketplace at synth-diy.org
>
>
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to:Synth-diy at synth-diy.org
> View archive at:https://synth-diy.org/pipermail/synth-diy/
> Check your settings at:https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Usemarketplace at synth-diy.org


-- 
David Moylan
Expedition Electronics
sonic adventures!
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From jeff.whitman at icloud.com  Mon May  4 17:13:28 2026
From: jeff.whitman at icloud.com (jeff.whitman at icloud.com)
Date: Mon, 4 May 2026 08:13:28 -0700
Subject: [sdiy] Pole Mixing Multi-Mode filter design with SSI2140
In-Reply-To: <b7498abd-0e09-493f-8203-dadd5b893cce@expeditionelectronics.com>
References: <F39628D5-21D6-4010-9925-3502C4A95D8A@icloud.com>
 <CAP92RBU31WY8j13oxs7sCuN0cOopi0vEcrc47aLV4pYxOgYUbA@mail.gmail.com>
 <FAE2E753-D963-4817-94A0-276F4764A57E@electricdruid.net>
 <b7498abd-0e09-493f-8203-dadd5b893cce@expeditionelectronics.com>
Message-ID: <A2991773-9641-41E9-A077-5A0A46E79980@icloud.com>

I just want to thank everyone for the incredibly helpful responses and the great pointers to resources for learning more about this type of filter. The synth project I?m working on is really about having fun and continuing to learn?so the journey itself is a big part of the reward. Thanks again to all of you for taking the time to respond.

A few take aways I have so far are: a) The DC offsets I am seeing are expected but do not affect the filter accuracy for pole mixing. b) The resistor accuracy does not have to be off by very much (even using 1% resistors) to considerably affect the filter performance, especially with filter types like Notch. c) At least from experiments, the resonance response may not be what you expect for all filter types with a single resonance feedback architecture. 

Jeff


Sent by voice-transit conductor

> On May 4, 2026, at 7:08?AM, David Moylan via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> I agree with Mattias' analysis of the pitfalls, but still think it's worthwhile to experiment with.  In practical use I'm not using the HP modes much.  I do really like combinations that include a notch, like LP1 and LP2 + notch.  I also find 1P LP more useful than expected.
> 
> Also, important to remember that there are other feedback types.  Bandpass might have less side effects on the HP modes.  It's proven useful to prevent bass drop-out for LP modes.
> 
> Dave
> 
> On 5/4/26 12:09, Tom Wiltshire wrote:
>> Just a reminder of this excellent page for experimenting with pole-mixing filter combinations:
>> 
>> https://rnd.expeditionelectronics.com/Diy/Polemixing
>> 
>> This can show you how sensitive different modes are to tolerances. Shift a mix value very slightly and see what happens. Sometimes it's a lot. 1% precision is probably the *minimum* required for certain responses.
>> 
>> I don't think I agree about Mattias' comment about the 4-pole HP. At least, I can't get the sim to match what he describes, so at least in theory it shouldn't do that.
>> 
>> Tom
>> 
>> 
>>> On 4 May 2026, at 08:15, Mattias Rickardsson <mr at analogue.org <mailto:mr at analogue.org>> wrote:
>>> 
>>> Hi, 
>>> Pole mixing is fascinating, but from my experiences from employing it on a four-pole cascade lowpass filter I'd recommend to think twice. Some drawbacks are not obvious from the start - in the order of decreasing obviousness:
>>> 
>>> - Precision. Especially the resistors need a certain precision, which can be less fun if looking for those deep notches or if you need matching stereo pairs or synth voices.
>>> 
>>> - Noise. The more complex pole mix modes rely on mixing many taps very loudly and then cancelling out most of their signals except for the desired ones. The catch is that noise is not cancelled out, and adds together with lots of gain. Noisefloor is then much higher on some modes.
>>> 
>>> - Resonance. The pole-mixed filter slopes are correct when the resonance is turned down, but not when you turn it up. Resonant peaks can then appear in less desirable ways. Also the stopband suffers: The 4-pole HP mix for instance is then not 24 dB/oct anymore since an increasing resonance pulls up a flatter response. I guess it would need some resonance switching scheme or resonance-dependent pole mixing to get this right.
>>> 
>>> So in general I'd recommend to stay away from it and create the esoteric 4-pole responses in other ways, unless you want to try it for fun. :-)
>>> 
>>> But the few pole-mixing possibilities on 2-pole filters work very well!
>>> 
>>> /mr
>>> 
>>> PS: I've seen some DC offset issues as well!
>>> 
>>> Den fre 1 maj 2026 17:12Jeff Whitman via Synth-diy <synth-diy at synth-diy.org <mailto:synth-diy at synth-diy.org>> skrev:
>>>> 
>>>> 
>>>> Hello there,
>>>> 
>>>> I?ve been working on an analog synth project for several years using Sound Semiconductor parts. Their data sheets and design notes have been incredibly helpful, especially for those of us who are not primarily analog designers. I?m a firmware engineer by profession - now retired, with an EE background from a long time ago, so I understand the basics but would really appreciate input from people with more analog design experience.
>>>> 
>>>> For this project, I?ve built a ?voice? of three oscillator boards using the SSI2131, a filter board using the SSI2140 in the suggested pole-mixing configuration to create a 16-mode multimode filter, a low-pass filter using the SSI2144, and linear-controlled VCAs using the SSI2164.
>>>> 
>>>> My questions are specifically around using the SSI2140 for pole mixing. From what I can tell, this design is very similar to the filter used in the Matrix-12, and I?ve spent some time studying that schematic. I?ve also reviewed the AN701 filter design document on the Sound Semiconductor website. I?m including my schematic in PDF form in the hope that some of the very smart analog folks here can offer suggestions about something I?m seeing.
>>>> 
>>>> I?ve been using Claude.ai <http://claude.ai/> to help analyze each of my filter configurations and determine whether they are behaving as expected. I?ve also been doing sound comparisons against the Arturia Matrix-12 V modeled synth. One thing I?ve found is that I?m getting DC offset that appears to be coming from the pole outputs of the SSI2140. Depending on the pole-mixing resistor configuration selected for a given filter mode, I?m seeing significant DC offset.
>>>> 
>>>> I?ve been feeding Claude scope shots to help analyze this, and so far its interpretation seems pretty consistent with what I?m measuring. As a side note, this has been a very useful application of AI for troubleshooting. For the pole-mixing network, I?m using 1% resistors and also using 1% capacitors, as recommended in the data sheet and AN701.
>>>> 
>>>> Here is the table Claude generated from my measurements:
>>>> 
>>>> Mode    Mean DC Offset
>>>> LP1     -12.5 mV
>>>> LP2     -40 mV
>>>> LP3     -30 mV
>>>> LP4     -30 mV
>>>> HP1     -61.9 mV
>>>> HP2     -131.1 mV
>>>> HP3     -284.4 mV
>>>> HP4     -583.6 mV
>>>> Claude?s current explanation is that the increasing weighting factors in the pole-mixing network are directly amplifying the DC component.
>>>> 
>>>> Things that appear to have been ruled out:
>>>> 
>>>> Power supply asymmetry (-11.93 V vs. +12.02 V) ? likely negligible
>>>> Input signal DC component ? input is about +117 mV, while U1A shows only -8.33 mV offset
>>>> TL074 op-amp offset voltage ? too small to explain this magnitude
>>>> Unity-gain buffers ? not populated - I have jumpers.
>>>> The suggested fix is to add four 1 ?F film capacitors, such as WIMA MKS2 parts, on the SSI2140 OUT1?OUT4 pins, placed between the OUT pins and the 15k mixing resistors. The idea is that this would block DC before it enters the pole-mixing network, preventing it from being amplified by U1B regardless of filter mode.
>>>> 
>>>> I?m curious whether adding these coupling capacitors makes sense, and whether that would be compatible with the intended use of the SSI2140. I?m a little surprised that the data sheet does not discuss the need for them if this is expected behavior. I did find some discussion about this on Mod Wiggler, but I didn?t see a clear conclusion.
>>>> 
>>>> I?d appreciate any advice, and hopefully I?ll be able to understand it. Also, if you see any other design issues or possible improvements, I?d be grateful for the feedback ? pun intended.
>>>> 
>>>> Thanks,
>>>> 
>>>> Jeff
>>>> 
>>>> 
>>>> Sent by voice-transit conductor
>>>> 
>>>> ________________________________________________________
>>>> This is the Synth-diy mailing list
>>>> Submit email to: Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
>>>> View archive at: https://synth-diy.org/pipermail/synth-diy/
>>>> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
>>>> Selling or trading? Use marketplace at synth-diy.org <mailto:marketplace at synth-diy.org>
>>> ________________________________________________________
>>> This is the Synth-diy mailing list
>>> Submit email to: Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
>>> View archive at: https://synth-diy.org/pipermail/synth-diy/
>>> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
>>> Selling or trading? Use marketplace at synth-diy.org <mailto:marketplace at synth-diy.org>
>> 
>> 
>> 
>> ________________________________________________________
>> This is the Synth-diy mailing list
>> Submit email to: Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
>> View archive at: https://synth-diy.org/pipermail/synth-diy/
>> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
>> Selling or trading? Use marketplace at synth-diy.org <mailto:marketplace at synth-diy.org>
> 
> -- 
> David Moylan
> Expedition Electronics
> sonic adventures!
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org

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From jeff.whitman at icloud.com  Mon May  4 17:20:37 2026
From: jeff.whitman at icloud.com (jeff.whitman at icloud.com)
Date: Mon, 4 May 2026 08:20:37 -0700
Subject: [sdiy] Pole Mixing Multi-Mode filter design with SSI2140
In-Reply-To: <FAE2E753-D963-4817-94A0-276F4764A57E@electricdruid.net>
References: <F39628D5-21D6-4010-9925-3502C4A95D8A@icloud.com>
 <CAP92RBU31WY8j13oxs7sCuN0cOopi0vEcrc47aLV4pYxOgYUbA@mail.gmail.com>
 <FAE2E753-D963-4817-94A0-276F4764A57E@electricdruid.net>
Message-ID: <1B30ADC1-98DC-4497-90E4-652954A4B6D6@icloud.com>


Thanks Tom, 

One of the things I wish this page did was to allow me to type in exact (fractional) numbers for the filter poles so I can see the small changes in the response. The sliders are fine, but seem to have a very course resolution. This would allow one to see how the filter responds based on smalls changes in accuracy of resistors. I did not see a way of doing that - is there one?

Thanks

Jeff


Sent by voice-transit conductor

> On May 4, 2026, at 3:09?AM, Tom Wiltshire <tom at electricdruid.net> wrote:
> 
> Just a reminder of this excellent page for experimenting with pole-mixing filter combinations:
> 
> https://rnd.expeditionelectronics.com/Diy/Polemixing
> 
> This can show you how sensitive different modes are to tolerances. Shift a mix value very slightly and see what happens. Sometimes it's a lot. 1% precision is probably the *minimum* required for certain responses.
> 
> I don't think I agree about Mattias' comment about the 4-pole HP. At least, I can't get the sim to match what he describes, so at least in theory it shouldn't do that.
> 
> Tom
> 
> 
>> On 4 May 2026, at 08:15, Mattias Rickardsson <mr at analogue.org <mailto:mr at analogue.org>> wrote:
>> 
>> Hi, 
>> Pole mixing is fascinating, but from my experiences from employing it on a four-pole cascade lowpass filter I'd recommend to think twice. Some drawbacks are not obvious from the start - in the order of decreasing obviousness:
>> 
>> - Precision. Especially the resistors need a certain precision, which can be less fun if looking for those deep notches or if you need matching stereo pairs or synth voices.
>> 
>> - Noise. The more complex pole mix modes rely on mixing many taps very loudly and then cancelling out most of their signals except for the desired ones. The catch is that noise is not cancelled out, and adds together with lots of gain. Noisefloor is then much higher on some modes.
>> 
>> - Resonance. The pole-mixed filter slopes are correct when the resonance is turned down, but not when you turn it up. Resonant peaks can then appear in less desirable ways. Also the stopband suffers: The 4-pole HP mix for instance is then not 24 dB/oct anymore since an increasing resonance pulls up a flatter response. I guess it would need some resonance switching scheme or resonance-dependent pole mixing to get this right.
>> 
>> So in general I'd recommend to stay away from it and create the esoteric 4-pole responses in other ways, unless you want to try it for fun. :-)
>> 
>> But the few pole-mixing possibilities on 2-pole filters work very well!
>> 
>> /mr
>> 
>> PS: I've seen some DC offset issues as well!
>> 
>> Den fre 1 maj 2026 17:12Jeff Whitman via Synth-diy <synth-diy at synth-diy.org <mailto:synth-diy at synth-diy.org>> skrev:
>>> 
>>> 
>>> Hello there,
>>> 
>>> I?ve been working on an analog synth project for several years using Sound Semiconductor parts. Their data sheets and design notes have been incredibly helpful, especially for those of us who are not primarily analog designers. I?m a firmware engineer by profession - now retired, with an EE background from a long time ago, so I understand the basics but would really appreciate input from people with more analog design experience.
>>> 
>>> For this project, I?ve built a ?voice? of three oscillator boards using the SSI2131, a filter board using the SSI2140 in the suggested pole-mixing configuration to create a 16-mode multimode filter, a low-pass filter using the SSI2144, and linear-controlled VCAs using the SSI2164.
>>> 
>>> My questions are specifically around using the SSI2140 for pole mixing. From what I can tell, this design is very similar to the filter used in the Matrix-12, and I?ve spent some time studying that schematic. I?ve also reviewed the AN701 filter design document on the Sound Semiconductor website. I?m including my schematic in PDF form in the hope that some of the very smart analog folks here can offer suggestions about something I?m seeing.
>>> 
>>> I?ve been using Claude.ai <http://claude.ai/> to help analyze each of my filter configurations and determine whether they are behaving as expected. I?ve also been doing sound comparisons against the Arturia Matrix-12 V modeled synth. One thing I?ve found is that I?m getting DC offset that appears to be coming from the pole outputs of the SSI2140. Depending on the pole-mixing resistor configuration selected for a given filter mode, I?m seeing significant DC offset.
>>> 
>>> I?ve been feeding Claude scope shots to help analyze this, and so far its interpretation seems pretty consistent with what I?m measuring. As a side note, this has been a very useful application of AI for troubleshooting. For the pole-mixing network, I?m using 1% resistors and also using 1% capacitors, as recommended in the data sheet and AN701.
>>> 
>>> Here is the table Claude generated from my measurements:
>>> 
>>> Mode    Mean DC Offset
>>> LP1     -12.5 mV
>>> LP2     -40 mV
>>> LP3     -30 mV
>>> LP4     -30 mV
>>> HP1     -61.9 mV
>>> HP2     -131.1 mV
>>> HP3     -284.4 mV
>>> HP4     -583.6 mV
>>> Claude?s current explanation is that the increasing weighting factors in the pole-mixing network are directly amplifying the DC component.
>>> 
>>> Things that appear to have been ruled out:
>>> 
>>> Power supply asymmetry (-11.93 V vs. +12.02 V) ? likely negligible
>>> Input signal DC component ? input is about +117 mV, while U1A shows only -8.33 mV offset
>>> TL074 op-amp offset voltage ? too small to explain this magnitude
>>> Unity-gain buffers ? not populated - I have jumpers.
>>> The suggested fix is to add four 1 ?F film capacitors, such as WIMA MKS2 parts, on the SSI2140 OUT1?OUT4 pins, placed between the OUT pins and the 15k mixing resistors. The idea is that this would block DC before it enters the pole-mixing network, preventing it from being amplified by U1B regardless of filter mode.
>>> 
>>> I?m curious whether adding these coupling capacitors makes sense, and whether that would be compatible with the intended use of the SSI2140. I?m a little surprised that the data sheet does not discuss the need for them if this is expected behavior. I did find some discussion about this on Mod Wiggler, but I didn?t see a clear conclusion.
>>> 
>>> I?d appreciate any advice, and hopefully I?ll be able to understand it. Also, if you see any other design issues or possible improvements, I?d be grateful for the feedback ? pun intended.
>>> 
>>> Thanks,
>>> 
>>> Jeff
>>> 
>>> 
>>> Sent by voice-transit conductor
>>> 
>>> ________________________________________________________
>>> This is the Synth-diy mailing list
>>> Submit email to: Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
>>> View archive at: https://synth-diy.org/pipermail/synth-diy/
>>> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
>>> Selling or trading? Use marketplace at synth-diy.org <mailto:marketplace at synth-diy.org>
>> ________________________________________________________
>> This is the Synth-diy mailing list
>> Submit email to: Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
>> View archive at: https://synth-diy.org/pipermail/synth-diy/
>> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
>> Selling or trading? Use marketplace at synth-diy.org <mailto:marketplace at synth-diy.org>
> 

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From tom at electricdruid.net  Mon May  4 20:58:47 2026
From: tom at electricdruid.net (Tom Wiltshire)
Date: Mon, 4 May 2026 19:58:47 +0100
Subject: [sdiy] Pole Mixing Multi-Mode filter design with SSI2140
In-Reply-To: <1B30ADC1-98DC-4497-90E4-652954A4B6D6@icloud.com>
References: <F39628D5-21D6-4010-9925-3502C4A95D8A@icloud.com>
 <CAP92RBU31WY8j13oxs7sCuN0cOopi0vEcrc47aLV4pYxOgYUbA@mail.gmail.com>
 <FAE2E753-D963-4817-94A0-276F4764A57E@electricdruid.net>
 <1B30ADC1-98DC-4497-90E4-652954A4B6D6@icloud.com>
Message-ID: <31AA4BFF-740D-4E71-A7FB-683DF4394221@electricdruid.net>

Yeah, you can't type numbers in the boxes, but if you select a slider and use the arrow keys you can go up and down in 0.05 increments. That's pretty good.

Dave Moylan who wrote this software is/was on this list, btw.

Tom

> On 4 May 2026, at 16:20, jeff.whitman at icloud.com wrote:
> 
> 
> Thanks Tom, 
> 
> One of the things I wish this page did was to allow me to type in exact (fractional) numbers for the filter poles so I can see the small changes in the response. The sliders are fine, but seem to have a very course resolution. This would allow one to see how the filter responds based on smalls changes in accuracy of resistors. I did not see a way of doing that - is there one?
> 
> Thanks
> 
> Jeff
> 
> 
> Sent by voice-transit conductor
> 
>> On May 4, 2026, at 3:09?AM, Tom Wiltshire <tom at electricdruid.net> wrote:
>> 
>> Just a reminder of this excellent page for experimenting with pole-mixing filter combinations:
>> 
>> https://rnd.expeditionelectronics.com/Diy/Polemixing <https://rnd.expeditionelectronics.com/Diy/Polemixing>
>> 
>> This can show you how sensitive different modes are to tolerances. Shift a mix value very slightly and see what happens. Sometimes it's a lot. 1% precision is probably the *minimum* required for certain responses.
>> 
>> I don't think I agree about Mattias' comment about the 4-pole HP. At least, I can't get the sim to match what he describes, so at least in theory it shouldn't do that.
>> 
>> Tom
>> 
>> 
>>> On 4 May 2026, at 08:15, Mattias Rickardsson <mr at analogue.org <mailto:mr at analogue.org>> wrote:
>>> 
>>> Hi, 
>>> Pole mixing is fascinating, but from my experiences from employing it on a four-pole cascade lowpass filter I'd recommend to think twice. Some drawbacks are not obvious from the start - in the order of decreasing obviousness:
>>> 
>>> - Precision. Especially the resistors need a certain precision, which can be less fun if looking for those deep notches or if you need matching stereo pairs or synth voices.
>>> 
>>> - Noise. The more complex pole mix modes rely on mixing many taps very loudly and then cancelling out most of their signals except for the desired ones. The catch is that noise is not cancelled out, and adds together with lots of gain. Noisefloor is then much higher on some modes.
>>> 
>>> - Resonance. The pole-mixed filter slopes are correct when the resonance is turned down, but not when you turn it up. Resonant peaks can then appear in less desirable ways. Also the stopband suffers: The 4-pole HP mix for instance is then not 24 dB/oct anymore since an increasing resonance pulls up a flatter response. I guess it would need some resonance switching scheme or resonance-dependent pole mixing to get this right.
>>> 
>>> So in general I'd recommend to stay away from it and create the esoteric 4-pole responses in other ways, unless you want to try it for fun. :-)
>>> 
>>> But the few pole-mixing possibilities on 2-pole filters work very well!
>>> 
>>> /mr
>>> 
>>> PS: I've seen some DC offset issues as well!
>>> 
>>> Den fre 1 maj 2026 17:12Jeff Whitman via Synth-diy <synth-diy at synth-diy.org <mailto:synth-diy at synth-diy.org>> skrev:
>>> 
>>> 
>>> Hello there,
>>> 
>>> I?ve been working on an analog synth project for several years using Sound Semiconductor parts. Their data sheets and design notes have been incredibly helpful, especially for those of us who are not primarily analog designers. I?m a firmware engineer by profession - now retired, with an EE background from a long time ago, so I understand the basics but would really appreciate input from people with more analog design experience.
>>> 
>>> For this project, I?ve built a ?voice? of three oscillator boards using the SSI2131, a filter board using the SSI2140 in the suggested pole-mixing configuration to create a 16-mode multimode filter, a low-pass filter using the SSI2144, and linear-controlled VCAs using the SSI2164.
>>> 
>>> My questions are specifically around using the SSI2140 for pole mixing. From what I can tell, this design is very similar to the filter used in the Matrix-12, and I?ve spent some time studying that schematic. I?ve also reviewed the AN701 filter design document on the Sound Semiconductor website. I?m including my schematic in PDF form in the hope that some of the very smart analog folks here can offer suggestions about something I?m seeing.
>>> 
>>> I?ve been using Claude.ai <http://claude.ai/> to help analyze each of my filter configurations and determine whether they are behaving as expected. I?ve also been doing sound comparisons against the Arturia Matrix-12 V modeled synth. One thing I?ve found is that I?m getting DC offset that appears to be coming from the pole outputs of the SSI2140. Depending on the pole-mixing resistor configuration selected for a given filter mode, I?m seeing significant DC offset.
>>> 
>>> I?ve been feeding Claude scope shots to help analyze this, and so far its interpretation seems pretty consistent with what I?m measuring. As a side note, this has been a very useful application of AI for troubleshooting. For the pole-mixing network, I?m using 1% resistors and also using 1% capacitors, as recommended in the data sheet and AN701.
>>> 
>>> Here is the table Claude generated from my measurements:
>>> 
>>> Mode    Mean DC Offset
>>> LP1     -12.5 mV
>>> LP2     -40 mV
>>> LP3     -30 mV
>>> LP4     -30 mV
>>> HP1     -61.9 mV
>>> HP2     -131.1 mV
>>> HP3     -284.4 mV
>>> HP4     -583.6 mV
>>> Claude?s current explanation is that the increasing weighting factors in the pole-mixing network are directly amplifying the DC component.
>>> 
>>> Things that appear to have been ruled out:
>>> 
>>> Power supply asymmetry (-11.93 V vs. +12.02 V) ? likely negligible
>>> Input signal DC component ? input is about +117 mV, while U1A shows only -8.33 mV offset
>>> TL074 op-amp offset voltage ? too small to explain this magnitude
>>> Unity-gain buffers ? not populated - I have jumpers.
>>> The suggested fix is to add four 1 ?F film capacitors, such as WIMA MKS2 parts, on the SSI2140 OUT1?OUT4 pins, placed between the OUT pins and the 15k mixing resistors. The idea is that this would block DC before it enters the pole-mixing network, preventing it from being amplified by U1B regardless of filter mode.
>>> 
>>> I?m curious whether adding these coupling capacitors makes sense, and whether that would be compatible with the intended use of the SSI2140. I?m a little surprised that the data sheet does not discuss the need for them if this is expected behavior. I did find some discussion about this on Mod Wiggler, but I didn?t see a clear conclusion.
>>> 
>>> I?d appreciate any advice, and hopefully I?ll be able to understand it. Also, if you see any other design issues or possible improvements, I?d be grateful for the feedback ? pun intended.
>>> 
>>> Thanks,
>>> 
>>> Jeff
>>> 
>>> 
>>> Sent by voice-transit conductor
>>> 
>>> ________________________________________________________
>>> This is the Synth-diy mailing list
>>> Submit email to: Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
>>> View archive at: https://synth-diy.org/pipermail/synth-diy/ <https://synth-diy.org/pipermail/synth-diy/>
>>> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy <https://synth-diy.org/mailman/listinfo/synth-diy>
>>> Selling or trading? Use marketplace at synth-diy.org <mailto:marketplace at synth-diy.org>
>>> ________________________________________________________
>>> This is the Synth-diy mailing list
>>> Submit email to: Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
>>> View archive at: https://synth-diy.org/pipermail/synth-diy/ <https://synth-diy.org/pipermail/synth-diy/>
>>> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy <https://synth-diy.org/mailman/listinfo/synth-diy>
>>> Selling or trading? Use marketplace at synth-diy.org <mailto:marketplace at synth-diy.org>
>> 
> 

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From jeff.whitman at icloud.com  Mon May  4 21:28:00 2026
From: jeff.whitman at icloud.com (Jeffrey Whitman)
Date: Mon, 4 May 2026 12:28:00 -0700
Subject: [sdiy] Pole Mixing Multi-Mode filter design with SSI2140
In-Reply-To: <31AA4BFF-740D-4E71-A7FB-683DF4394221@electricdruid.net>
References: <31AA4BFF-740D-4E71-A7FB-683DF4394221@electricdruid.net>
Message-ID: <943C3CAC-69B4-4E94-AE03-C564C91C19F4@icloud.com>

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From thomas.hudson7 at icloud.com  Tue May  5 03:14:36 2026
From: thomas.hudson7 at icloud.com (Thomas Hudson)
Date: Mon, 4 May 2026 21:14:36 -0400
Subject: [sdiy] Scott Lee of Paia has died
Message-ID: <9AD9AD98-D85F-4E3B-9332-0D75F5C1B03F@icloud.com>

My first modular I built from a Paia kit, a 4700/j. I think it had three VCOs, two VCFs and two VCAs and EGs. This was my introduction to modular. It started my journey into modular. It also had a 6503 processor built into the keyboard. 

A  Scientific American Magazine by Martin Gardener wrote how music statistically was pink noise, or 1/f. Someone created software, Pink Freud tha would do cannons, and John Simonton wrote something called Pink tunes. It was so good, Larry Fast used  it on one of his albums.

It was my introduction to generative music.

When John passed, Scott kept Paia alive. RIP to both of you.



https://paia.com/?
In Memorium
paia.com

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From n.dinapoli at ymail.com  Tue May  5 03:35:44 2026
From: n.dinapoli at ymail.com (=?UTF-8?Q?Nicol=C3=A1s_Dinapoli_Fari=C3=B1a?=)
Date: Tue, 5 May 2026 01:35:44 +0000 (UTC)
Subject: [sdiy] Scott Lee of Paia has died
In-Reply-To: <9AD9AD98-D85F-4E3B-9332-0D75F5C1B03F@icloud.com>
References: <9AD9AD98-D85F-4E3B-9332-0D75F5C1B03F@icloud.com>
Message-ID: <939823005.4065670.1777944944880@mail.yahoo.com>

I have one of the maybe five PAiA 2700 systems in Argentina.I also have a copy of that scientific american magazine, and, a few years back I tried to convince a friend to port the PAiA software to an arduino based device.I always thought they were the underdog, in terms of publicity. They were using computers to drive modular stuff before the Buchla 300 came out, I believe.
Thanks to both of them, and rest in peace.

Yahoo Mail: busca, organiza, toma el control de tu buz?n 
 
  El lun., 4 de may. de 2026 a la(s) 22:15, Thomas Hudson via Synth-diy<synth-diy at synth-diy.org> escribi?:   
My first modular I built from a Paia kit, a 4700/j. I think it had three VCOs, two VCFs and two VCAs and EGs. This was my introduction to modular. It started my journey into modular. It also had a 6503 processor built into the keyboard. 

A Scientific American Magazine by Martin Gardener wrote how music statistically was pink noise, or 1/f. Someone created software, Pink Freud tha would do cannons, and John Simonton wrote something called Pink tunes. It was so good, Larry Fast used it on one of his albums.

It was my introduction to generative music.

When John passed, Scott kept Paia alive. RIP to both of you.






|  |
| 
| In Memoriumpaia.com |

 |


________________________________________________________
This is the Synth-diy mailing list
Submit email to: Synth-diy at synth-diy.org
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From btremblay at me.com  Tue May  5 03:57:30 2026
From: btremblay at me.com (Benjamin Tremblay)
Date: Mon, 4 May 2026 21:57:30 -0400
Subject: [sdiy] Scott Lee of Paia has died
In-Reply-To: <9AD9AD98-D85F-4E3B-9332-0D75F5C1B03F@icloud.com>
References: <9AD9AD98-D85F-4E3B-9332-0D75F5C1B03F@icloud.com>
Message-ID: <54758E3F-A8D1-41E7-8CAF-39E9224A47A0@me.com>

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From btremblay at me.com  Tue May  5 04:11:25 2026
From: btremblay at me.com (Benjamin Tremblay)
Date: Mon, 4 May 2026 22:11:25 -0400
Subject: [sdiy] Scott Lee of Paia has died
In-Reply-To: <54758E3F-A8D1-41E7-8CAF-39E9224A47A0@me.com>
References: <54758E3F-A8D1-41E7-8CAF-39E9224A47A0@me.com>
Message-ID: <72FF0F57-8B45-4F22-854B-7091416446DF@me.com>

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From oleavitt at proton.me  Tue May  5 04:26:43 2026
From: oleavitt at proton.me (Oren Leavitt)
Date: Tue, 05 May 2026 02:26:43 +0000
Subject: [sdiy] Scott Lee of Paia has died
In-Reply-To: <9AD9AD98-D85F-4E3B-9332-0D75F5C1B03F@icloud.com>
References: <9AD9AD98-D85F-4E3B-9332-0D75F5C1B03F@icloud.com>
Message-ID: <0a11a729-1baf-4a72-b81e-8c35f811539a@proton.me>

RIP Scott Lee. Rest in peace both you and John.
Started getting into PAiA gear some 40+ years ago. Still have my Vocoder 
and Hot Springs reverb kits I built back then.
Still wished I had the 2720 synth that I bought at a Goodwill thrift 
store in 1985 for $10.

On 5/4/26 8:14 PM, Thomas Hudson via Synth-diy wrote:
> My first modular I built from a Paia kit, a 4700/j. I think it had three 
> VCOs, two VCFs and two VCAs and EGs. This was my introduction to 
> modular. It started my journey into modular. It also had a 6503 
> processor built into the keyboard.
> 
> A Scientific American Magazine by Martin Gardener wrote how music 
> statistically was pink noise, or 1/f. Someone created software, Pink 
> Freud tha would do cannons, and John Simonton wrote something called 
> Pink tunes. It was so good, Larry Fast used it on one of his albums.
> 
> It was my introduction to generative music.
> 
> When John passed, Scott kept Paia alive. RIP to both of you.
> 
> 
> IMG_4489.png
> In Memorium <https://paia.com/>
> paia.com <https://paia.com/>
> 
> <https://paia.com/>
> 




From Peter.Ullrich at kapsch.net  Tue May  5 09:32:09 2026
From: Peter.Ullrich at kapsch.net (Peter Ullrich)
Date: Tue, 5 May 2026 07:32:09 +0000
Subject: [sdiy] First exchanges with ChatGPT... program code extract +
 conversion.. AWESOME !!!
In-Reply-To: <000001dcdbcc$e6d2ac90$b47805b0$@oricom.ca>
References: <000001dcdbcc$e6d2ac90$b47805b0$@oricom.ca>
Message-ID: <AS1PR03MB8287631712B80641FEC6D715943E2@AS1PR03MB8287.eurprd03.prod.outlook.com>

Hi Jean-Paul!

Wow, what an amazing project!
I am really astonished that it worked!
Thank you for your insights!

Maybe I should convert my old 8051 synth addon projects written in PL/M-51 and Assembler-51 to AVR microcontrollers to keep them alive?

Ciao
Peter

Web page: http://ullrich.great-site.net/
Datadial (Synth Add-On): http://ullrich.great-site.net/f_music4.htm
Roland Sampler Tool Sxxx: http://ullrich.great-site.net/f_music5.htm

Von: Synth-diy <synth-diy-bounces at synth-diy.org> Im Auftrag von Jean-Pierre Desrochers via Synth-diy
Gesendet: Montag, 4. Mai 2026 15:50
An: Synth-diy at synth-diy.org
Betreff: *EXT* [sdiy] First exchanges with ChatGPT... program code extract + conversion.. AWESOME !!!

In 1996 I designed a 2 octaves MIDI Bass pedal board
made around what I used at that time.. a Motorola HC811E2 micro.

[cid:image001.jpg at 01DCDC71.A3B8E190]

The circuit included a complete synth structure with ADSR, 2 VCO?s VCA, VCF and MIDI output.
It still works very well after all those years.
But recently I tried to browse my original program listings and HEX files (.S19 file for Motorola)
to see what I?d done in the past? but.. no such files left !! Woohh..
Only some hand written schematics and notes on papers.
BUT I also had a pile of 26 pages of the original .LST file which was the printed results
of the original compiled assembler code that was lost over time..
The assembler compiler I used was IASM11.
Pages like this:

[cid:image002.png at 01DCDC71.A3B8E190]

That is what I only had left from my original design..
My goal now was to ?retrieve? my .S19 compiled code from the installed HC811E2
and save it in case something goes wrong with the micro so I could reprogram
another one. But I did not have the appropriate hardware to read the HC..
So I thought.. Why not redo this design with the same schematic
but using a new PIC micro instead ?
After checking the needed amount of I/O pins I found the PIC16F1789
could be a good replacement..

Since the only thing left of my code were the 26 printed pages
I needed to extract the actual text code from these and save
them in 26 separate .TXT files.
I first scanned all the 26 pages and saved them in JPG format.
Then I browsed the web to find any ?On Line OCR? available
and found some.. But the OCR extractions were not good at all
missing or misreading many characters.. !!
So I thought ChatGPT could be a solution in my case..
My first try with this tool.
I went to ChatGPT and asked it to OCR my first JPG code page
which it did very efficiently !

Ok.. I did the same with all the 26 pages.
26 text files saved.
I then ?merged? in order all these pages in one single page of assembler code.

So far ChatGPT had been a good partner for my job..

Next step:
I asked ChatGPT to read my  HC811E2 assembler code file and
create a Microchip XC8 C code for PIC16F1789
giving it a clear description of the original HC11 pins number/function
and the new PIC pins number/function to achieve the same job.

Its reply:
The source code is very large (more than 1000 lines with the complete POT_VAL table),
so to make a clean, reliable and compilable conversion to XC8 for PIC16F1789, you must proceed in structured phases.

This is the correct method - otherwise you get incorrect or unusable code.
I will therefore continue exactly as in your previous requests, by generating:

Phase 1
PIC16F1789 Full Hardware Configuration:

CONFIG bits
Internal oscillator 32 MHz + PLL
ADC RA0-RA3
USART MIDI 31250 baud on RC6
PORTB outputs
PORTD entries
RC0-RC5 outputs
Timer1
CCP1 / CCP2 replacement TOC2 / TOC3
global variables HC11 ? C

Phase 2
Conversion of structures:

note tables (DO1 ? DO3)
NOTE/PERIOD structure
table POT_VAL[256]
10-bit ADC reading ? conservation of 8 MSB
automatic table lookup

Phase 3
Conversion of routines:

NOON()
TXMIT()
ADC()
JAR()
ADSR()
SAW()
DEBOUNC()
DEADLINE()

Phase 4
Main logic conversion:

CHANNEL()
TEST()
main loop
NOTE ON / NOTE OFF management
scanning complete crankset
final CCP1/CCP2 interrupts

I then refined my request giving it back its code
and asking it to merge all these 4 phases together
in one single .C program.

I did not include here the final code listed by ChatGPT..
I then checked it carefully for all the Ins, OUTs, interrupts, clock speed, TIMERs, etc..
Loaded it in MPLAB X compiler and.. IT WORKED !!!!
I couldn?t believe it..
All this result starting from scanned listing pages !!

That?s all I wanted to share with you..
For my needs here.. No special AI software to buy..
I?m very happy !

And,, sorry for this long email but.. Yeah !



The information contained in this e-mail message is privileged and confidential and is for the exclusive use of the addressee. The person who receives this message and who is not the addressee, one of his employees or an agent entitled to hand it over to the addressee, is informed that he may not use, disclose or reproduce the contents thereof, and is kindly asked to notify the sender and delete the e-mail immediately.

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From jpdesroc at oricom.ca  Tue May  5 15:34:44 2026
From: jpdesroc at oricom.ca (jpdesroc at oricom.ca)
Date: Tue, 5 May 2026 09:34:44 -0400
Subject: [sdiy] First exchanges with ChatGPT... program code extract +
 conversion.. AWESOME !!!
In-Reply-To: <AS1PR03MB8287631712B80641FEC6D715943E2@AS1PR03MB8287.eurprd03.prod.outlook.com>
References: <000001dcdbcc$e6d2ac90$b47805b0$@oricom.ca>
 <AS1PR03MB8287631712B80641FEC6D715943E2@AS1PR03MB8287.eurprd03.prod.outlook.com>
Message-ID: <001701dcdc93$efecd090$cfc671b0$@oricom.ca>

Thank You Peter for your nice words.

I?m surprised nobody replied to this story..

 

? Maybe I should convert my old 8051 synth addon projects written in PL/M-51 and Assembler-51 to AVR microcontrollers to keep them alive?

Give it a try !

 

De : Peter Ullrich <Peter.Ullrich at kapsch.net> 
Envoy? : 5 mai 2026 03:32
? : jpdesroc at oricom.ca; Synth-diy at synth-diy.org
Objet : Re: [sdiy] First exchanges with ChatGPT... program code extract + conversion.. AWESOME !!!

 

Hi Jean-Paul!

 

Wow, what an amazing project!

I am really astonished that it worked!

Thank you for your insights!

 

Maybe I should convert my old 8051 synth addon projects written in PL/M-51 and Assembler-51 to AVR microcontrollers to keep them alive?

 

Ciao
Peter

 

Web page:  <http://ullrich.great-site.net/> http://ullrich.great-site.net/
Datadial (Synth Add-On):  <http://ullrich.great-site.net/f_music4.htm> http://ullrich.great-site.net/f_music4.htm
Roland Sampler Tool Sxxx:  <http://ullrich.great-site.net/f_music5.htm> http://ullrich.great-site.net/f_music5.htm

 

Von: Synth-diy <synth-diy-bounces at synth-diy.org <mailto:synth-diy-bounces at synth-diy.org> > Im Auftrag von Jean-Pierre Desrochers via Synth-diy
Gesendet: Montag, 4. Mai 2026 15:50
An: Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org> 
Betreff: *EXT* [sdiy] First exchanges with ChatGPT... program code extract + conversion.. AWESOME !!!

 

In 1996 I designed a 2 octaves MIDI Bass pedal board

made around what I used at that time.. a Motorola HC811E2 micro.

 



 

The circuit included a complete synth structure with ADSR, 2 VCO?s VCA, VCF and MIDI output.

It still works very well after all those years.

But recently I tried to browse my original program listings and HEX files (.S19 file for Motorola)

to see what I?d done in the past? but.. no such files left !! Woohh.. 

Only some hand written schematics and notes on papers.

BUT I also had a pile of 26 pages of the original .LST file which was the printed results
of the original compiled assembler code that was lost over time..

The assembler compiler I used was IASM11.

Pages like this:

 



 

That is what I only had left from my original design..

My goal now was to ?retrieve? my .S19 compiled code from the installed HC811E2

and save it in case something goes wrong with the micro so I could reprogram
another one. But I did not have the appropriate hardware to read the HC..

So I thought.. Why not redo this design with the same schematic
but using a new PIC micro instead ?

After checking the needed amount of I/O pins I found the PIC16F1789
could be a good replacement..

 

Since the only thing left of my code were the 26 printed pages
I needed to extract the actual text code from these and save
them in 26 separate .TXT files.

I first scanned all the 26 pages and saved them in JPG format.

Then I browsed the web to find any ?On Line OCR? available

and found some.. But the OCR extractions were not good at all
missing or misreading many characters.. !!

So I thought ChatGPT could be a solution in my case..
My first try with this tool.

I went to ChatGPT and asked it to OCR my first JPG code page
which it did very efficiently !

 

Ok.. I did the same with all the 26 pages. 

26 text files saved.

I then ?merged? in order all these pages in one single page of assembler code.

 

So far ChatGPT had been a good partner for my job..

 

Next step:

I asked ChatGPT to read my  HC811E2 assembler code file and
create a Microchip XC8 C code for PIC16F1789
giving it a clear description of the original HC11 pins number/function
and the new PIC pins number/function to achieve the same job.

 

Its reply:

The source code is very large (more than 1000 lines with the complete POT_VAL table), 

so to make a clean, reliable and compilable conversion to XC8 for PIC16F1789, you must proceed in structured phases.

 

This is the correct method ? otherwise you get incorrect or unusable code.

I will therefore continue exactly as in your previous requests, by generating:

 

Phase 1

PIC16F1789 Full Hardware Configuration:

 

CONFIG bits

Internal oscillator 32 MHz + PLL

ADC RA0?RA3

USART MIDI 31250 baud on RC6

PORTB outputs

PORTD entries

RC0?RC5 outputs

Timer1

CCP1 / CCP2 replacement TOC2 / TOC3

global variables HC11 ? C

 

Phase 2

Conversion of structures:

 

note tables (DO1 ? DO3)

NOTE/PERIOD structure

table POT_VAL[256]

10-bit ADC reading ? conservation of 8 MSB

automatic table lookup

 

Phase 3

Conversion of routines:

 

NOON()

TXMIT()

ADC()

JAR()

ADSR()

SAW()

DEBOUNC()

DEADLINE()

 

Phase 4

Main logic conversion:

 

CHANNEL()

TEST()

main loop

NOTE ON / NOTE OFF management

scanning complete crankset

final CCP1/CCP2 interrupts

 

I then refined my request giving it back its code

and asking it to merge all these 4 phases together
in one single .C program.

 

I did not include here the final code listed by ChatGPT..

I then checked it carefully for all the Ins, OUTs, interrupts, clock speed, TIMERs, etc..

Loaded it in MPLAB X compiler and.. IT WORKED !!!!

I couldn?t believe it.. 

All this result starting from scanned listing pages !!

 

That?s all I wanted to share with you..

For my needs here.. No special AI software to buy..

I?m very happy !

 

And,, sorry for this long email but.. Yeah !




The information contained in this e-mail message is privileged and confidential and is for the exclusive use of the addressee. The person who receives this message and who is not the addressee, one of his employees or an agent entitled to hand it over to the addressee, is informed that he may not use, disclose or reproduce the contents thereof, and is kindly asked to notify the sender and delete the e-mail immediately.

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From mbryant at futurehorizons.com  Tue May  5 15:54:05 2026
From: mbryant at futurehorizons.com (Mike Bryant)
Date: Tue, 5 May 2026 13:54:05 +0000
Subject: [sdiy] First exchanges with ChatGPT... program code extract +
 conversion.. AWESOME !!!
In-Reply-To: <001701dcdc93$efecd090$cfc671b0$@oricom.ca>
References: <000001dcdbcc$e6d2ac90$b47805b0$@oricom.ca>
 <AS1PR03MB8287631712B80641FEC6D715943E2@AS1PR03MB8287.eurprd03.prod.outlook.com>
 <001701dcdc93$efecd090$cfc671b0$@oricom.ca>
Message-ID: <CWLP265MB7132BCD778BABCF9F3E17B8ADB3E2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>

  *
I?m surprised nobody replied to this story..

I think we were all so gobsmacked by it working there was nothing left to say ?
________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Jean-Pierre Desrochers via Synth-diy <synth-diy at synth-diy.org>
Sent: 05 May 2026 14:34
To: 'Peter Ullrich' <Peter.Ullrich at kapsch.net>; Synth-diy at synth-diy.org <Synth-diy at synth-diy.org>
Subject: Re: [sdiy] First exchanges with ChatGPT... program code extract + conversion.. AWESOME !!!


Thank You Peter for your nice words.

I?m surprised nobody replied to this story..



? Maybe I should convert my old 8051 synth addon projects written in PL/M-51 and Assembler-51 to AVR microcontrollers to keep them alive?

Give it a try !



De : Peter Ullrich <Peter.Ullrich at kapsch.net>
Envoy? : 5 mai 2026 03:32
? : jpdesroc at oricom.ca; Synth-diy at synth-diy.org
Objet : Re: [sdiy] First exchanges with ChatGPT... program code extract + conversion.. AWESOME !!!



Hi Jean-Paul!



Wow, what an amazing project!

I am really astonished that it worked!

Thank you for your insights!



Maybe I should convert my old 8051 synth addon projects written in PL/M-51 and Assembler-51 to AVR microcontrollers to keep them alive?



Ciao
Peter



Web page: http://ullrich.great-site.net/
Datadial (Synth Add-On): http://ullrich.great-site.net/f_music4.htm
Roland Sampler Tool Sxxx: http://ullrich.great-site.net/f_music5.htm



Von: Synth-diy <synth-diy-bounces at synth-diy.org<mailto:synth-diy-bounces at synth-diy.org>> Im Auftrag von Jean-Pierre Desrochers via Synth-diy
Gesendet: Montag, 4. Mai 2026 15:50
An: Synth-diy at synth-diy.org<mailto:Synth-diy at synth-diy.org>
Betreff: *EXT* [sdiy] First exchanges with ChatGPT... program code extract + conversion.. AWESOME !!!



In 1996 I designed a 2 octaves MIDI Bass pedal board

made around what I used at that time.. a Motorola HC811E2 micro.



[cid:image001.jpg at 01DCDC72.67FF0160]



The circuit included a complete synth structure with ADSR, 2 VCO?s VCA, VCF and MIDI output.

It still works very well after all those years.

But recently I tried to browse my original program listings and HEX files (.S19 file for Motorola)

to see what I?d done in the past? but.. no such files left !! Woohh..

Only some hand written schematics and notes on papers.

BUT I also had a pile of 26 pages of the original .LST file which was the printed results
of the original compiled assembler code that was lost over time..

The assembler compiler I used was IASM11.

Pages like this:



[cid:image002.png at 01DCDC72.67FF0160]



That is what I only had left from my original design..

My goal now was to ?retrieve? my .S19 compiled code from the installed HC811E2

and save it in case something goes wrong with the micro so I could reprogram
another one. But I did not have the appropriate hardware to read the HC..

So I thought.. Why not redo this design with the same schematic
but using a new PIC micro instead ?

After checking the needed amount of I/O pins I found the PIC16F1789
could be a good replacement..



Since the only thing left of my code were the 26 printed pages
I needed to extract the actual text code from these and save
them in 26 separate .TXT files.

I first scanned all the 26 pages and saved them in JPG format.

Then I browsed the web to find any ?On Line OCR? available

and found some.. But the OCR extractions were not good at all
missing or misreading many characters.. !!

So I thought ChatGPT could be a solution in my case..
My first try with this tool.

I went to ChatGPT and asked it to OCR my first JPG code page
which it did very efficiently !



Ok.. I did the same with all the 26 pages.

26 text files saved.

I then ?merged? in order all these pages in one single page of assembler code.



So far ChatGPT had been a good partner for my job..



Next step:

I asked ChatGPT to read my  HC811E2 assembler code file and
create a Microchip XC8 C code for PIC16F1789
giving it a clear description of the original HC11 pins number/function
and the new PIC pins number/function to achieve the same job.



Its reply:

The source code is very large (more than 1000 lines with the complete POT_VAL table),

so to make a clean, reliable and compilable conversion to XC8 for PIC16F1789, you must proceed in structured phases.



This is the correct method ? otherwise you get incorrect or unusable code.

I will therefore continue exactly as in your previous requests, by generating:



Phase 1

PIC16F1789 Full Hardware Configuration:



CONFIG bits

Internal oscillator 32 MHz + PLL

ADC RA0?RA3

USART MIDI 31250 baud on RC6

PORTB outputs

PORTD entries

RC0?RC5 outputs

Timer1

CCP1 / CCP2 replacement TOC2 / TOC3

global variables HC11 ? C



Phase 2

Conversion of structures:



note tables (DO1 ? DO3)

NOTE/PERIOD structure

table POT_VAL[256]

10-bit ADC reading ? conservation of 8 MSB

automatic table lookup



Phase 3

Conversion of routines:



NOON()

TXMIT()

ADC()

JAR()

ADSR()

SAW()

DEBOUNC()

DEADLINE()



Phase 4

Main logic conversion:



CHANNEL()

TEST()

main loop

NOTE ON / NOTE OFF management

scanning complete crankset

final CCP1/CCP2 interrupts



I then refined my request giving it back its code

and asking it to merge all these 4 phases together
in one single .C program.



I did not include here the final code listed by ChatGPT..

I then checked it carefully for all the Ins, OUTs, interrupts, clock speed, TIMERs, etc..

Loaded it in MPLAB X compiler and.. IT WORKED !!!!

I couldn?t believe it..

All this result starting from scanned listing pages !!



That?s all I wanted to share with you..

For my needs here.. No special AI software to buy..

I?m very happy !



And,, sorry for this long email but.. Yeah !



The information contained in this e-mail message is privileged and confidential and is for the exclusive use of the addressee. The person who receives this message and who is not the addressee, one of his employees or an agent entitled to hand it over to the addressee, is informed that he may not use, disclose or reproduce the contents thereof, and is kindly asked to notify the sender and delete the e-mail immediately.
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From tom at electricdruid.net  Tue May  5 16:35:26 2026
From: tom at electricdruid.net (Tom Wiltshire)
Date: Tue, 5 May 2026 15:35:26 +0100
Subject: [sdiy] First exchanges with ChatGPT... program code extract +
 conversion.. AWESOME !!!
In-Reply-To: <CWLP265MB7132BCD778BABCF9F3E17B8ADB3E2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
References: <000001dcdbcc$e6d2ac90$b47805b0$@oricom.ca>
 <AS1PR03MB8287631712B80641FEC6D715943E2@AS1PR03MB8287.eurprd03.prod.outlook.com>
 <001701dcdc93$efecd090$cfc671b0$@oricom.ca>
 <CWLP265MB7132BCD778BABCF9F3E17B8ADB3E2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
Message-ID: <DBE1AF2C-3D2A-4D42-8CAD-F18D44142BA5@electricdruid.net>



> On 5 May 2026, at 14:54, Mike Bryant <mbryant at futurehorizons.com> wrote:
> I think we were all so gobsmacked by it working there was nothing left to say ?

Yep, this exactly! It's pretty amazing that this came off.

Well done, J-P!
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From jpdesroc at oricom.ca  Tue May  5 18:45:47 2026
From: jpdesroc at oricom.ca (jpdesroc at oricom.ca)
Date: Tue, 5 May 2026 12:45:47 -0400
Subject: [sdiy] First exchanges with ChatGPT... program code extract +
 conversion.. AWESOME !!!
In-Reply-To: <DBE1AF2C-3D2A-4D42-8CAD-F18D44142BA5@electricdruid.net>
References: <000001dcdbcc$e6d2ac90$b47805b0$@oricom.ca>
 <AS1PR03MB8287631712B80641FEC6D715943E2@AS1PR03MB8287.eurprd03.prod.outlook.com>
 <001701dcdc93$efecd090$cfc671b0$@oricom.ca>
 <CWLP265MB7132BCD778BABCF9F3E17B8ADB3E2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <DBE1AF2C-3D2A-4D42-8CAD-F18D44142BA5@electricdruid.net>
Message-ID: <002b01dcdcae$a09c4b90$e1d4e2b0$@oricom.ca>

I?m still amazed by how it ended up !

Thanks Tom.

 

De : Tom Wiltshire <tom at electricdruid.net> 
Envoy? : 5 mai 2026 10:35
? : Mike Bryant <mbryant at futurehorizons.com>
Cc : Peter Ullrich <Peter.Ullrich at kapsch.net>; Synth-diy at synth-diy.org; jpdesroc at oricom.ca
Objet : Re: [sdiy] First exchanges with ChatGPT... program code extract + conversion.. AWESOME !!!

 

 





On 5 May 2026, at 14:54, Mike Bryant <mbryant at futurehorizons.com <mailto:mbryant at futurehorizons.com> > wrote:

I think we were all so gobsmacked by it working there was nothing left to say ?

 

Yep, this exactly! It's pretty amazing that this came off.

 

Well done, J-P!

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From sleepy_dog at gmx.de  Tue May  5 20:55:37 2026
From: sleepy_dog at gmx.de (sleepy_dog at gmx.de)
Date: Tue, 5 May 2026 20:55:37 +0200
Subject: [sdiy] First exchanges with ChatGPT... program code extract +
 conversion.. AWESOME !!!
In-Reply-To: <DBE1AF2C-3D2A-4D42-8CAD-F18D44142BA5@electricdruid.net>
References: <000001dcdbcc$e6d2ac90$b47805b0$@oricom.ca>
 <AS1PR03MB8287631712B80641FEC6D715943E2@AS1PR03MB8287.eurprd03.prod.outlook.com>
 <001701dcdc93$efecd090$cfc671b0$@oricom.ca>
 <CWLP265MB7132BCD778BABCF9F3E17B8ADB3E2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <DBE1AF2C-3D2A-4D42-8CAD-F18D44142BA5@electricdruid.net>
Message-ID: <8d3fe6d4-c8b3-1062-7291-6e2def7847ec@gmx.de>


Actually, the described scenario is where I would have expected LLMs to 
likely produce good results. Two available, very comprehensive set of 
rules, and then transforming from one to the other.
Not many more levels above that, except to understand the relatively 
straightforward goal of the user. At least if the two architectures are 
reasonably close in what they can do, instruction wise, w.r.t. the 
subset used by the code to be translated.
Here, one does not expect of the "AI" to have a grand, actual 
understanding of things which it does not have.

On 05.05.2026 16:35, Tom Wiltshire wrote:
>
>
>> On 5 May 2026, at 14:54, Mike Bryant <mbryant at futurehorizons.com> wrote:
>> I think we were all so gobsmacked by it working there was nothing 
>> left to say ?
>
> Yep, this exactly! It's pretty amazing that this came off.
>
> Well done, J-P!
>
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to:Synth-diy at synth-diy.org
> View archive at:https://synth-diy.org/pipermail/synth-diy/
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From btremblay at me.com  Tue May  5 21:30:06 2026
From: btremblay at me.com (Benjamin Tremblay)
Date: Tue, 5 May 2026 15:30:06 -0400
Subject: [sdiy] First exchanges with ChatGPT... program code extract +
 conversion.. AWESOME !!!
In-Reply-To: <8d3fe6d4-c8b3-1062-7291-6e2def7847ec@gmx.de>
References: <8d3fe6d4-c8b3-1062-7291-6e2def7847ec@gmx.de>
Message-ID: <18829422-E546-4E52-996E-6418A58CBBE3@me.com>

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From elmacaco at hotmail.com  Wed May  6 00:53:11 2026
From: elmacaco at hotmail.com (el macaco)
Date: Tue, 5 May 2026 22:53:11 +0000
Subject: [sdiy] First exchanges with ChatGPT... program code extract +
 conversion.. AWESOME !!!
In-Reply-To: <18829422-E546-4E52-996E-6418A58CBBE3@me.com>
References: <8d3fe6d4-c8b3-1062-7291-6e2def7847ec@gmx.de>
 <18829422-E546-4E52-996E-6418A58CBBE3@me.com>
Message-ID: <SJ2P222MB08546D7633EC7ABE361F67D7C43E2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>

Yes this is a great result! Had me thinking if this could take an OS for an old synth or sampler and optimize or improve it.  Still would help to have it in the hands of someone who understands the code and could catch errors.

Congrats!



Get Outlook for iOS<https://aka.ms/o0ukef>
________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Benjamin Tremblay via Synth-diy <synth-diy at synth-diy.org>
Sent: Tuesday, May 5, 2026 2:30:06 PM
To: sleepy_dog at gmx.de <sleepy_dog at gmx.de>
Cc: Synth-diy at synth-diy.org <Synth-diy at synth-diy.org>
Subject: Re: [sdiy] First exchanges with ChatGPT... program code extract + conversion.. AWESOME !!!

Yes. It?s for translating things.
Benjamin Tremblay

On May 5, 2026, at 3:07?PM, Steve via Synth-diy <synth-diy at synth-diy.org> wrote:

?

Actually, the described scenario is where I would have expected LLMs to likely produce good results. Two available, very comprehensive set of rules, and then transforming from one to the other.
Not many more levels above that, except to understand the relatively straightforward goal of the user. At least if the two architectures are reasonably close in what they can do, instruction wise, w.r.t. the subset used by the code to be translated.
Here, one does not expect of the "AI" to have a grand, actual understanding of things which it does not have.

On 05.05.2026 16:35, Tom Wiltshire wrote:


On 5 May 2026, at 14:54, Mike Bryant <mbryant at futurehorizons.com<mailto:mbryant at futurehorizons.com>> wrote:
I think we were all so gobsmacked by it working there was nothing left to say ?

Yep, this exactly! It's pretty amazing that this came off.

Well done, J-P!



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From eric at ericframpton.com  Wed May  6 02:16:59 2026
From: eric at ericframpton.com (Eric Frampton)
Date: Wed, 6 May 2026 00:16:59 +0000
Subject: [sdiy] First exchanges with ChatGPT... program code extract +
 conversion.. AWESOME !!!
In-Reply-To: <SJ2P222MB08546D7633EC7ABE361F67D7C43E2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
References: <8d3fe6d4-c8b3-1062-7291-6e2def7847ec@gmx.de>
 <18829422-E546-4E52-996E-6418A58CBBE3@me.com>
 <SJ2P222MB08546D7633EC7ABE361F67D7C43E2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
Message-ID: <CC810EB5-EDF4-46A0-919D-63FEFBB66F5E@ericframpton.com>

I?m actually working on that very thing for a particular favorite old synth of mine. Stay tuned.

On May 5, 2026, at 6:53?PM, el macaco via Synth-diy <synth-diy at synth-diy.org> wrote:

Yes this is a great result! Had me thinking if this could take an OS for an old synth or sampler and optimize or improve it.  Still would help to have it in the hands of someone who understands the code and could catch errors.

Congrats!



Get Outlook for iOS<https://aka.ms/o0ukef>
________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Benjamin Tremblay via Synth-diy <synth-diy at synth-diy.org>
Sent: Tuesday, May 5, 2026 2:30:06 PM
To: sleepy_dog at gmx.de <sleepy_dog at gmx.de>
Cc: Synth-diy at synth-diy.org <Synth-diy at synth-diy.org>
Subject: Re: [sdiy] First exchanges with ChatGPT... program code extract + conversion.. AWESOME !!!

Yes. It?s for translating things.
Benjamin Tremblay

On May 5, 2026, at 3:07?PM, Steve via Synth-diy <synth-diy at synth-diy.org> wrote:

?

Actually, the described scenario is where I would have expected LLMs to likely produce good results. Two available, very comprehensive set of rules, and then transforming from one to the other.
Not many more levels above that, except to understand the relatively straightforward goal of the user. At least if the two architectures are reasonably close in what they can do, instruction wise, w.r.t. the subset used by the code to be translated.
Here, one does not expect of the "AI" to have a grand, actual understanding of things which it does not have.

On 05.05.2026 16:35, Tom Wiltshire wrote:


On 5 May 2026, at 14:54, Mike Bryant <mbryant at futurehorizons.com<mailto:mbryant at futurehorizons.com>> wrote:
I think we were all so gobsmacked by it working there was nothing left to say ?

Yep, this exactly! It's pretty amazing that this came off.

Well done, J-P!



________________________________________________________
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From elmacaco at hotmail.com  Wed May  6 06:17:35 2026
From: elmacaco at hotmail.com (el macaco)
Date: Wed, 6 May 2026 04:17:35 +0000
Subject: [sdiy] First exchanges with ChatGPT... program code extract +
 conversion.. AWESOME !!!
In-Reply-To: <CC810EB5-EDF4-46A0-919D-63FEFBB66F5E@ericframpton.com>
References: <8d3fe6d4-c8b3-1062-7291-6e2def7847ec@gmx.de>
 <18829422-E546-4E52-996E-6418A58CBBE3@me.com>
 <SJ2P222MB08546D7633EC7ABE361F67D7C43E2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
 <CC810EB5-EDF4-46A0-919D-63FEFBB66F5E@ericframpton.com>
Message-ID: <LV8P222MB086165079AFCDD4DB71F6B27C43F2@LV8P222MB0861.NAMP222.PROD.OUTLOOK.COM>

Excellent Eric!!

That would be a great use of these tools!  Would love to see this rescue the code for the E-mu emax (even Dave Rossum doesn?t have it)  oberheim xpander, although they are great as is, I wonder if AI can optimize beyond what was done.

I saw Colin Fraser?s updates to the MKS-80 and JP-6,
Granted that has a hardware element, but Jupiter 8 envelope speeds and resolution on those plus other filter modes and more really opens up horizons for a lot of great developments!

Please keep us posted when you?re ready to share!

Ed


________________________________
From: Eric Frampton <eric at ericframpton.com>
Sent: Tuesday, May 5, 2026 7:16:59 PM
To: el macaco <elmacaco at hotmail.com>
Cc: SDIY <Synth-diy at synth-diy.org>
Subject: Re: [sdiy] First exchanges with ChatGPT... program code extract + conversion.. AWESOME !!!

I?m actually working on that very thing for a particular favorite old synth of mine. Stay tuned.

On May 5, 2026, at 6:53?PM, el macaco via Synth-diy <synth-diy at synth-diy.org> wrote:

Yes this is a great result! Had me thinking if this could take an OS for an old synth or sampler and optimize or improve it.  Still would help to have it in the hands of someone who understands the code and could catch errors.

Congrats!



Get Outlook for iOS<https://aka.ms/o0ukef>
________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Benjamin Tremblay via Synth-diy <synth-diy at synth-diy.org>
Sent: Tuesday, May 5, 2026 2:30:06 PM
To: sleepy_dog at gmx.de <sleepy_dog at gmx.de>
Cc: Synth-diy at synth-diy.org <Synth-diy at synth-diy.org>
Subject: Re: [sdiy] First exchanges with ChatGPT... program code extract + conversion.. AWESOME !!!

Yes. It?s for translating things.
Benjamin Tremblay

On May 5, 2026, at 3:07?PM, Steve via Synth-diy <synth-diy at synth-diy.org> wrote:

?

Actually, the described scenario is where I would have expected LLMs to likely produce good results. Two available, very comprehensive set of rules, and then transforming from one to the other.
Not many more levels above that, except to understand the relatively straightforward goal of the user. At least if the two architectures are reasonably close in what they can do, instruction wise, w.r.t. the subset used by the code to be translated.
Here, one does not expect of the "AI" to have a grand, actual understanding of things which it does not have.

On 05.05.2026 16:35, Tom Wiltshire wrote:


On 5 May 2026, at 14:54, Mike Bryant <mbryant at futurehorizons.com<mailto:mbryant at futurehorizons.com>> wrote:
I think we were all so gobsmacked by it working there was nothing left to say ?

Yep, this exactly! It's pretty amazing that this came off.

Well done, J-P!



________________________________________________________
This is the Synth-diy mailing list
Submit email to: Synth-diy at synth-diy.org<mailto:Synth-diy at synth-diy.org>
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From mbryant at futurehorizons.com  Wed May  6 11:18:08 2026
From: mbryant at futurehorizons.com (Mike Bryant)
Date: Wed, 6 May 2026 09:18:08 +0000
Subject: [sdiy] First exchanges with ChatGPT... program code extract +
 conversion.. AWESOME !!!
In-Reply-To: <CC810EB5-EDF4-46A0-919D-63FEFBB66F5E@ericframpton.com>
References: <8d3fe6d4-c8b3-1062-7291-6e2def7847ec@gmx.de>
 <18829422-E546-4E52-996E-6418A58CBBE3@me.com>
 <SJ2P222MB08546D7633EC7ABE361F67D7C43E2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
 <CC810EB5-EDF4-46A0-919D-63FEFBB66F5E@ericframpton.com>
Message-ID: <CWLP265MB7132A98FC7B498852479E80EDB3F2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>

I wonder if you gave it photos of the top and bottom of a 2 layer loaded PCB whether it could create a schematic ? ?
________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Eric Frampton <eric at ericframpton.com>
Sent: 06 May 2026 01:16
To: el macaco <elmacaco at hotmail.com>
Cc: SDIY <Synth-diy at synth-diy.org>
Subject: Re: [sdiy] First exchanges with ChatGPT... program code extract + conversion.. AWESOME !!!

I?m actually working on that very thing for a particular favorite old synth of mine. Stay tuned.

On May 5, 2026, at 6:53?PM, el macaco via Synth-diy <synth-diy at synth-diy.org> wrote:

Yes this is a great result! Had me thinking if this could take an OS for an old synth or sampler and optimize or improve it.  Still would help to have it in the hands of someone who understands the code and could catch errors.

Congrats!



Get Outlook for iOS<https://aka.ms/o0ukef>
________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Benjamin Tremblay via Synth-diy <synth-diy at synth-diy.org>
Sent: Tuesday, May 5, 2026 2:30:06 PM
To: sleepy_dog at gmx.de <sleepy_dog at gmx.de>
Cc: Synth-diy at synth-diy.org <Synth-diy at synth-diy.org>
Subject: Re: [sdiy] First exchanges with ChatGPT... program code extract + conversion.. AWESOME !!!

Yes. It?s for translating things.
Benjamin Tremblay

On May 5, 2026, at 3:07?PM, Steve via Synth-diy <synth-diy at synth-diy.org> wrote:

?

Actually, the described scenario is where I would have expected LLMs to likely produce good results. Two available, very comprehensive set of rules, and then transforming from one to the other.
Not many more levels above that, except to understand the relatively straightforward goal of the user. At least if the two architectures are reasonably close in what they can do, instruction wise, w.r.t. the subset used by the code to be translated.
Here, one does not expect of the "AI" to have a grand, actual understanding of things which it does not have.

On 05.05.2026 16:35, Tom Wiltshire wrote:


On 5 May 2026, at 14:54, Mike Bryant <mbryant at futurehorizons.com<mailto:mbryant at futurehorizons.com>> wrote:
I think we were all so gobsmacked by it working there was nothing left to say ?

Yep, this exactly! It's pretty amazing that this came off.

Well done, J-P!



________________________________________________________
This is the Synth-diy mailing list
Submit email to: Synth-diy at synth-diy.org<mailto:Synth-diy at synth-diy.org>
View archive at: https://synth-diy.org/pipermail/synth-diy/
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From robkam at gmx.com  Wed May  6 14:34:58 2026
From: robkam at gmx.com (Rob Kam)
Date: Wed, 6 May 2026 13:34:58 +0100
Subject: [sdiy] First exchanges with ChatGPT... program code extract +
 conversion.. AWESOME !!!
In-Reply-To: <CWLP265MB7132A98FC7B498852479E80EDB3F2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
References: <8d3fe6d4-c8b3-1062-7291-6e2def7847ec@gmx.de>
 <18829422-E546-4E52-996E-6418A58CBBE3@me.com>
 <SJ2P222MB08546D7633EC7ABE361F67D7C43E2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
 <CC810EB5-EDF4-46A0-919D-63FEFBB66F5E@ericframpton.com>
 <CWLP265MB7132A98FC7B498852479E80EDB3F2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
Message-ID: <1c3518d6-7167-45a9-8743-c2a13907f1f5@gmx.com>

Quite probably, if you also gave it the inputs, outputs, and BOM.

On 06/05/2026 10:18, Mike Bryant wrote:
> I wonder if you gave it photos of the top and bottom of a 2 layer 
> loaded PCB whether it could create a schematic ? ?
> ------------------------------------------------------------------------
> *From:* Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Eric 
> Frampton <eric at ericframpton.com>
> *Sent:* 06 May 2026 01:16
> *To:* el macaco <elmacaco at hotmail.com>
> *Cc:* SDIY <Synth-diy at synth-diy.org>
> *Subject:* Re: [sdiy] First exchanges with ChatGPT... program code 
> extract + conversion.. AWESOME !!!
> I?m actually working on that very thing for a particular favorite old 
> synth of mine. Stay tuned.
>
>> On May 5, 2026, at 6:53?PM, el macaco via Synth-diy 
>> <synth-diy at synth-diy.org> wrote:
>>
>> Yes this is a great result! Had me thinking if this could take an OS 
>> for an old synth or sampler and optimize or improve it. ?Still would 
>> help to have it in the hands of someone who understands the code and 
>> could catch errors.
>>
>> Congrats!
>>
>>
>>
>> Get Outlook for iOS <https://aka.ms/o0ukef>
>> ------------------------------------------------------------------------
>> *From:* Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of 
>> Benjamin Tremblay via Synth-diy <synth-diy at synth-diy.org>
>> *Sent:* Tuesday, May 5, 2026 2:30:06 PM
>> *To:* sleepy_dog at gmx.de <sleepy_dog at gmx.de>
>> *Cc:* Synth-diy at synth-diy.org <Synth-diy at synth-diy.org>
>> *Subject:* Re: [sdiy] First exchanges with ChatGPT... program code 
>> extract + conversion.. AWESOME !!!
>> Yes. It?s for translating things.
>> Benjamin Tremblay
>>
>>> On May 5, 2026, at 3:07?PM, Steve via Synth-diy 
>>> <synth-diy at synth-diy.org> wrote:
>>>
>>> ?
>>>
>>> Actually, the described scenario is where I would have expected LLMs 
>>> to likely produce good results. Two available, very comprehensive 
>>> set of rules, and then transforming from one to the other.
>>> Not many more levels above that, except to understand the relatively 
>>> straightforward goal of the user. At least if the two architectures 
>>> are reasonably close in what they can do, instruction wise, w.r.t. 
>>> the subset used by the code to be translated.
>>> Here, one does not expect of the "AI" to have a grand, actual 
>>> understanding of things which it does not have.
>>>
>>> On 05.05.2026 16:35, Tom Wiltshire wrote:
>>>>
>>>>
>>>>> On 5 May 2026, at 14:54, Mike Bryant <mbryant at futurehorizons.com 
>>>>> <mailto:mbryant at futurehorizons.com>> wrote:
>>>>> I think we were all so gobsmacked by it working there was nothing 
>>>>> left to say ?
>>>>
>>>> Yep, this exactly! It's pretty amazing that this came off.
>>>>
>>>> Well done, J-P!
>>>>
>>>> ________________________________________________________
>>>> This is the Synth-diy mailing list
>>>> Submit email to:Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
>>>> View archive at:https://synth-diy.org/pipermail/synth-diy/ <https://synth-diy.org/pipermail/synth-diy/>
>>>> Check your settings at:https://synth-diy.org/mailman/listinfo/synth-diy <https://synth-diy.org/mailman/listinfo/synth-diy>
>>>> Selling or trading? Usemarketplace at synth-diy.org <mailto:marketplace at synth-diy.org>
>>>
>>>
>>> ________________________________________________________
>>> This is the Synth-diy mailing list
>>> Submit email to: Synth-diy at synth-diy.org
>>> View archive at: https://synth-diy.org/pipermail/synth-diy/
>>> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
>>> Selling or trading? Use marketplace at synth-diy.org
>> ________________________________________________________
>> This is the Synth-diy mailing list
>> Submit email to: Synth-diy at synth-diy.org
>> View archive at: https://synth-diy.org/pipermail/synth-diy/
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>> ________________________________________________________
>> This is the Synth-diy mailing list
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>> Selling or trading? Use marketplace at synth-diy.org
>
>
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to:Synth-diy at synth-diy.org
> View archive at:https://synth-diy.org/pipermail/synth-diy/
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From tensiontype at hotmail.com  Wed May  6 17:37:32 2026
From: tensiontype at hotmail.com (Sean Ellis)
Date: Wed, 6 May 2026 15:37:32 +0000
Subject: [sdiy] First exchanges with ChatGPT... program code extract +
 conversion.. AWESOME !!!
In-Reply-To: <1c3518d6-7167-45a9-8743-c2a13907f1f5@gmx.com>
References: <8d3fe6d4-c8b3-1062-7291-6e2def7847ec@gmx.de>
 <18829422-E546-4E52-996E-6418A58CBBE3@me.com>
 <SJ2P222MB08546D7633EC7ABE361F67D7C43E2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
 <CC810EB5-EDF4-46A0-919D-63FEFBB66F5E@ericframpton.com>
 <CWLP265MB7132A98FC7B498852479E80EDB3F2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <1c3518d6-7167-45a9-8743-c2a13907f1f5@gmx.com>
Message-ID: <KL1PR02MB6663238C9F42EEA218A36A80B33F2@KL1PR02MB6663.apcprd02.prod.outlook.com>

You can feed kicad to claude and get layout suggestions so I dont doubt it could trace a circuit.

________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Rob Kam via Synth-diy <synth-diy at synth-diy.org>
Sent: Wednesday, 6 May 2026 2:34 PM
Cc: SDIY <Synth-diy at synth-diy.org>
Subject: Re: [sdiy] First exchanges with ChatGPT... program code extract + conversion.. AWESOME !!!


Quite probably, if you also gave it the inputs, outputs, and BOM.


On 06/05/2026 10:18, Mike Bryant wrote:
I wonder if you gave it photos of the top and bottom of a 2 layer loaded PCB whether it could create a schematic ? ?
________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org><mailto:synth-diy-bounces at synth-diy.org> on behalf of Eric Frampton <eric at ericframpton.com><mailto:eric at ericframpton.com>
Sent: 06 May 2026 01:16
To: el macaco <elmacaco at hotmail.com><mailto:elmacaco at hotmail.com>
Cc: SDIY <Synth-diy at synth-diy.org><mailto:Synth-diy at synth-diy.org>
Subject: Re: [sdiy] First exchanges with ChatGPT... program code extract + conversion.. AWESOME !!!

I?m actually working on that very thing for a particular favorite old synth of mine. Stay tuned.

On May 5, 2026, at 6:53?PM, el macaco via Synth-diy <synth-diy at synth-diy.org><mailto:synth-diy at synth-diy.org> wrote:

Yes this is a great result! Had me thinking if this could take an OS for an old synth or sampler and optimize or improve it.  Still would help to have it in the hands of someone who understands the code and could catch errors.

Congrats!



Get Outlook for iOS<https://aka.ms/o0ukef>
________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org><mailto:synth-diy-bounces at synth-diy.org> on behalf of Benjamin Tremblay via Synth-diy <synth-diy at synth-diy.org><mailto:synth-diy at synth-diy.org>
Sent: Tuesday, May 5, 2026 2:30:06 PM
To: sleepy_dog at gmx.de<mailto:sleepy_dog at gmx.de> <sleepy_dog at gmx.de><mailto:sleepy_dog at gmx.de>
Cc: Synth-diy at synth-diy.org<mailto:Synth-diy at synth-diy.org> <Synth-diy at synth-diy.org><mailto:Synth-diy at synth-diy.org>
Subject: Re: [sdiy] First exchanges with ChatGPT... program code extract + conversion.. AWESOME !!!

Yes. It?s for translating things.
Benjamin Tremblay

On May 5, 2026, at 3:07?PM, Steve via Synth-diy <synth-diy at synth-diy.org><mailto:synth-diy at synth-diy.org> wrote:

?

Actually, the described scenario is where I would have expected LLMs to likely produce good results. Two available, very comprehensive set of rules, and then transforming from one to the other.
Not many more levels above that, except to understand the relatively straightforward goal of the user. At least if the two architectures are reasonably close in what they can do, instruction wise, w.r.t. the subset used by the code to be translated.
Here, one does not expect of the "AI" to have a grand, actual understanding of things which it does not have.

On 05.05.2026 16:35, Tom Wiltshire wrote:


On 5 May 2026, at 14:54, Mike Bryant <mbryant at futurehorizons.com<mailto:mbryant at futurehorizons.com>> wrote:
I think we were all so gobsmacked by it working there was nothing left to say ?

Yep, this exactly! It's pretty amazing that this came off.

Well done, J-P!



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From sines_list at scale.la  Wed May  6 18:04:33 2026
From: sines_list at scale.la (Todd Sines)
Date: Wed, 6 May 2026 12:04:33 -0400
Subject: [sdiy] First exchanges with ChatGPT... program code extract +
 conversion.. AWESOME !!!
In-Reply-To: <KL1PR02MB6663238C9F42EEA218A36A80B33F2@KL1PR02MB6663.apcprd02.prod.outlook.com>
References: <8d3fe6d4-c8b3-1062-7291-6e2def7847ec@gmx.de>
 <18829422-E546-4E52-996E-6418A58CBBE3@me.com>
 <SJ2P222MB08546D7633EC7ABE361F67D7C43E2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
 <CC810EB5-EDF4-46A0-919D-63FEFBB66F5E@ericframpton.com>
 <CWLP265MB7132A98FC7B498852479E80EDB3F2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <1c3518d6-7167-45a9-8743-c2a13907f1f5@gmx.com>
 <KL1PR02MB6663238C9F42EEA218A36A80B33F2@KL1PR02MB6663.apcprd02.prod.outlook.com>
Message-ID: <C609B059-C63C-42C3-96D4-5B3C2DD47234@scale.la>

I have tried it with Claude CLI. It weirdly would add all of the symbols, but not make all (or barely any) connections in Kicad. 

I will try again with a Claude MCP <?> Kicad (there are several, some free, some not); hopefully it will yield better results.
https://mcpmarket.com/es/tools/skills/kicad-electronics-design

I got a pretty successful looking rigid body simulation of 100,000 grains of sand inside an hourglass using Claude, MCP, Python, and Blender just by providing it reference images. After a lot of steering, has figured out how to attack my project; like a first date a metal concert, after a lot of head-banging and hand holding, I got a lot further than I would have on my own.

If it can handle that, maybe it can handle your needs as well.

Todd

> On May 6, 2026, at 11:37?AM, Sean Ellis via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> You can feed kicad to claude and get layout suggestions so I dont doubt it could trace a circuit. 
> 
> From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Rob Kam via Synth-diy <synth-diy at synth-diy.org>
> Sent: Wednesday, 6 May 2026 2:34 PM
> Cc: SDIY <Synth-diy at synth-diy.org>
> Subject: Re: [sdiy] First exchanges with ChatGPT... program code extract + conversion.. AWESOME !!!
>  
> Quite probably, if you also gave it the inputs, outputs, and BOM.
> 
> On 06/05/2026 10:18, Mike Bryant wrote:
> I wonder if you gave it photos of the top and bottom of a 2 layer loaded PCB whether it could create a schematic ? ?
> From: Synth-diy <synth-diy-bounces at synth-diy.org> <mailto:synth-diy-bounces at synth-diy.org> on behalf of Eric Frampton <eric at ericframpton.com> <mailto:eric at ericframpton.com>
> Sent: 06 May 2026 01:16
> To: el macaco <elmacaco at hotmail.com> <mailto:elmacaco at hotmail.com>
> Cc: SDIY <Synth-diy at synth-diy.org> <mailto:Synth-diy at synth-diy.org>
> Subject: Re: [sdiy] First exchanges with ChatGPT... program code extract + conversion.. AWESOME !!!
>  
> I?m actually working on that very thing for a particular favorite old synth of mine. Stay tuned.
> 
> On May 5, 2026, at 6:53?PM, el macaco via Synth-diy <synth-diy at synth-diy.org> <mailto:synth-diy at synth-diy.org> wrote:
> 
> Yes this is a great result! Had me thinking if this could take an OS for an old synth or sampler and optimize or improve it.  Still would help to have it in the hands of someone who understands the code and could catch errors.
> 
> Congrats! 
> 
> 
> 
> Get Outlook for iOS <https://aka.ms/o0ukef>
> From: Synth-diy <synth-diy-bounces at synth-diy.org> <mailto:synth-diy-bounces at synth-diy.org> on behalf of Benjamin Tremblay via Synth-diy <synth-diy at synth-diy.org> <mailto:synth-diy at synth-diy.org>
> Sent: Tuesday, May 5, 2026 2:30:06 PM
> To: sleepy_dog at gmx.de <mailto:sleepy_dog at gmx.de> <sleepy_dog at gmx.de> <mailto:sleepy_dog at gmx.de>
> Cc: Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org> <Synth-diy at synth-diy.org> <mailto:Synth-diy at synth-diy.org>
> Subject: Re: [sdiy] First exchanges with ChatGPT... program code extract + conversion.. AWESOME !!!
>  
> Yes. It?s for translating things.
> Benjamin Tremblay
> 
> On May 5, 2026, at 3:07?PM, Steve via Synth-diy <synth-diy at synth-diy.org> <mailto:synth-diy at synth-diy.org> wrote:
> 
> ?
> 
> Actually, the described scenario is where I would have expected LLMs to likely produce good results. Two available, very comprehensive set of rules, and then transforming from one to the other.
> Not many more levels above that, except to understand the relatively straightforward goal of the user. At least if the two architectures are reasonably close in what they can do, instruction wise, w.r.t. the subset used by the code to be translated.
> Here, one does not expect of the "AI" to have a grand, actual understanding of things which it does not have.
> 
> On 05.05.2026 16:35, Tom Wiltshire wrote:
> 
> 
> On 5 May 2026, at 14:54, Mike Bryant <mbryant at futurehorizons.com <mailto:mbryant at futurehorizons.com>> wrote:
> I think we were all so gobsmacked by it working there was nothing left to say ?
> 
> Yep, this exactly! It's pretty amazing that this came off.
> 
> Well done, J-P!
> 
> 
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
> View archive at: https://synth-diy.org/pipermail/synth-diy/
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> 
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
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> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
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> Selling or trading? Use marketplace at synth-diy.org <mailto:marketplace at synth-diy.org>
> 
> 
> 
> ________________________________________________________
> This is the Synth-diy mailing list
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From n.dinapoli at ymail.com  Thu May  7 02:13:50 2026
From: n.dinapoli at ymail.com (=?UTF-8?Q?Nicol=C3=A1s_Dinapoli_Fari=C3=B1a?=)
Date: Thu, 7 May 2026 00:13:50 +0000 (UTC)
Subject: [sdiy] First exchanges with ChatGPT... program code extract +
 conversion.. AWESOME !!!
In-Reply-To: <C609B059-C63C-42C3-96D4-5B3C2DD47234@scale.la>
References: <8d3fe6d4-c8b3-1062-7291-6e2def7847ec@gmx.de>
 <18829422-E546-4E52-996E-6418A58CBBE3@me.com>
 <SJ2P222MB08546D7633EC7ABE361F67D7C43E2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
 <CC810EB5-EDF4-46A0-919D-63FEFBB66F5E@ericframpton.com>
 <CWLP265MB7132A98FC7B498852479E80EDB3F2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <1c3518d6-7167-45a9-8743-c2a13907f1f5@gmx.com>
 <KL1PR02MB6663238C9F42EEA218A36A80B33F2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <C609B059-C63C-42C3-96D4-5B3C2DD47234@scale.la>
Message-ID: <695987411.4638817.1778112830525@mail.yahoo.com>

Outstanding.On the thread about Scott Lee passing away, I wrote about porting the old PAiA software to something sinple like arduino. I then remembered posting about it, maybe here, maybe on electro-music.I suppose now this is the way to go about it.
 
 
  El mi?., 6 de may. de 2026 a la(s) 13:05, Todd Sines via Synth-diy<synth-diy at synth-diy.org> escribi?:   I have tried it with Claude CLI. It weirdly would add all of the symbols, but not make all (or barely any) connections in Kicad.?
I will try again with a Claude MCP <?> Kicad (there are several, some free, some not); hopefully it will yield better results.https://mcpmarket.com/es/tools/skills/kicad-electronics-design
I got a pretty successful looking rigid body simulation of 100,000 grains of sand inside an hourglass using Claude, MCP, Python, and Blender just by providing it reference images. After a lot of steering, has figured out how to attack my project; like a first date a metal concert, after a lot of head-banging and hand holding, I got a lot further than I would have on my own.
If it can handle that, maybe it can handle your needs as well.
Todd


On May 6, 2026, at 11:37?AM, Sean Ellis via Synth-diy <synth-diy at synth-diy.org> wrote:
You can feed kicad to claude and get layout suggestions so I dont doubt it could trace a circuit.?
From:?Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Rob Kam via Synth-diy <synth-diy at synth-diy.org>
Sent:?Wednesday, 6 May 2026 2:34 PM
Cc:?SDIY <Synth-diy at synth-diy.org>
Subject:?Re: [sdiy] First exchanges with ChatGPT... program code extract + conversion.. AWESOME !!!?Quite probably, if you also gave it the inputs, outputs, and BOM.

On 06/05/2026 10:18, Mike Bryant wrote:
I wonder if you gave it photos of the top and bottom of a 2 layer loaded PCB whether it could create a schematic ? ?From:?Synth-diy?<synth-diy-bounces at synth-diy.org>?on behalf of Eric Frampton?<eric at ericframpton.com>
Sent:?06 May 2026 01:16
To:?el macaco?<elmacaco at hotmail.com>
Cc:?SDIY?<Synth-diy at synth-diy.org>
Subject:?Re: [sdiy] First exchanges with ChatGPT... program code extract + conversion.. AWESOME !!!?I?m actually working on that very thing for a particular favorite old synth of mine. Stay tuned.

On May 5, 2026, at 6:53?PM, el macaco via Synth-diy?<synth-diy at synth-diy.org>?wrote:
Yes this is a great result! Had me thinking if this could take an OS for an old synth or sampler and optimize or improve it. ?Still would help to have it in the hands of someone who understands the code and could catch errors.
Congrats!?


Get?Outlook for iOSFrom:?Synth-diy?<synth-diy-bounces at synth-diy.org>?on behalf of Benjamin Tremblay via Synth-diy?<synth-diy at synth-diy.org>
Sent:?Tuesday, May 5, 2026 2:30:06 PM
To:?sleepy_dog at gmx.de?<sleepy_dog at gmx.de>
Cc:?Synth-diy at synth-diy.org?<Synth-diy at synth-diy.org>
Subject:?Re: [sdiy] First exchanges with ChatGPT... program code extract + conversion.. AWESOME !!!?Yes. It?s for translating things.Benjamin Tremblay

On May 5, 2026, at 3:07?PM, Steve via Synth-diy?<synth-diy at synth-diy.org>?wrote:



?
Actually, the described scenario is where I would have expected LLMs to likely produce good results. Two available, very comprehensive set of rules, and then transforming from one to the other.
Not many more levels above that, except to understand the relatively straightforward goal of the user. At least if the two architectures are reasonably close in what they can do, instruction wise, w.r.t. the subset used by the code to be translated.
Here, one does not expect of the "AI" to have a grand, actual understanding of things which it does not have.
On 05.05.2026 16:35, Tom Wiltshire wrote:



On 5 May 2026, at 14:54, Mike Bryant <mbryant at futurehorizons.com> wrote:I think we were all so gobsmacked by it working there was nothing left to say ?

Yep, this exactly! It's pretty amazing that this came off.
Well done, J-P!
________________________________________________________This is the Synth-diy mailing listSubmit email to: Synth-diy at synth-diy.orgView archive at: https://synth-diy.org/pipermail/synth-diy/Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diySelling or trading? Use marketplace at synth-diy.org

________________________________________________________
This is the Synth-diy mailing list
Submit email to:?Synth-diy at synth-diy.org
View archive at:?https://synth-diy.org/pipermail/synth-diy/
Check your settings at:?https://synth-diy.org/mailman/listinfo/synth-diy
Selling or trading? Use?marketplace at synth-diy.org
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Submit email to:?Synth-diy at synth-diy.org
View archive at:?https://synth-diy.org/pipermail/synth-diy/
Check your settings at:?https://synth-diy.org/mailman/listinfo/synth-diy
Selling or trading? Use?marketplace at synth-diy.org________________________________________________________
This is the Synth-diy mailing list
Submit email to:?Synth-diy at synth-diy.org
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________________________________________________________This is the Synth-diy mailing listSubmit email to: Synth-diy at synth-diy.orgView archive at: https://synth-diy.org/pipermail/synth-diy/Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diySelling or trading? Use marketplace at synth-diy.org
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From brothertheo2014 at gmail.com  Thu May  7 05:10:34 2026
From: brothertheo2014 at gmail.com (Brother Theo)
Date: Wed, 6 May 2026 23:10:34 -0400
Subject: [sdiy] First exchanges with ChatGPT... program code extract +
 conversion.. AWESOME !!!
In-Reply-To: <695987411.4638817.1778112830525@mail.yahoo.com>
References: <8d3fe6d4-c8b3-1062-7291-6e2def7847ec@gmx.de>
 <18829422-E546-4E52-996E-6418A58CBBE3@me.com>
 <SJ2P222MB08546D7633EC7ABE361F67D7C43E2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
 <CC810EB5-EDF4-46A0-919D-63FEFBB66F5E@ericframpton.com>
 <CWLP265MB7132A98FC7B498852479E80EDB3F2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <1c3518d6-7167-45a9-8743-c2a13907f1f5@gmx.com>
 <KL1PR02MB6663238C9F42EEA218A36A80B33F2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <C609B059-C63C-42C3-96D4-5B3C2DD47234@scale.la>
 <695987411.4638817.1778112830525@mail.yahoo.com>
Message-ID: <CA+K2+DLMpwX-rMWOvMSCmSyA352xGTrDCJV8N3iUSS7h67_0uQ@mail.gmail.com>

I had Claude rewrite Pink Tunes from 6502 assembly to C. It did it no
problem.

--tr

On Wed, May 6, 2026 at 8:16?PM Nicol?s Dinapoli Fari?a via Synth-diy <
synth-diy at synth-diy.org> wrote:

> Outstanding.
> On the thread about Scott Lee passing away, I wrote about porting the old
> PAiA software to something sinple like arduino. I then remembered posting
> about it, maybe here, maybe on electro-music.
> I suppose now this is the way to go about it.
>
>
> El mi?., 6 de may. de 2026 a la(s) 13:05, Todd Sines via Synth-diy
> <synth-diy at synth-diy.org> escribi?:
> I have tried it with Claude CLI. It weirdly would add all of the symbols,
> but not make all (or barely any) connections in Kicad.
>
> I will try again with a Claude MCP <?> Kicad (there are several, some
> free, some not); hopefully it will yield better results.
> https://mcpmarket.com/es/tools/skills/kicad-electronics-design
>
> I got a pretty successful looking rigid body simulation of 100,000 grains
> of sand inside an hourglass using Claude, MCP, Python, and Blender just by
> providing it reference images. After a lot of steering, has figured out how
> to attack my project; like a first date a metal concert, after a lot of
> head-banging and hand holding, I got a lot further than I would have on my
> own.
>
> If it can handle that, maybe it can handle your needs as well.
>
> Todd
>
> On May 6, 2026, at 11:37?AM, Sean Ellis via Synth-diy <
> synth-diy at synth-diy.org> wrote:
>
> You can feed kicad to claude and get layout suggestions so I dont doubt it
> could trace a circuit.
>
> ------------------------------
> *From:* Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Rob Kam
> via Synth-diy <synth-diy at synth-diy.org>
> *Sent:* Wednesday, 6 May 2026 2:34 PM
> *Cc:* SDIY <Synth-diy at synth-diy.org>
> *Subject:* Re: [sdiy] First exchanges with ChatGPT... program code
> extract + conversion.. AWESOME !!!
>
> Quite probably, if you also gave it the inputs, outputs, and BOM.
>
> On 06/05/2026 10:18, Mike Bryant wrote:
>
> I wonder if you gave it photos of the top and bottom of a 2 layer loaded
> PCB whether it could create a schematic ? ?
> ------------------------------
> *From:* Synth-diy <synth-diy-bounces at synth-diy.org>
> <synth-diy-bounces at synth-diy.org> on behalf of Eric Frampton
> <eric at ericframpton.com> <eric at ericframpton.com>
> *Sent:* 06 May 2026 01:16
> *To:* el macaco <elmacaco at hotmail.com> <elmacaco at hotmail.com>
> *Cc:* SDIY <Synth-diy at synth-diy.org> <Synth-diy at synth-diy.org>
> *Subject:* Re: [sdiy] First exchanges with ChatGPT... program code
> extract + conversion.. AWESOME !!!
>
> I?m actually working on that very thing for a particular favorite old
> synth of mine. Stay tuned.
>
> On May 5, 2026, at 6:53?PM, el macaco via Synth-diy
> <synth-diy at synth-diy.org> <synth-diy at synth-diy.org> wrote:
>
> Yes this is a great result! Had me thinking if this could take an OS for
> an old synth or sampler and optimize or improve it.  Still would help to
> have it in the hands of someone who understands the code and could catch
> errors.
>
> Congrats!
>
>
>
> Get Outlook for iOS <https://aka.ms/o0ukef>
> ------------------------------
> *From:* Synth-diy <synth-diy-bounces at synth-diy.org>
> <synth-diy-bounces at synth-diy.org> on behalf of Benjamin Tremblay via
> Synth-diy <synth-diy at synth-diy.org> <synth-diy at synth-diy.org>
> *Sent:* Tuesday, May 5, 2026 2:30:06 PM
> *To:* sleepy_dog at gmx.de <sleepy_dog at gmx.de> <sleepy_dog at gmx.de>
> *Cc:* Synth-diy at synth-diy.org <Synth-diy at synth-diy.org>
> <Synth-diy at synth-diy.org>
> *Subject:* Re: [sdiy] First exchanges with ChatGPT... program code
> extract + conversion.. AWESOME !!!
>
> Yes. It?s for translating things.
> Benjamin Tremblay
>
> On May 5, 2026, at 3:07?PM, Steve via Synth-diy <synth-diy at synth-diy.org>
> <synth-diy at synth-diy.org> wrote:
>
> ?
>
> Actually, the described scenario is where I would have expected LLMs to
> likely produce good results. Two available, very comprehensive set of
> rules, and then transforming from one to the other.
> Not many more levels above that, except to understand the relatively
> straightforward goal of the user. At least if the two architectures are
> reasonably close in what they can do, instruction wise, w.r.t. the subset
> used by the code to be translated.
> Here, one does not expect of the "AI" to have a grand, actual
> understanding of things which it does not have.
>
> On 05.05.2026 16:35, Tom Wiltshire wrote:
>
>
>
> On 5 May 2026, at 14:54, Mike Bryant <mbryant at futurehorizons.com> wrote:
> I think we were all so gobsmacked by it working there was nothing left to
> say ?
>
>
> Yep, this exactly! It's pretty amazing that this came off.
>
> Well done, J-P!
>
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org
>
>
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org
>
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org
>
>
>
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org
>
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org
>
>
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org
>
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org
>


-- 
Timothy Ressel
909-423-5962
FutureRetro Synthesizers
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From tensiontype at hotmail.com  Thu May  7 15:36:47 2026
From: tensiontype at hotmail.com (Sean Ellis)
Date: Thu, 7 May 2026 13:36:47 +0000
Subject: [sdiy] New TI 5532
In-Reply-To: <CA+K2+DLMpwX-rMWOvMSCmSyA352xGTrDCJV8N3iUSS7h67_0uQ@mail.gmail.com>
References: <8d3fe6d4-c8b3-1062-7291-6e2def7847ec@gmx.de>
 <18829422-E546-4E52-996E-6418A58CBBE3@me.com>
 <SJ2P222MB08546D7633EC7ABE361F67D7C43E2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
 <CC810EB5-EDF4-46A0-919D-63FEFBB66F5E@ericframpton.com>
 <CWLP265MB7132A98FC7B498852479E80EDB3F2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <1c3518d6-7167-45a9-8743-c2a13907f1f5@gmx.com>
 <KL1PR02MB6663238C9F42EEA218A36A80B33F2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <C609B059-C63C-42C3-96D4-5B3C2DD47234@scale.la>
 <695987411.4638817.1778112830525@mail.yahoo.com>
 <CA+K2+DLMpwX-rMWOvMSCmSyA352xGTrDCJV8N3iUSS7h67_0uQ@mail.gmail.com>
Message-ID: <KL1PR02MB66637AD64CF51D362A2696A3B33C2@KL1PR02MB6663.apcprd02.prod.outlook.com>

Just saw this thread, not sure if it was shared here. https://groupdiy.com/threads/the-new-ti-5532-chips-are-not-5532s-weve-used-for-decades.93707/
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From mskala at northcoastsynthesis.com  Thu May  7 16:58:19 2026
From: mskala at northcoastsynthesis.com (mskala at northcoastsynthesis.com)
Date: Thu, 7 May 2026 10:58:19 -0400 (EDT)
Subject: [sdiy] New TI 5532
In-Reply-To: <KL1PR02MB66637AD64CF51D362A2696A3B33C2@KL1PR02MB6663.apcprd02.prod.outlook.com>
References: <8d3fe6d4-c8b3-1062-7291-6e2def7847ec@gmx.de>
 <18829422-E546-4E52-996E-6418A58CBBE3@me.com>
 <SJ2P222MB08546D7633EC7ABE361F67D7C43E2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
 <CC810EB5-EDF4-46A0-919D-63FEFBB66F5E@ericframpton.com>
 <CWLP265MB7132A98FC7B498852479E80EDB3F2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <1c3518d6-7167-45a9-8743-c2a13907f1f5@gmx.com>
 <KL1PR02MB6663238C9F42EEA218A36A80B33F2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <C609B059-C63C-42C3-96D4-5B3C2DD47234@scale.la>
 <695987411.4638817.1778112830525@mail.yahoo.com>
 <CA+K2+DLMpwX-rMWOvMSCmSyA352xGTrDCJV8N3iUSS7h67_0uQ@mail.gmail.com>
 <KL1PR02MB66637AD64CF51D362A2696A3B33C2@KL1PR02MB6663.apcprd02.prod.outlook.com>
Message-ID: <4df71150-1a5a-1d71-66aa-db2cb021f2e8@northcoastsynthesis.com>

On Thu, 7 May 2026, Sean Ellis via Synth-diy wrote:

> Just saw this thread, not sure if it was shared here.https://groupdiy.com/threads/the-new-ti-5532-chips-are-not-5532s-weve-used-
> for-decades.93707/

Sounds like the TL074H story over again.

It is a genuine problem that obsolete processes can't be kept running
indefinitely.  They can't necessarily keep making a chip that they've been
making for decades, and keep making it exactly the same way, especially
not with the commercial reality of dwindling demand for old analog parts.

If only one tech knows how to run the machine, and the output of that
machine already doesn't sell enough to pay his salary, then when that guy
retires it's not reasonable to expect them to have another one trained,
and keep doing so forever.  And there can be plenty of little gotchas like
"Oh, that old analog process involved washing the die in X solvent, which
we're no longer allowed to use for environmental reasons."  At some point
they may really have to pull the plug.

But I don't understand why they can't admit that they're outright ending
production of a given part, and assign a new part number (not just a
suffix!) for the "better" replacement.  Make it clear that it's a new part
and not just the evolution of the old one.  The supply of few-digit part
numbers isn't infinite, but it's big enough; and keeping the reputation
for dealing with customers honestly instead of jerking us around breaking
our designs, ought to be worth something.

-- 
Matthew Skala
North Coast Synthesis Ltd.

From autophage at gmail.com  Thu May  7 17:27:08 2026
From: autophage at gmail.com (Eric Honour)
Date: Thu, 7 May 2026 11:27:08 -0400
Subject: [sdiy] New TI 5532
In-Reply-To: <4df71150-1a5a-1d71-66aa-db2cb021f2e8@northcoastsynthesis.com>
References: <8d3fe6d4-c8b3-1062-7291-6e2def7847ec@gmx.de>
 <18829422-E546-4E52-996E-6418A58CBBE3@me.com>
 <SJ2P222MB08546D7633EC7ABE361F67D7C43E2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
 <CC810EB5-EDF4-46A0-919D-63FEFBB66F5E@ericframpton.com>
 <CWLP265MB7132A98FC7B498852479E80EDB3F2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <1c3518d6-7167-45a9-8743-c2a13907f1f5@gmx.com>
 <KL1PR02MB6663238C9F42EEA218A36A80B33F2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <C609B059-C63C-42C3-96D4-5B3C2DD47234@scale.la>
 <695987411.4638817.1778112830525@mail.yahoo.com>
 <CA+K2+DLMpwX-rMWOvMSCmSyA352xGTrDCJV8N3iUSS7h67_0uQ@mail.gmail.com>
 <KL1PR02MB66637AD64CF51D362A2696A3B33C2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <4df71150-1a5a-1d71-66aa-db2cb021f2e8@northcoastsynthesis.com>
Message-ID: <CA+BLRHZMojFBbJqrDuvuOcz1Jvu5wcMwRwZ5UMDQU7CWAmqDfA@mail.gmail.com>

I'm actually curious if it would be plausible to add an additional
translation layer that allows a new part to behave like an old one.

In software development, there's a pattern called an "anti-corruption
layer" where you basically segregate legacy code apart from cleaner, more
modern code.  I'm basically envisioning a hardware version of this, but
inverted - a "re-corruption layer".

On Thu, May 7, 2026 at 11:06?AM Matthew Skala via Synth-diy <
synth-diy at synth-diy.org> wrote:

> On Thu, 7 May 2026, Sean Ellis via Synth-diy wrote:
>
> > Just saw this thread, not sure if it was shared here.
> https://groupdiy.com/threads/the-new-ti-5532-chips-are-not-5532s-weve-used-
> > for-decades.93707/
>
> Sounds like the TL074H story over again.
>
> It is a genuine problem that obsolete processes can't be kept running
> indefinitely.  They can't necessarily keep making a chip that they've been
> making for decades, and keep making it exactly the same way, especially
> not with the commercial reality of dwindling demand for old analog parts.
>
> If only one tech knows how to run the machine, and the output of that
> machine already doesn't sell enough to pay his salary, then when that guy
> retires it's not reasonable to expect them to have another one trained,
> and keep doing so forever.  And there can be plenty of little gotchas like
> "Oh, that old analog process involved washing the die in X solvent, which
> we're no longer allowed to use for environmental reasons."  At some point
> they may really have to pull the plug.
>
> But I don't understand why they can't admit that they're outright ending
> production of a given part, and assign a new part number (not just a
> suffix!) for the "better" replacement.  Make it clear that it's a new part
> and not just the evolution of the old one.  The supply of few-digit part
> numbers isn't infinite, but it's big enough; and keeping the reputation
> for dealing with customers honestly instead of jerking us around breaking
> our designs, ought to be worth something.
>
> --
> Matthew Skala
> North Coast Synthesis Ltd.
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org
>
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From mskala at northcoastsynthesis.com  Thu May  7 18:02:56 2026
From: mskala at northcoastsynthesis.com (mskala at northcoastsynthesis.com)
Date: Thu, 7 May 2026 12:02:56 -0400 (EDT)
Subject: [sdiy] New TI 5532
In-Reply-To: <CA+BLRHZMojFBbJqrDuvuOcz1Jvu5wcMwRwZ5UMDQU7CWAmqDfA@mail.gmail.com>
References: <8d3fe6d4-c8b3-1062-7291-6e2def7847ec@gmx.de>
 <18829422-E546-4E52-996E-6418A58CBBE3@me.com>
 <SJ2P222MB08546D7633EC7ABE361F67D7C43E2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
 <CC810EB5-EDF4-46A0-919D-63FEFBB66F5E@ericframpton.com>
 <CWLP265MB7132A98FC7B498852479E80EDB3F2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <1c3518d6-7167-45a9-8743-c2a13907f1f5@gmx.com>
 <KL1PR02MB6663238C9F42EEA218A36A80B33F2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <C609B059-C63C-42C3-96D4-5B3C2DD47234@scale.la>
 <695987411.4638817.1778112830525@mail.yahoo.com>
 <CA+K2+DLMpwX-rMWOvMSCmSyA352xGTrDCJV8N3iUSS7h67_0uQ@mail.gmail.com>
 <KL1PR02MB66637AD64CF51D362A2696A3B33C2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <4df71150-1a5a-1d71-66aa-db2cb021f2e8@northcoastsynthesis.com>
 <CA+BLRHZMojFBbJqrDuvuOcz1Jvu5wcMwRwZ5UMDQU7CWAmqDfA@mail.gmail.com>
Message-ID: <f8b1259f-795b-b64d-0daf-93e6657795f9@northcoastsynthesis.com>

On Thu, 7 May 2026, Eric Honour wrote:

> I'm actually curious if it would be plausible to add an additional
> translation layer that allows a new part to behave like an old one.
> In software development, there's a pattern called an "anti-corruption layer"
> where you basically segregate legacy code apart from cleaner, more modern
> code.? I'm basically envisioning a hardware version of this, but inverted -
> a "re-corruption layer".

Probably hard to do in this particular case because the new part has lower
power supply voltage (and therefore possible output swing) and slew rate.
If you really needed those particular specifications, then in order to
"translate" the new part's behaviour, you would need to add some kind of
faster, higher-voltage amplifier on the output... and then that
translating amplifier itself could probably just replace the 5532
directly, making the involvement of the new 5532 superfluous.  (Never mind
any possible need for translation on the input side as well.)

More generally, there are certainly cases where something like that might
be done.  For instance, lots of people have developed replacements for the
much-missed uA726 heated matched pair.  Most often these replacements are
*not* actually heated matched pairs like the original, let alone on a
single chip like the original, but they're at least capable of dropping
into the same circuits, and they may be good enough if other measures are
taken to keep the two sides of the pair at the same temperature.

-- 
Matthew Skala
North Coast Synthesis Ltd.

From brianw at audiobanshee.com  Thu May  7 18:13:54 2026
From: brianw at audiobanshee.com (brianw)
Date: Thu, 7 May 2026 09:13:54 -0700
Subject: [sdiy] New TI 5532
In-Reply-To: <CA+BLRHZMojFBbJqrDuvuOcz1Jvu5wcMwRwZ5UMDQU7CWAmqDfA@mail.gmail.com>
References: <8d3fe6d4-c8b3-1062-7291-6e2def7847ec@gmx.de>
 <18829422-E546-4E52-996E-6418A58CBBE3@me.com>
 <SJ2P222MB08546D7633EC7ABE361F67D7C43E2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
 <CC810EB5-EDF4-46A0-919D-63FEFBB66F5E@ericframpton.com>
 <CWLP265MB7132A98FC7B498852479E80EDB3F2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <1c3518d6-7167-45a9-8743-c2a13907f1f5@gmx.com>
 <KL1PR02MB6663238C9F42EEA218A36A80B33F2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <C609B059-C63C-42C3-96D4-5B3C2DD47234@scale.la>
 <695987411.4638817.1778112830525@mail.yahoo.com>
 <CA+K2+DLMpwX-rMWOvMSCmSyA352xGTrDCJV8N3iUSS7h67_0uQ@mail.gmail.com>
 <KL1PR02MB66637AD64CF51D362A2696A3B33C2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <4df71150-1a5a-1d71-66aa-db2cb021f2e8@northcoastsynthesis.com>
 <CA+BLRHZMojFBbJqrDuvuOcz1Jvu5wcMwRwZ5UMDQU7CWAmqDfA@mail.gmail.com>
Message-ID: <7596FEC0-D7EF-4EBB-B480-AC2B05BAA53B@audiobanshee.com>

For something as basic and fundamental as an op-amp, it's very likely that such a translation layer would be impossible.

if it were possible to design a translation layer, it would surely be an order of magnitude more complex than simply designing another op-amp that has the desired characteristics natively.

In contrast, if there is a subsystem like a power supply, then it's more plausible to translate one power supply design to another.

Using the software analogy, I'd say that an op-amp is like the programming language itself, rather than a collection of thousands of lines of code that can be translated. Sure, you can translate programming languages, but it takes an order of magnitude more resources than simply rewriting the code in the new language.


On May 7, 2026, at 8:27 AM, Eric Honour wrote:
> I'm actually curious if it would be plausible to add an additional translation layer that allows a new part to behave like an old one.
> 
> In software development, there's a pattern called an "anti-corruption layer" where you basically segregate legacy code apart from cleaner, more modern code.  I'm basically envisioning a hardware version of this, but inverted - a "re-corruption layer".
> 
> On Thu, May 7, 2026 at 11:06?AM Matthew Skala via Synth-diy <synth-diy at synth-diy.org <mailto:synth-diy at synth-diy.org>> wrote:
> On Thu, 7 May 2026, Sean Ellis via Synth-diy wrote:
> 
> > Just saw this thread, not sure if it was shared here.https://groupdiy.com/threads/the-new-ti-5532-chips-are-not-5532s-weve-used- <https://groupdiy.com/threads/the-new-ti-5532-chips-are-not-5532s-weve-used->
> > for-decades.93707/
> 
> Sounds like the TL074H story over again.
> 
> It is a genuine problem that obsolete processes can't be kept running
> indefinitely.  They can't necessarily keep making a chip that they've been
> making for decades, and keep making it exactly the same way, especially
> not with the commercial reality of dwindling demand for old analog parts.
> 
> If only one tech knows how to run the machine, and the output of that
> machine already doesn't sell enough to pay his salary, then when that guy
> retires it's not reasonable to expect them to have another one trained,
> and keep doing so forever.  And there can be plenty of little gotchas like
> "Oh, that old analog process involved washing the die in X solvent, which
> we're no longer allowed to use for environmental reasons."  At some point
> they may really have to pull the plug.
> 
> But I don't understand why they can't admit that they're outright ending
> production of a given part, and assign a new part number (not just a
> suffix!) for the "better" replacement.  Make it clear that it's a new part
> and not just the evolution of the old one.  The supply of few-digit part
> numbers isn't infinite, but it's big enough; and keeping the reputation
> for dealing with customers honestly instead of jerking us around breaking
> our designs, ought to be worth something.
> 
> -- 
> Matthew Skala
> North Coast Synthesis Ltd.

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From mbryant at futurehorizons.com  Thu May  7 18:27:00 2026
From: mbryant at futurehorizons.com (Mike Bryant)
Date: Thu, 7 May 2026 16:27:00 +0000
Subject: [sdiy] New TI 5532
In-Reply-To: <KL1PR02MB66637AD64CF51D362A2696A3B33C2@KL1PR02MB6663.apcprd02.prod.outlook.com>
References: <8d3fe6d4-c8b3-1062-7291-6e2def7847ec@gmx.de>
 <18829422-E546-4E52-996E-6418A58CBBE3@me.com>
 <SJ2P222MB08546D7633EC7ABE361F67D7C43E2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
 <CC810EB5-EDF4-46A0-919D-63FEFBB66F5E@ericframpton.com>
 <CWLP265MB7132A98FC7B498852479E80EDB3F2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <1c3518d6-7167-45a9-8743-c2a13907f1f5@gmx.com>
 <KL1PR02MB6663238C9F42EEA218A36A80B33F2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <C609B059-C63C-42C3-96D4-5B3C2DD47234@scale.la>
 <695987411.4638817.1778112830525@mail.yahoo.com>
 <CA+K2+DLMpwX-rMWOvMSCmSyA352xGTrDCJV8N3iUSS7h67_0uQ@mail.gmail.com>
 <KL1PR02MB66637AD64CF51D362A2696A3B33C2@KL1PR02MB6663.apcprd02.prod.outlook.com>
Message-ID: <CWLP265MB7132D9F042297BFE165A1D64DB3C2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>

Would have been better if they'd just said use the OPA1678 which is moreorless drop-in for SMT versions.

There are several Chinese suppliers of real 5532 clones in DIP-8 if you need them.  The ones from COSINE are definitely drop in if you're worried.  Haven't tried the other suppliers.


________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Sean Ellis via Synth-diy <synth-diy at synth-diy.org>
Sent: 07 May 2026 14:36
Cc: Synth-diy Mailing List <synth-diy at synth-diy.org>
Subject: [sdiy] New TI 5532

Just saw this thread, not sure if it was shared here. https://groupdiy.com/threads/the-new-ti-5532-chips-are-not-5532s-weve-used-for-decades.93707/
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From elmacaco at hotmail.com  Thu May  7 19:53:36 2026
From: elmacaco at hotmail.com (el macaco)
Date: Thu, 7 May 2026 17:53:36 +0000
Subject: [sdiy] New TI 5532
In-Reply-To: <CWLP265MB7132D9F042297BFE165A1D64DB3C2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
References: <8d3fe6d4-c8b3-1062-7291-6e2def7847ec@gmx.de>
 <18829422-E546-4E52-996E-6418A58CBBE3@me.com>
 <SJ2P222MB08546D7633EC7ABE361F67D7C43E2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
 <CC810EB5-EDF4-46A0-919D-63FEFBB66F5E@ericframpton.com>
 <CWLP265MB7132A98FC7B498852479E80EDB3F2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <1c3518d6-7167-45a9-8743-c2a13907f1f5@gmx.com>
 <KL1PR02MB6663238C9F42EEA218A36A80B33F2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <C609B059-C63C-42C3-96D4-5B3C2DD47234@scale.la>
 <695987411.4638817.1778112830525@mail.yahoo.com>
 <CA+K2+DLMpwX-rMWOvMSCmSyA352xGTrDCJV8N3iUSS7h67_0uQ@mail.gmail.com>
 <KL1PR02MB66637AD64CF51D362A2696A3B33C2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <CWLP265MB7132D9F042297BFE165A1D64DB3C2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
Message-ID: <SJ2P222MB085420F6DDC9472451780D3CC43C2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>

As a side question, what?s a good replacement for the uA726?

Want a couple just in case.

Thanks,

Ed

Get Outlook for iOS<https://aka.ms/o0ukef>
________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Mike Bryant <mbryant at futurehorizons.com>
Sent: Thursday, May 7, 2026 11:27:00 AM
To: Sean Ellis <tensiontype at hotmail.com>
Cc: Synth-diy Mailing List <synth-diy at synth-diy.org>
Subject: Re: [sdiy] New TI 5532

Would have been better if they'd just said use the OPA1678 which is moreorless drop-in for SMT versions.

There are several Chinese suppliers of real 5532 clones in DIP-8 if you need them.  The ones from COSINE are definitely drop in if you're worried.  Haven't tried the other suppliers.


________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Sean Ellis via Synth-diy <synth-diy at synth-diy.org>
Sent: 07 May 2026 14:36
Cc: Synth-diy Mailing List <synth-diy at synth-diy.org>
Subject: [sdiy] New TI 5532

Just saw this thread, not sure if it was shared here. https://groupdiy.com/threads/the-new-ti-5532-chips-are-not-5532s-weve-used-for-decades.93707/
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From synthdiy at adambaby.com  Fri May  8 01:48:18 2026
From: synthdiy at adambaby.com (Adam (synthDIY))
Date: Fri, 8 May 2026 09:48:18 +1000
Subject: [sdiy] New TI 5532
In-Reply-To: <SJ2P222MB085420F6DDC9472451780D3CC43C2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
References: <8d3fe6d4-c8b3-1062-7291-6e2def7847ec@gmx.de>
 <18829422-E546-4E52-996E-6418A58CBBE3@me.com>
 <SJ2P222MB08546D7633EC7ABE361F67D7C43E2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
 <CC810EB5-EDF4-46A0-919D-63FEFBB66F5E@ericframpton.com>
 <CWLP265MB7132A98FC7B498852479E80EDB3F2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <1c3518d6-7167-45a9-8743-c2a13907f1f5@gmx.com>
 <KL1PR02MB6663238C9F42EEA218A36A80B33F2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <C609B059-C63C-42C3-96D4-5B3C2DD47234@scale.la>
 <695987411.4638817.1778112830525@mail.yahoo.com>
 <CA+K2+DLMpwX-rMWOvMSCmSyA352xGTrDCJV8N3iUSS7h67_0uQ@mail.gmail.com>
 <KL1PR02MB66637AD64CF51D362A2696A3B33C2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <CWLP265MB7132D9F042297BFE165A1D64DB3C2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <SJ2P222MB085420F6DDC9472451780D3CC43C2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
Message-ID: <13A16296-3ECB-4BBD-8248-CE0DE7D14A62@adambaby.com>



> On 8 May 2026, at 03:53, el macaco via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> As a side question, what?s a good replacement for the uA726?


People have been asking that for decades!!!!


A


















> 
> Want a couple just in case.
> 
> Thanks,
> 
> Ed
> 
> Get Outlook for iOS <https://aka.ms/o0ukef>
> From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Mike Bryant <mbryant at futurehorizons.com>
> Sent: Thursday, May 7, 2026 11:27:00 AM
> To: Sean Ellis <tensiontype at hotmail.com>
> Cc: Synth-diy Mailing List <synth-diy at synth-diy.org>
> Subject: Re: [sdiy] New TI 5532
>  
> Would have been better if they'd just said use the OPA1678 which is moreorless drop-in for SMT versions.
> 
> There are several Chinese suppliers of real 5532 clones in DIP-8 if you need them.  The ones from COSINE are definitely drop in if you're worried.  Haven't tried the other suppliers.
> 
> 
> From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Sean Ellis via Synth-diy <synth-diy at synth-diy.org>
> Sent: 07 May 2026 14:36
> Cc: Synth-diy Mailing List <synth-diy at synth-diy.org>
> Subject: [sdiy] New TI 5532
>  
> Just saw this thread, not sure if it was shared here. https://groupdiy.com/threads/the-new-ti-5532-chips-are-not-5532s-weve-used-for-decades.93707/
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org

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From sines_list at scale.la  Fri May  8 02:21:06 2026
From: sines_list at scale.la (Todd Sines)
Date: Thu, 7 May 2026 20:21:06 -0400
Subject: [sdiy] New TI 5532
In-Reply-To: <13A16296-3ECB-4BBD-8248-CE0DE7D14A62@adambaby.com>
References: <8d3fe6d4-c8b3-1062-7291-6e2def7847ec@gmx.de>
 <18829422-E546-4E52-996E-6418A58CBBE3@me.com>
 <SJ2P222MB08546D7633EC7ABE361F67D7C43E2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
 <CC810EB5-EDF4-46A0-919D-63FEFBB66F5E@ericframpton.com>
 <CWLP265MB7132A98FC7B498852479E80EDB3F2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <1c3518d6-7167-45a9-8743-c2a13907f1f5@gmx.com>
 <KL1PR02MB6663238C9F42EEA218A36A80B33F2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <C609B059-C63C-42C3-96D4-5B3C2DD47234@scale.la>
 <695987411.4638817.1778112830525@mail.yahoo.com>
 <CA+K2+DLMpwX-rMWOvMSCmSyA352xGTrDCJV8N3iUSS7h67_0uQ@mail.gmail.com>
 <KL1PR02MB66637AD64CF51D362A2696A3B33C2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <CWLP265MB7132D9F042297BFE165A1D64DB3C2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <SJ2P222MB085420F6DDC9472451780D3CC43C2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
 <13A16296-3ECB-4BBD-8248-CE0DE7D14A62@adambaby.com>
Message-ID: <03912CAF-C04E-4510-AF5A-FF7D01EA2EA4@scale.la>

There?s this ( have a few for some B208Rs I made)
https://www.portabellabz.be/pa726.html

I bought these, but have been too chicken to try them
https://www.utsource.net/itm/p/327411.html

(As you can see here)
https://www.modwiggler.com/forum/viewtopic.php?t=194541

More discussion, featuring Mike Peake, who should know what?s up
https://modwiggler.com/forum/viewtopic.php?t=150851
https://www.modwiggler.com/forum/viewtopic.php?t=76091

> On May 7, 2026, at 7:48?PM, Adam (synthDIY) <synthdiy at adambaby.com> wrote:
> 
> 
> 
>> On 8 May 2026, at 03:53, el macaco via Synth-diy <synth-diy at synth-diy.org> wrote:
>> 
>> As a side question, what?s a good replacement for the uA726?
> 
> 
> People have been asking that for decades!!!!
> 
> 
> A
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
>> 
>> Want a couple just in case.
>> 
>> Thanks,
>> 
>> Ed
>> 
>> Get Outlook for iOS <https://aka.ms/o0ukef>
>> From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Mike Bryant <mbryant at futurehorizons.com>
>> Sent: Thursday, May 7, 2026 11:27:00 AM
>> To: Sean Ellis <tensiontype at hotmail.com>
>> Cc: Synth-diy Mailing List <synth-diy at synth-diy.org>
>> Subject: Re: [sdiy] New TI 5532
>>  
>> Would have been better if they'd just said use the OPA1678 which is moreorless drop-in for SMT versions.
>> 
>> There are several Chinese suppliers of real 5532 clones in DIP-8 if you need them.  The ones from COSINE are definitely drop in if you're worried.  Haven't tried the other suppliers.
>> 
>> 
>> From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Sean Ellis via Synth-diy <synth-diy at synth-diy.org>
>> Sent: 07 May 2026 14:36
>> Cc: Synth-diy Mailing List <synth-diy at synth-diy.org>
>> Subject: [sdiy] New TI 5532
>>  
>> Just saw this thread, not sure if it was shared here. https://groupdiy.com/threads/the-new-ti-5532-chips-are-not-5532s-weve-used-for-decades.93707/
>> ________________________________________________________
>> This is the Synth-diy mailing list
>> Submit email to: Synth-diy at synth-diy.org
>> View archive at: https://synth-diy.org/pipermail/synth-diy/
>> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
>> Selling or trading? Use marketplace at synth-diy.org
> 
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org

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From synthdiy at adambaby.com  Fri May  8 02:32:35 2026
From: synthdiy at adambaby.com (Adam (synthDIY))
Date: Fri, 8 May 2026 10:32:35 +1000
Subject: [sdiy] new 726  (WAS New TI 5532)
In-Reply-To: <03912CAF-C04E-4510-AF5A-FF7D01EA2EA4@scale.la>
References: <8d3fe6d4-c8b3-1062-7291-6e2def7847ec@gmx.de>
 <18829422-E546-4E52-996E-6418A58CBBE3@me.com>
 <SJ2P222MB08546D7633EC7ABE361F67D7C43E2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
 <CC810EB5-EDF4-46A0-919D-63FEFBB66F5E@ericframpton.com>
 <CWLP265MB7132A98FC7B498852479E80EDB3F2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <1c3518d6-7167-45a9-8743-c2a13907f1f5@gmx.com>
 <KL1PR02MB6663238C9F42EEA218A36A80B33F2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <C609B059-C63C-42C3-96D4-5B3C2DD47234@scale.la>
 <695987411.4638817.1778112830525@mail.yahoo.com>
 <CA+K2+DLMpwX-rMWOvMSCmSyA352xGTrDCJV8N3iUSS7h67_0uQ@mail.gmail.com>
 <KL1PR02MB66637AD64CF51D362A2696A3B33C2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <CWLP265MB7132D9F042297BFE165A1D64DB3C2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <SJ2P222MB085420F6DDC9472451780D3CC43C2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
 <13A16296-3ECB-4BBD-8248-CE0DE7D14A62@adambaby.com>
 <03912CAF-C04E-4510-AF5A-FF7D01EA2EA4@scale.la>
Message-ID: <072BAF6B-7C07-4414-A792-066DD7D3F49F@adambaby.com>



> On 8 May 2026, at 10:21, Todd Sines <sines_list at scale.la> wrote:
> 
> There?s this ( have a few for some B208Rs I made)
> https://www.portabellabz.be/pa726.html


Wow, thanks Todd! I wasn't aware of this!
My SH-09 and SH-2 both use the Fairchild, this might be a drop-in, if/when needed

A
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From elmacaco at hotmail.com  Fri May  8 07:51:54 2026
From: elmacaco at hotmail.com (el macaco)
Date: Fri, 8 May 2026 05:51:54 +0000
Subject: [sdiy] New TI 5532
In-Reply-To: <03912CAF-C04E-4510-AF5A-FF7D01EA2EA4@scale.la>
References: <8d3fe6d4-c8b3-1062-7291-6e2def7847ec@gmx.de>
 <18829422-E546-4E52-996E-6418A58CBBE3@me.com>
 <SJ2P222MB08546D7633EC7ABE361F67D7C43E2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
 <CC810EB5-EDF4-46A0-919D-63FEFBB66F5E@ericframpton.com>
 <CWLP265MB7132A98FC7B498852479E80EDB3F2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <1c3518d6-7167-45a9-8743-c2a13907f1f5@gmx.com>
 <KL1PR02MB6663238C9F42EEA218A36A80B33F2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <C609B059-C63C-42C3-96D4-5B3C2DD47234@scale.la>
 <695987411.4638817.1778112830525@mail.yahoo.com>
 <CA+K2+DLMpwX-rMWOvMSCmSyA352xGTrDCJV8N3iUSS7h67_0uQ@mail.gmail.com>
 <KL1PR02MB66637AD64CF51D362A2696A3B33C2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <CWLP265MB7132D9F042297BFE165A1D64DB3C2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <SJ2P222MB085420F6DDC9472451780D3CC43C2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
 <13A16296-3ECB-4BBD-8248-CE0DE7D14A62@adambaby.com>
 <03912CAF-C04E-4510-AF5A-FF7D01EA2EA4@scale.la>
Message-ID: <LV8P222MB0861FEE55FE34E24B798151BC43D2@LV8P222MB0861.NAMP222.PROD.OUTLOOK.COM>

Thanks Todd!

That will do for the 2 that I want to have as spares!

Glad the SH-2 circuit ties the necessary pins together to be able to use this circuit.

Adam, I know, I?ve been here since ?99!  I actually had 2 spares I got in 2000, but sadly they were lost in a move.

We always find a way!

Ed

Get Outlook for iOS<https://aka.ms/o0ukef>
________________________________
From: Todd Sines <sines_list at scale.la>
Sent: Thursday, May 7, 2026 7:21:06 PM
To: Adam (synthDIY) <synthdiy at adambaby.com>
Cc: el macaco <elmacaco at hotmail.com>; Synth-diy Mailing List <synth-diy at synth-diy.org>
Subject: Re: [sdiy] New TI 5532

There?s this ( have a few for some B208Rs I made)
https://www.portabellabz.be/pa726.html

I bought these, but have been too chicken to try them
https://www.utsource.net/itm/p/327411.html

(As you can see here)
https://www.modwiggler.com/forum/viewtopic.php?t=194541

More discussion, featuring Mike Peake, who should know what?s up
https://modwiggler.com/forum/viewtopic.php?t=150851
https://www.modwiggler.com/forum/viewtopic.php?t=76091

On May 7, 2026, at 7:48?PM, Adam (synthDIY) <synthdiy at adambaby.com> wrote:



On 8 May 2026, at 03:53, el macaco via Synth-diy <synth-diy at synth-diy.org> wrote:

As a side question, what?s a good replacement for the uA726?


People have been asking that for decades!!!!


A



















Want a couple just in case.

Thanks,

Ed

Get Outlook for iOS<https://aka.ms/o0ukef>
________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Mike Bryant <mbryant at futurehorizons.com>
Sent: Thursday, May 7, 2026 11:27:00 AM
To: Sean Ellis <tensiontype at hotmail.com>
Cc: Synth-diy Mailing List <synth-diy at synth-diy.org>
Subject: Re: [sdiy] New TI 5532

Would have been better if they'd just said use the OPA1678 which is moreorless drop-in for SMT versions.

There are several Chinese suppliers of real 5532 clones in DIP-8 if you need them.  The ones from COSINE are definitely drop in if you're worried.  Haven't tried the other suppliers.


________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Sean Ellis via Synth-diy <synth-diy at synth-diy.org>
Sent: 07 May 2026 14:36
Cc: Synth-diy Mailing List <synth-diy at synth-diy.org>
Subject: [sdiy] New TI 5532

Just saw this thread, not sure if it was shared here. https://groupdiy.com/threads/the-new-ti-5532-chips-are-not-5532s-weve-used-for-decades.93707/
________________________________________________________
This is the Synth-diy mailing list
Submit email to: Synth-diy at synth-diy.org
View archive at: https://synth-diy.org/pipermail/synth-diy/
Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
Selling or trading? Use marketplace at synth-diy.org

________________________________________________________
This is the Synth-diy mailing list
Submit email to: Synth-diy at synth-diy.org
View archive at: https://synth-diy.org/pipermail/synth-diy/
Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
Selling or trading? Use marketplace at synth-diy.org

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From rrsounds at aol.com  Fri May  8 11:03:06 2026
From: rrsounds at aol.com (rrsounds)
Date: Fri, 8 May 2026 11:03:06 +0200
Subject: [sdiy] New TI 5532
In-Reply-To: <CWLP265MB7132D9F042297BFE165A1D64DB3C2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
References: <CWLP265MB7132D9F042297BFE165A1D64DB3C2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
Message-ID: <FF3087E5-924C-40DD-995C-0FD3CA1AC1C3@aol.com>

But does it have the 5532?s output drive capability? Not very many replacements have a similar spec.

David Reaves
David Reaves Audio, LLC

Sent from my iPad

> On May 7, 2026, at 6:31?PM, Mike Bryant <mbryant at futurehorizons.com> wrote:
> 
> Would have been better if they'd just said use the OPA1678 which is moreorless drop-in for SMT versions.



From rburnett at richieburnett.co.uk  Fri May  8 11:38:43 2026
From: rburnett at richieburnett.co.uk (Richie Burnett)
Date: Fri, 8 May 2026 10:38:43 +0100
Subject: [sdiy] Slide pot cleaning
In-Reply-To: <075f41a4-03f1-4013-ae41-4643bd5cdc3c@mnet-online.de>
References: <bf598d66407004ba2f744fba090ec084@richieburnett.co.uk>
 <EDA5BAD9-5561-4B52-9AFB-A04A70556DB0@adambaby.com>
 <075f41a4-03f1-4013-ae41-4643bd5cdc3c@mnet-online.de>
Message-ID: <58414ADB7AD04C3AB41CC00C28D1E3EC@DESKTOPUHPK2VO>

Thanks for all the tips guys.  I equipped myself with IPA, DeoxIT F5, cotton 
buds, acid-free silicon grease and a solder sucker and spent the best part 
of two days de-soldering, opening, cleaning, re-greasing and re-soldering 
all of the slide pots on my SH-09.  It wasn't much fun, and was a lot more 
time-consuming than I had imagined!  On the plus side all of the slide pots 
now work perfectly with no crackling or jumping.

I also bought some "2mm adhesive craft foam sheet" from UK Hobbycraft and 
cut slits in this to make new dust covers for the groups of sliders.  This 
seemed preferable to felt that might shed lint into the sliders over time. 
I guess there's a chance that this new foam dust-guard might eventually dry 
up and disintegrate into tiny brittle pieces like the old one did, but if I 
can get another 40 years out of it that will see me out! :-)

I'm particularly grateful for Adam's warning that the resonance slide pot is 
fitted upside down relative to all of the other pots on the control panel! 
This would have caught me out for sure had I not been pre-warned and marked 
the end of each slider that was closest to the keys before removing them one 
by one.  My only tip to anyone contemplating doing similar to clean out 
sliders on their own vintage synth would be to exercise caution when using 
the pliers to fold back the little steel tabs on the bottom of the 
potentiometer's case (shown in Adam's article):

https://mezzoauto.blogspot.com/2017/05/roland-sh-09-slide-pot-rehab.html

I got a bit over-confident after doing the first dozen pots, and then 
managed to slightly pinch or somehow distort the shape of the rectangular 
steel enclosure on one of the slide pots.  This made the slide action have a 
lot more physical resistance at one point along it's travel.  Of course I 
didn't notice until I'd soldered it back in, so had to remove it and sort 
that out.  It's quite easy to bend the case and even the tiniest bit alters 
the feel of the slider action.

-Richie,


-- 
This email has been checked for viruses by AVG antivirus software.
www.avg.com

From synthdiy at adambaby.com  Fri May  8 12:06:52 2026
From: synthdiy at adambaby.com (Adam (synthDIY))
Date: Fri, 8 May 2026 20:06:52 +1000
Subject: [sdiy] Slide pot cleaning
In-Reply-To: <58414ADB7AD04C3AB41CC00C28D1E3EC@DESKTOPUHPK2VO>
References: <bf598d66407004ba2f744fba090ec084@richieburnett.co.uk>
 <EDA5BAD9-5561-4B52-9AFB-A04A70556DB0@adambaby.com>
 <075f41a4-03f1-4013-ae41-4643bd5cdc3c@mnet-online.de>
 <58414ADB7AD04C3AB41CC00C28D1E3EC@DESKTOPUHPK2VO>
Message-ID: <BF9A6AAE-C34F-4D35-A7D1-27DE2569508E@adambaby.com>

Dontcha just love vintage synths??!!!

They tell me it's the same for vintage cars, vintage motorbikes, vintage boats...

A

> On 8 May 2026, at 19:38, Richie Burnett <rburnett at richieburnett.co.uk> wrote:
> 
> Thanks for all the tips guys.  I equipped myself with IPA, DeoxIT F5, cotton buds, acid-free silicon grease and a solder sucker and spent the best part of two days de-soldering, opening, cleaning, re-greasing and re-soldering all of the slide pots on my SH-09.  It wasn't much fun, and was a lot more time-consuming than I had imagined!  On the plus side all of the slide pots now work perfectly with no crackling or jumping.
> 
> I also bought some "2mm adhesive craft foam sheet" from UK Hobbycraft and cut slits in this to make new dust covers for the groups of sliders.  This seemed preferable to felt that might shed lint into the sliders over time. I guess there's a chance that this new foam dust-guard might eventually dry up and disintegrate into tiny brittle pieces like the old one did, but if I can get another 40 years out of it that will see me out! :-)
> 
> I'm particularly grateful for Adam's warning that the resonance slide pot is fitted upside down relative to all of the other pots on the control panel! This would have caught me out for sure had I not been pre-warned and marked the end of each slider that was closest to the keys before removing them one by one.  My only tip to anyone contemplating doing similar to clean out sliders on their own vintage synth would be to exercise caution when using the pliers to fold back the little steel tabs on the bottom of the potentiometer's case (shown in Adam's article):
> 
> https://mezzoauto.blogspot.com/2017/05/roland-sh-09-slide-pot-rehab.html
> 
> I got a bit over-confident after doing the first dozen pots, and then managed to slightly pinch or somehow distort the shape of the rectangular steel enclosure on one of the slide pots.  This made the slide action have a lot more physical resistance at one point along it's travel.  Of course I didn't notice until I'd soldered it back in, so had to remove it and sort that out.  It's quite easy to bend the case and even the tiniest bit alters the feel of the slider action.
> 
> -Richie,
> 
> 
> -- 
> This email has been checked for viruses by AVG antivirus software.
> www.avg.com
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org



From mbryant at futurehorizons.com  Fri May  8 12:12:27 2026
From: mbryant at futurehorizons.com (Mike Bryant)
Date: Fri, 8 May 2026 10:12:27 +0000
Subject: [sdiy] Slide pot cleaning
In-Reply-To: <BF9A6AAE-C34F-4D35-A7D1-27DE2569508E@adambaby.com>
References: <bf598d66407004ba2f744fba090ec084@richieburnett.co.uk>
 <EDA5BAD9-5561-4B52-9AFB-A04A70556DB0@adambaby.com>
 <075f41a4-03f1-4013-ae41-4643bd5cdc3c@mnet-online.de>
 <58414ADB7AD04C3AB41CC00C28D1E3EC@DESKTOPUHPK2VO>
 <BF9A6AAE-C34F-4D35-A7D1-27DE2569508E@adambaby.com>
Message-ID: <CWLP265MB71322D26956E89F8BD55C06BDB3D2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>

Ask my wife about restoring vintage clothes !   ?
You almost have to take them apart to the separate pieces of fabric, clean them, then start again.
________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Adam (synthDIY) <synthdiy at adambaby.com>
Sent: 08 May 2026 11:06
To: Richie Burnett <rburnett at richieburnett.co.uk>
Cc: synth-diy mailing list <synth-diy at synth-diy.org>
Subject: Re: [sdiy] Slide pot cleaning

Dontcha just love vintage synths??!!!

They tell me it's the same for vintage cars, vintage motorbikes, vintage boats...

A

> On 8 May 2026, at 19:38, Richie Burnett <rburnett at richieburnett.co.uk> wrote:
>
> Thanks for all the tips guys.  I equipped myself with IPA, DeoxIT F5, cotton buds, acid-free silicon grease and a solder sucker and spent the best part of two days de-soldering, opening, cleaning, re-greasing and re-soldering all of the slide pots on my SH-09.  It wasn't much fun, and was a lot more time-consuming than I had imagined!  On the plus side all of the slide pots now work perfectly with no crackling or jumping.
>
> I also bought some "2mm adhesive craft foam sheet" from UK Hobbycraft and cut slits in this to make new dust covers for the groups of sliders.  This seemed preferable to felt that might shed lint into the sliders over time. I guess there's a chance that this new foam dust-guard might eventually dry up and disintegrate into tiny brittle pieces like the old one did, but if I can get another 40 years out of it that will see me out! :-)
>
> I'm particularly grateful for Adam's warning that the resonance slide pot is fitted upside down relative to all of the other pots on the control panel! This would have caught me out for sure had I not been pre-warned and marked the end of each slider that was closest to the keys before removing them one by one.  My only tip to anyone contemplating doing similar to clean out sliders on their own vintage synth would be to exercise caution when using the pliers to fold back the little steel tabs on the bottom of the potentiometer's case (shown in Adam's article):
>
> https://mezzoauto.blogspot.com/2017/05/roland-sh-09-slide-pot-rehab.html
>
> I got a bit over-confident after doing the first dozen pots, and then managed to slightly pinch or somehow distort the shape of the rectangular steel enclosure on one of the slide pots.  This made the slide action have a lot more physical resistance at one point along it's travel.  Of course I didn't notice until I'd soldered it back in, so had to remove it and sort that out.  It's quite easy to bend the case and even the tiniest bit alters the feel of the slider action.
>
> -Richie,
>
>
> --
> This email has been checked for viruses by AVG antivirus software.
> www.avg.com<http://www.avg.com>
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org


________________________________________________________
This is the Synth-diy mailing list
Submit email to: Synth-diy at synth-diy.org
View archive at: https://synth-diy.org/pipermail/synth-diy/
Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
Selling or trading? Use marketplace at synth-diy.org
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From rburnett at richieburnett.co.uk  Fri May  8 12:17:02 2026
From: rburnett at richieburnett.co.uk (Richie Burnett)
Date: Fri, 8 May 2026 11:17:02 +0100
Subject: [sdiy] Slide pot cleaning
In-Reply-To: <BF9A6AAE-C34F-4D35-A7D1-27DE2569508E@adambaby.com>
References: <bf598d66407004ba2f744fba090ec084@richieburnett.co.uk>
 <EDA5BAD9-5561-4B52-9AFB-A04A70556DB0@adambaby.com>
 <075f41a4-03f1-4013-ae41-4643bd5cdc3c@mnet-online.de>
 <58414ADB7AD04C3AB41CC00C28D1E3EC@DESKTOPUHPK2VO>
 <BF9A6AAE-C34F-4D35-A7D1-27DE2569508E@adambaby.com>
Message-ID: <81047B35D66E44E69747EA503068C20C@DESKTOPUHPK2VO>

Yeah, I suppose I'm just paying the price for a lack of maintenance over the 
last decade!  Cleaning the SH-09 keybed contacts is next on my list...  Then 
changing the batteries in my JX-3P and Alpha Juno before they leak 
everywhere (>.<)

-Richie,



-----Original Message----- 
From: Adam (synthDIY)
Sent: Friday, May 8, 2026 11:06 AM
To: Richie Burnett
Cc: synth-diy mailing list
Subject: Re: [sdiy] Slide pot cleaning

Dontcha just love vintage synths??!!!

They tell me it's the same for vintage cars, vintage motorbikes, vintage 
boats...

A

> On 8 May 2026, at 19:38, Richie Burnett <rburnett at richieburnett.co.uk> 
> wrote:
>
> Thanks for all the tips guys.  I equipped myself with IPA, DeoxIT F5, 
> cotton buds, acid-free silicon grease and a solder sucker and spent the 
> best part of two days de-soldering, opening, cleaning, re-greasing and 
> re-soldering all of the slide pots on my SH-09.  It wasn't much fun, and 
> was a lot more time-consuming than I had imagined!  On the plus side all 
> of the slide pots now work perfectly with no crackling or jumping.
>
> I also bought some "2mm adhesive craft foam sheet" from UK Hobbycraft and 
> cut slits in this to make new dust covers for the groups of sliders.  This 
> seemed preferable to felt that might shed lint into the sliders over time. 
> I guess there's a chance that this new foam dust-guard might eventually 
> dry up and disintegrate into tiny brittle pieces like the old one did, but 
> if I can get another 40 years out of it that will see me out! :-)
>
> I'm particularly grateful for Adam's warning that the resonance slide pot 
> is fitted upside down relative to all of the other pots on the control 
> panel! This would have caught me out for sure had I not been pre-warned 
> and marked the end of each slider that was closest to the keys before 
> removing them one by one.  My only tip to anyone contemplating doing 
> similar to clean out sliders on their own vintage synth would be to 
> exercise caution when using the pliers to fold back the little steel tabs 
> on the bottom of the potentiometer's case (shown in Adam's article):
>
> https://mezzoauto.blogspot.com/2017/05/roland-sh-09-slide-pot-rehab.html
>
> I got a bit over-confident after doing the first dozen pots, and then 
> managed to slightly pinch or somehow distort the shape of the rectangular 
> steel enclosure on one of the slide pots.  This made the slide action have 
> a lot more physical resistance at one point along it's travel.  Of course 
> I didn't notice until I'd soldered it back in, so had to remove it and 
> sort that out.  It's quite easy to bend the case and even the tiniest bit 
> alters the feel of the slider action.
>
> -Richie,
>
>
> -- 
> This email has been checked for viruses by AVG antivirus software.
> www.avg.com
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org 


From mbryant at futurehorizons.com  Fri May  8 12:26:34 2026
From: mbryant at futurehorizons.com (Mike Bryant)
Date: Fri, 8 May 2026 10:26:34 +0000
Subject: [sdiy] New TI 5532
In-Reply-To: <FF3087E5-924C-40DD-995C-0FD3CA1AC1C3@aol.com>
References: <CWLP265MB7132D9F042297BFE165A1D64DB3C2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <FF3087E5-924C-40DD-995C-0FD3CA1AC1C3@aol.com>
Message-ID: <CWLP265MB71325950F4E2CA6C8A9575D9DB3D2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>

The 5532's output drive isn't actually specified - there's not a single number or graph in the datasheet.  As designers we've just always known what it does so well.

But yes I've always found the 1678 is just as good as output current vs voltage is specified at a similar cost.

And if you need belt and braces then the TLV9362 exceeds every 5532 parameter significantly at about twice the price.
________________________________
From: rrsounds <rrsounds at aol.com>
Sent: 08 May 2026 10:03
To: Mike Bryant <mbryant at futurehorizons.com>
Cc: Sean Ellis <tensiontype at hotmail.com>; Synth-diy Mailing List <synth-diy at synth-diy.org>
Subject: Re: [sdiy] New TI 5532

But does it have the 5532?s output drive capability? Not very many replacements have a similar spec.

David Reaves
David Reaves Audio, LLC

Sent from my iPad

> On May 7, 2026, at 6:31?PM, Mike Bryant <mbryant at futurehorizons.com> wrote:
>
> Would have been better if they'd just said use the OPA1678 which is moreorless drop-in for SMT versions.

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From sines_list at scale.la  Fri May  8 13:49:55 2026
From: sines_list at scale.la (Todd Sines)
Date: Fri, 8 May 2026 07:49:55 -0400
Subject: [sdiy] New TI 5532
In-Reply-To: <LV8P222MB0861FEE55FE34E24B798151BC43D2@LV8P222MB0861.NAMP222.PROD.OUTLOOK.COM>
References: <8d3fe6d4-c8b3-1062-7291-6e2def7847ec@gmx.de>
 <18829422-E546-4E52-996E-6418A58CBBE3@me.com>
 <SJ2P222MB08546D7633EC7ABE361F67D7C43E2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
 <CC810EB5-EDF4-46A0-919D-63FEFBB66F5E@ericframpton.com>
 <CWLP265MB7132A98FC7B498852479E80EDB3F2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <1c3518d6-7167-45a9-8743-c2a13907f1f5@gmx.com>
 <KL1PR02MB6663238C9F42EEA218A36A80B33F2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <C609B059-C63C-42C3-96D4-5B3C2DD47234@scale.la>
 <695987411.4638817.1778112830525@mail.yahoo.com>
 <CA+K2+DLMpwX-rMWOvMSCmSyA352xGTrDCJV8N3iUSS7h67_0uQ@mail.gmail.com>
 <KL1PR02MB66637AD64CF51D362A2696A3B33C2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <CWLP265MB7132D9F042297BFE165A1D64DB3C2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <SJ2P222MB085420F6DDC9472451780D3CC43C2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
 <13A16296-3ECB-4BBD-8248-CE0DE7D14A62@adambaby.com>
 <03912CAF-C04E-4510-AF5A-FF7D01EA2EA4@scale.la>
 <LV8P222MB0861FEE55FE34E24B798151BC43D2@LV8P222MB0861.NAMP222.PROD.OUTLOOK.COM>
Message-ID: <7324A7F3-37BF-4026-9BAC-FB6DB1100BDC@scale.la>

Great!
You?ll still need a CA3046, not as hard to find as a ua726, but not as ubiquitous as a TL072 :)


Todd

> On May 8, 2026, at 1:51?AM, el macaco <elmacaco at hotmail.com> wrote:
> 
> Thanks Todd!
> 
> That will do for the 2 that I want to have as spares!
> 
> Glad the SH-2 circuit ties the necessary pins together to be able to use this circuit.
> 
> Adam, I know, I?ve been here since ?99!  I actually had 2 spares I got in 2000, but sadly they were lost in a move.
> 
> We always find a way!
> 
> Ed
> 
> Get Outlook for iOS <https://aka.ms/o0ukef>
> From: Todd Sines <sines_list at scale.la>
> Sent: Thursday, May 7, 2026 7:21:06 PM
> To: Adam (synthDIY) <synthdiy at adambaby.com>
> Cc: el macaco <elmacaco at hotmail.com>; Synth-diy Mailing List <synth-diy at synth-diy.org>
> Subject: Re: [sdiy] New TI 5532
>  
> There?s this ( have a few for some B208Rs I made)
> https://www.portabellabz.be/pa726.html
> 
> I bought these, but have been too chicken to try them
> https://www.utsource.net/itm/p/327411.html
> 
> (As you can see here)
> https://www.modwiggler.com/forum/viewtopic.php?t=194541
> 
> More discussion, featuring Mike Peake, who should know what?s up
> https://modwiggler.com/forum/viewtopic.php?t=150851
> https://www.modwiggler.com/forum/viewtopic.php?t=76091
> 
>> On May 7, 2026, at 7:48?PM, Adam (synthDIY) <synthdiy at adambaby.com> wrote:
>> 
>> 
>> 
>>> On 8 May 2026, at 03:53, el macaco via Synth-diy <synth-diy at synth-diy.org> wrote:
>>> 
>>> As a side question, what?s a good replacement for the uA726?
>> 
>> 
>> People have been asking that for decades!!!!
>> 
>> 
>> A
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>>> 
>>> Want a couple just in case.
>>> 
>>> Thanks,
>>> 
>>> Ed
>>> 
>>> Get Outlook for iOS <https://aka.ms/o0ukef> 
>>> From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Mike Bryant <mbryant at futurehorizons.com>
>>> Sent: Thursday, May 7, 2026 11:27:00 AM
>>> To: Sean Ellis <tensiontype at hotmail.com>
>>> Cc: Synth-diy Mailing List <synth-diy at synth-diy.org>
>>> Subject: Re: [sdiy] New TI 5532
>>>  
>>> Would have been better if they'd just said use the OPA1678 which is moreorless drop-in for SMT versions.
>>> 
>>> There are several Chinese suppliers of real 5532 clones in DIP-8 if you need them.  The ones from COSINE are definitely drop in if you're worried.  Haven't tried the other suppliers.
>>> 
>>> 
>>>  
>>> From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Sean Ellis via Synth-diy <synth-diy at synth-diy.org>
>>> Sent: 07 May 2026 14:36
>>> Cc: Synth-diy Mailing List <synth-diy at synth-diy.org>
>>> Subject: [sdiy] New TI 5532
>>>  
>>> Just saw this thread, not sure if it was shared here. https://groupdiy.com/threads/the-new-ti-5532-chips-are-not-5532s-weve-used-for-decades.93707/
>>> ________________________________________________________
>>> This is the Synth-diy mailing list
>>> Submit email to: Synth-diy at synth-diy.org
>>> View archive at: https://synth-diy.org/pipermail/synth-diy/
>>> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
>>> Selling or trading? Use marketplace at synth-diy.org
>> 
>> ________________________________________________________
>> This is the Synth-diy mailing list
>> Submit email to: Synth-diy at synth-diy.org
>> View archive at: https://synth-diy.org/pipermail/synth-diy/
>> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
>> Selling or trading? Use marketplace at synth-diy.org
> 

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From tom at electricdruid.net  Fri May  8 14:09:07 2026
From: tom at electricdruid.net (Tom Wiltshire)
Date: Fri, 8 May 2026 13:09:07 +0100
Subject: [sdiy] New TI 5532
In-Reply-To: <7324A7F3-37BF-4026-9BAC-FB6DB1100BDC@scale.la>
References: <8d3fe6d4-c8b3-1062-7291-6e2def7847ec@gmx.de>
 <18829422-E546-4E52-996E-6418A58CBBE3@me.com>
 <SJ2P222MB08546D7633EC7ABE361F67D7C43E2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
 <CC810EB5-EDF4-46A0-919D-63FEFBB66F5E@ericframpton.com>
 <CWLP265MB7132A98FC7B498852479E80EDB3F2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <1c3518d6-7167-45a9-8743-c2a13907f1f5@gmx.com>
 <KL1PR02MB6663238C9F42EEA218A36A80B33F2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <C609B059-C63C-42C3-96D4-5B3C2DD47234@scale.la>
 <695987411.4638817.1778112830525@mail.yahoo.com>
 <CA+K2+DLMpwX-rMWOvMSCmSyA352xGTrDCJV8N3iUSS7h67_0uQ@mail.gmail.com>
 <KL1PR02MB66637AD64CF51D362A2696A3B33C2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <CWLP265MB7132D9F042297BFE165A1D64DB3C2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <SJ2P222MB085420F6DDC9472451780D3CC43C2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
 <13A16296-3ECB-4BBD-8248-CE0DE7D14A62@adambaby.com>
 <03912CAF-C04E-4510-AF5A-FF7D01EA2EA4@scale.la>
 <LV8P222MB0861FEE55FE34E24B798151BC43D2@LV8P222MB0861.NAMP222.PROD.OUTLOOK.COM>
 <7324A7F3-37BF-4026-9BAC-FB6DB1100BDC@scale.la>
Message-ID: <24813BAF-595E-45B9-B0F7-6597D8436558@electricdruid.net>

Alfa's clone, the AS3046, is widely available. They do make some other matched transistor pairs, but not uA726 unfortunately.

https://alfatriode.lv/eng/sc/application.php

> On 8 May 2026, at 12:49, Todd Sines via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> Great!
> You?ll still need a CA3046, not as hard to find as a ua726, but not as ubiquitous as a TL072 :)
> 
> 
> Todd
> 
>> On May 8, 2026, at 1:51?AM, el macaco <elmacaco at hotmail.com> wrote:
>> 
>> Thanks Todd!
>> 
>> That will do for the 2 that I want to have as spares!
>> 
>> Glad the SH-2 circuit ties the necessary pins together to be able to use this circuit.
>> 
>> Adam, I know, I?ve been here since ?99!  I actually had 2 spares I got in 2000, but sadly they were lost in a move.
>> 
>> We always find a way!
>> 
>> Ed
>> 
>> Get Outlook for iOS <https://aka.ms/o0ukef>
>> From: Todd Sines <sines_list at scale.la>
>> Sent: Thursday, May 7, 2026 7:21:06 PM
>> To: Adam (synthDIY) <synthdiy at adambaby.com>
>> Cc: el macaco <elmacaco at hotmail.com>; Synth-diy Mailing List <synth-diy at synth-diy.org>
>> Subject: Re: [sdiy] New TI 5532
>>  
>> There?s this ( have a few for some B208Rs I made)
>> https://www.portabellabz.be/pa726.html <https://www.portabellabz.be/pa726.html>
>> 
>> I bought these, but have been too chicken to try them
>> https://www.utsource.net/itm/p/327411.html <https://www.utsource.net/itm/p/327411.html>
>> 
>> (As you can see here)
>> https://www.modwiggler.com/forum/viewtopic.php?t=194541 <https://www.modwiggler.com/forum/viewtopic.php?t=194541>
>> 
>> More discussion, featuring Mike Peake, who should know what?s up
>> https://modwiggler.com/forum/viewtopic.php?t=150851 <https://modwiggler.com/forum/viewtopic.php?t=150851>
>> https://www.modwiggler.com/forum/viewtopic.php?t=76091 <https://www.modwiggler.com/forum/viewtopic.php?t=76091>
>> 
>>> On May 7, 2026, at 7:48?PM, Adam (synthDIY) <synthdiy at adambaby.com> wrote:
>>> 
>>> 
>>> 
>>>> On 8 May 2026, at 03:53, el macaco via Synth-diy <synth-diy at synth-diy.org> wrote:
>>>> 
>>>> As a side question, what?s a good replacement for the uA726?
>>> 
>>> 
>>> People have been asking that for decades!!!!
>>> 
>>> 
>>> A
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>>> 
>>>> Want a couple just in case.
>>>> 
>>>> Thanks,
>>>> 
>>>> Ed
>>>> 
>>>> Get Outlook for iOS <https://aka.ms/o0ukef>
>>>> From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Mike Bryant <mbryant at futurehorizons.com>
>>>> Sent: Thursday, May 7, 2026 11:27:00 AM
>>>> To: Sean Ellis <tensiontype at hotmail.com>
>>>> Cc: Synth-diy Mailing List <synth-diy at synth-diy.org>
>>>> Subject: Re: [sdiy] New TI 5532
>>>>  
>>>> Would have been better if they'd just said use the OPA1678 which is moreorless drop-in for SMT versions.
>>>> 
>>>> There are several Chinese suppliers of real 5532 clones in DIP-8 if you need them.  The ones from COSINE are definitely drop in if you're worried.  Haven't tried the other suppliers.
>>>> 
>>>> 
>>>> From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Sean Ellis via Synth-diy <synth-diy at synth-diy.org>
>>>> Sent: 07 May 2026 14:36
>>>> Cc: Synth-diy Mailing List <synth-diy at synth-diy.org>
>>>> Subject: [sdiy] New TI 5532
>>>>  
>>>> Just saw this thread, not sure if it was shared here. https://groupdiy.com/threads/the-new-ti-5532-chips-are-not-5532s-weve-used-for-decades.93707/ <https://groupdiy.com/threads/the-new-ti-5532-chips-are-not-5532s-weve-used-for-decades.93707/>________________________________________________________
>>>> This is the Synth-diy mailing list
>>>> Submit email to: Synth-diy at synth-diy.org
>>>> View archive at: https://synth-diy.org/pipermail/synth-diy/
>>>> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
>>>> Selling or trading? Use marketplace at synth-diy.org
>>> 
>>> ________________________________________________________
>>> This is the Synth-diy mailing list
>>> Submit email to: Synth-diy at synth-diy.org
>>> View archive at: https://synth-diy.org/pipermail/synth-diy/
>>> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
>>> Selling or trading? Use marketplace at synth-diy.org
>> 
> 
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org

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From thomas.hudson7 at icloud.com  Sat May  9 00:48:59 2026
From: thomas.hudson7 at icloud.com (Thomas Hudson)
Date: Fri, 8 May 2026 18:48:59 -0400
Subject: [sdiy] Burr Brown OPA2134PA DIP
Message-ID: <0E909412-3FBC-4F15-8136-6057F444ABE8@icloud.com>

Sorry if this is not on topic, but I need the DIP version of this chip, but apparently there are a lot of counterfeits floating around, even on Amazon. Does anyone have a reliable source for the DIP version of this opamp?

TIA



From mbryant at futurehorizons.com  Sat May  9 01:00:35 2026
From: mbryant at futurehorizons.com (Mike Bryant)
Date: Fri, 8 May 2026 23:00:35 +0000
Subject: [sdiy] Burr Brown OPA2134PA DIP
In-Reply-To: <0E909412-3FBC-4F15-8136-6057F444ABE8@icloud.com>
References: <0E909412-3FBC-4F15-8136-6057F444ABE8@icloud.com>
Message-ID: <LO6P265MB713370313DD9D8276DD81A86DB3D2@LO6P265MB7133.GBRP265.PROD.OUTLOOK.COM>

LCSC is reliable source of the DIP version.
But do you REALLY need this op-amp ?  It's expensive for what it is with lots of alternatives nowadays.
________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Thomas Hudson via Synth-diy <synth-diy at synth-diy.org>
Sent: 08 May 2026 23:48
To: Synth DIY <synth-diy at synth-diy.org>
Subject: [sdiy] Burr Brown OPA2134PA DIP

Sorry if this is not on topic, but I need the DIP version of this chip, but apparently there are a lot of counterfeits floating around, even on Amazon. Does anyone have a reliable source for the DIP version of this opamp?

TIA


________________________________________________________
This is the Synth-diy mailing list
Submit email to: Synth-diy at synth-diy.org
View archive at: https://synth-diy.org/pipermail/synth-diy/
Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
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From thomas.hudson7 at icloud.com  Sat May  9 01:01:27 2026
From: thomas.hudson7 at icloud.com (Thomas Hudson)
Date: Fri, 8 May 2026 19:01:27 -0400
Subject: [sdiy] Burr Brown OPA2134PA DIP
In-Reply-To: <LO6P265MB713370313DD9D8276DD81A86DB3D2@LO6P265MB7133.GBRP265.PROD.OUTLOOK.COM>
References: <0E909412-3FBC-4F15-8136-6057F444ABE8@icloud.com>
 <LO6P265MB713370313DD9D8276DD81A86DB3D2@LO6P265MB7133.GBRP265.PROD.OUTLOOK.COM>
Message-ID: <51D8C5EA-F1DE-4CE3-AE7B-D0F621C247B0@icloud.com>

Are  there drop-in replacements?

> On May 8, 2026, at 7:00?PM, Mike Bryant <mbryant at futurehorizons.com> wrote:
> 
> LCSC is reliable source of the DIP version. 
> But do you REALLY need this op-amp ?  It's expensive for what it is with lots of alternatives nowadays.
> From: Synth-diy <synth-diy-bounces at synth-diy.org <mailto:synth-diy-bounces at synth-diy.org>> on behalf of Thomas Hudson via Synth-diy <synth-diy at synth-diy.org <mailto:synth-diy at synth-diy.org>>
> Sent: 08 May 2026 23:48
> To: Synth DIY <synth-diy at synth-diy.org <mailto:synth-diy at synth-diy.org>>
> Subject: [sdiy] Burr Brown OPA2134PA DIP
>  
> Sorry if this is not on topic, but I need the DIP version of this chip, but apparently there are a lot of counterfeits floating around, even on Amazon. Does anyone have a reliable source for the DIP version of this opamp?
> 
> TIA
> 
> 
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org <mailto:marketplace at synth-diy.org>
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From mbryant at futurehorizons.com  Sat May  9 01:08:48 2026
From: mbryant at futurehorizons.com (Mike Bryant)
Date: Fri, 8 May 2026 23:08:48 +0000
Subject: [sdiy] Burr Brown OPA2134PA DIP
In-Reply-To: <51D8C5EA-F1DE-4CE3-AE7B-D0F621C247B0@icloud.com>
References: <0E909412-3FBC-4F15-8136-6057F444ABE8@icloud.com>
 <LO6P265MB713370313DD9D8276DD81A86DB3D2@LO6P265MB7133.GBRP265.PROD.OUTLOOK.COM>
 <51D8C5EA-F1DE-4CE3-AE7B-D0F621C247B0@icloud.com>
Message-ID: <LO6P265MB713369EE314B8207F3559ED0DB3D2@LO6P265MB7133.GBRP265.PROD.OUTLOOK.COM>

OPA1678 should drop in and better in almost every application.
________________________________
From: Thomas Hudson <thomas.hudson7 at icloud.com>
Sent: 09 May 2026 00:01
To: Mike Bryant <mbryant at futurehorizons.com>
Cc: Synth DIY <synth-diy at synth-diy.org>
Subject: Re: [sdiy] Burr Brown OPA2134PA DIP

Are  there drop-in replacements?

On May 8, 2026, at 7:00?PM, Mike Bryant <mbryant at futurehorizons.com> wrote:

LCSC is reliable source of the DIP version.
But do you REALLY need this op-amp ?  It's expensive for what it is with lots of alternatives nowadays.
________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org<mailto:synth-diy-bounces at synth-diy.org>> on behalf of Thomas Hudson via Synth-diy <synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org>>
Sent: 08 May 2026 23:48
To: Synth DIY <synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org>>
Subject: [sdiy] Burr Brown OPA2134PA DIP

Sorry if this is not on topic, but I need the DIP version of this chip, but apparently there are a lot of counterfeits floating around, even on Amazon. Does anyone have a reliable source for the DIP version of this opamp?

TIA


________________________________________________________
This is the Synth-diy mailing list
Submit email to: Synth-diy at synth-diy.org<mailto:Synth-diy at synth-diy.org>
View archive at: https://synth-diy.org/pipermail/synth-diy/
Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
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From thomas.hudson7 at icloud.com  Sat May  9 01:10:22 2026
From: thomas.hudson7 at icloud.com (Thomas Hudson)
Date: Fri, 8 May 2026 19:10:22 -0400
Subject: [sdiy] Burr Brown OPA2134PA DIP
In-Reply-To: <LO6P265MB713369EE314B8207F3559ED0DB3D2@LO6P265MB7133.GBRP265.PROD.OUTLOOK.COM>
References: <0E909412-3FBC-4F15-8136-6057F444ABE8@icloud.com>
 <LO6P265MB713370313DD9D8276DD81A86DB3D2@LO6P265MB7133.GBRP265.PROD.OUTLOOK.COM>
 <51D8C5EA-F1DE-4CE3-AE7B-D0F621C247B0@icloud.com>
 <LO6P265MB713369EE314B8207F3559ED0DB3D2@LO6P265MB7133.GBRP265.PROD.OUTLOOK.COM>
Message-ID: <9E50E3E8-1B71-4B4F-8718-F6C65623B942@icloud.com>

Thanks!

> On May 8, 2026, at 7:08?PM, Mike Bryant <mbryant at futurehorizons.com> wrote:
> 
> OPA1678 s

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From mbryant at futurehorizons.com  Sat May  9 01:11:25 2026
From: mbryant at futurehorizons.com (Mike Bryant)
Date: Fri, 8 May 2026 23:11:25 +0000
Subject: [sdiy] Burr Brown OPA2134PA DIP
In-Reply-To: <LO6P265MB713369EE314B8207F3559ED0DB3D2@LO6P265MB7133.GBRP265.PROD.OUTLOOK.COM>
References: <0E909412-3FBC-4F15-8136-6057F444ABE8@icloud.com>
 <LO6P265MB713370313DD9D8276DD81A86DB3D2@LO6P265MB7133.GBRP265.PROD.OUTLOOK.COM>
 <51D8C5EA-F1DE-4CE3-AE7B-D0F621C247B0@icloud.com>
 <LO6P265MB713369EE314B8207F3559ED0DB3D2@LO6P265MB7133.GBRP265.PROD.OUTLOOK.COM>
Message-ID: <LO6P265MB71339B9AB6E4E44CD531AC64DB3D2@LO6P265MB7133.GBRP265.PROD.OUTLOOK.COM>

But you'll need a SMD to DIP adapter.  None of the modern opamps are available in DIP

________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Mike Bryant <mbryant at futurehorizons.com>
Sent: 09 May 2026 00:08
To: Thomas Hudson <thomas.hudson7 at icloud.com>
Cc: Synth DIY <synth-diy at synth-diy.org>
Subject: Re: [sdiy] Burr Brown OPA2134PA DIP

OPA1678 should drop in and better in almost every application.
________________________________
From: Thomas Hudson <thomas.hudson7 at icloud.com>
Sent: 09 May 2026 00:01
To: Mike Bryant <mbryant at futurehorizons.com>
Cc: Synth DIY <synth-diy at synth-diy.org>
Subject: Re: [sdiy] Burr Brown OPA2134PA DIP

Are  there drop-in replacements?

On May 8, 2026, at 7:00?PM, Mike Bryant <mbryant at futurehorizons.com> wrote:

LCSC is reliable source of the DIP version.
But do you REALLY need this op-amp ?  It's expensive for what it is with lots of alternatives nowadays.
________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org<mailto:synth-diy-bounces at synth-diy.org>> on behalf of Thomas Hudson via Synth-diy <synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org>>
Sent: 08 May 2026 23:48
To: Synth DIY <synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org>>
Subject: [sdiy] Burr Brown OPA2134PA DIP

Sorry if this is not on topic, but I need the DIP version of this chip, but apparently there are a lot of counterfeits floating around, even on Amazon. Does anyone have a reliable source for the DIP version of this opamp?

TIA


________________________________________________________
This is the Synth-diy mailing list
Submit email to: Synth-diy at synth-diy.org<mailto:Synth-diy at synth-diy.org>
View archive at: https://synth-diy.org/pipermail/synth-diy/
Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
Selling or trading? Use marketplace at synth-diy.org<mailto:marketplace at synth-diy.org>

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From thomas.hudson7 at icloud.com  Sat May  9 01:14:03 2026
From: thomas.hudson7 at icloud.com (Thomas Hudson)
Date: Fri, 8 May 2026 19:14:03 -0400
Subject: [sdiy] Burr Brown OPA2134PA DIP
In-Reply-To: <LO6P265MB71339B9AB6E4E44CD531AC64DB3D2@LO6P265MB7133.GBRP265.PROD.OUTLOOK.COM>
References: <0E909412-3FBC-4F15-8136-6057F444ABE8@icloud.com>
 <LO6P265MB713370313DD9D8276DD81A86DB3D2@LO6P265MB7133.GBRP265.PROD.OUTLOOK.COM>
 <51D8C5EA-F1DE-4CE3-AE7B-D0F621C247B0@icloud.com>
 <LO6P265MB713369EE314B8207F3559ED0DB3D2@LO6P265MB7133.GBRP265.PROD.OUTLOOK.COM>
 <LO6P265MB71339B9AB6E4E44CD531AC64DB3D2@LO6P265MB7133.GBRP265.PROD.OUTLOOK.COM>
Message-ID: <D1A4F41A-4916-4B06-8AE5-46C0A62783DE@icloud.com>

I?m 67 with bad eyesight and not so steady hands, but I guess it?s time for me to learn how to do SMD. Any advice for how to get started?

> On May 8, 2026, at 7:11?PM, Mike Bryant <mbryant at futurehorizons.com> wrote:
> 
> But you'll need a SMD to DIP adapter.  None of the modern opamps are available in DIP
> 
> From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Mike Bryant <mbryant at futurehorizons.com>
> Sent: 09 May 2026 00:08
> To: Thomas Hudson <thomas.hudson7 at icloud.com>
> Cc: Synth DIY <synth-diy at synth-diy.org>
> Subject: Re: [sdiy] Burr Brown OPA2134PA DIP
>  
> OPA1678 should drop in and better in almost every application.
> From: Thomas Hudson <thomas.hudson7 at icloud.com>
> Sent: 09 May 2026 00:01
> To: Mike Bryant <mbryant at futurehorizons.com>
> Cc: Synth DIY <synth-diy at synth-diy.org>
> Subject: Re: [sdiy] Burr Brown OPA2134PA DIP
>  
> Are  there drop-in replacements?
> 
>> On May 8, 2026, at 7:00?PM, Mike Bryant <mbryant at futurehorizons.com> wrote:
>> 
>> LCSC is reliable source of the DIP version. 
>> But do you REALLY need this op-amp ?  It's expensive for what it is with lots of alternatives nowadays.
>>  
>> From: Synth-diy <synth-diy-bounces at synth-diy.org <mailto:synth-diy-bounces at synth-diy.org>> on behalf of Thomas Hudson via Synth-diy <synth-diy at synth-diy.org <mailto:synth-diy at synth-diy.org>>
>> Sent: 08 May 2026 23:48
>> To: Synth DIY <synth-diy at synth-diy.org <mailto:synth-diy at synth-diy.org>>
>> Subject: [sdiy] Burr Brown OPA2134PA DIP
>>  
>> Sorry if this is not on topic, but I need the DIP version of this chip, but apparently there are a lot of counterfeits floating around, even on Amazon. Does anyone have a reliable source for the DIP version of this opamp?
>> 
>> TIA
>> 
>> 
>> ________________________________________________________
>> This is the Synth-diy mailing list
>> Submit email to: Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
>> View archive at: https://synth-diy.org/pipermail/synth-diy/
>> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
>> Selling or trading? Use marketplace at synth-diy.org <mailto:marketplace at synth-diy.org>
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From mbryant at futurehorizons.com  Sat May  9 01:43:54 2026
From: mbryant at futurehorizons.com (Mike Bryant)
Date: Fri, 8 May 2026 23:43:54 +0000
Subject: [sdiy] Burr Brown OPA2134PA DIP
In-Reply-To: <D1A4F41A-4916-4B06-8AE5-46C0A62783DE@icloud.com>
References: <0E909412-3FBC-4F15-8136-6057F444ABE8@icloud.com>
 <LO6P265MB713370313DD9D8276DD81A86DB3D2@LO6P265MB7133.GBRP265.PROD.OUTLOOK.COM>
 <51D8C5EA-F1DE-4CE3-AE7B-D0F621C247B0@icloud.com>
 <LO6P265MB713369EE314B8207F3559ED0DB3D2@LO6P265MB7133.GBRP265.PROD.OUTLOOK.COM>
 <LO6P265MB71339B9AB6E4E44CD531AC64DB3D2@LO6P265MB7133.GBRP265.PROD.OUTLOOK.COM>
 <D1A4F41A-4916-4B06-8AE5-46C0A62783DE@icloud.com>
Message-ID: <CWLP265MB7132A3E44022C7C9127CF430DB3D2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>

https://learn.sparkfun.com/tutorials/8-pin-soic-to-dip-adapter-hookup-guide/all
________________________________
From: Thomas Hudson <thomas.hudson7 at icloud.com>
Sent: 09 May 2026 00:14
To: Mike Bryant <mbryant at futurehorizons.com>
Cc: Synth DIY <synth-diy at synth-diy.org>
Subject: Re: [sdiy] Burr Brown OPA2134PA DIP

I?m 67 with bad eyesight and not so steady hands, but I guess it?s time for me to learn how to do SMD. Any advice for how to get started?

On May 8, 2026, at 7:11?PM, Mike Bryant <mbryant at futurehorizons.com> wrote:

But you'll need a SMD to DIP adapter.  None of the modern opamps are available in DIP

________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Mike Bryant <mbryant at futurehorizons.com>
Sent: 09 May 2026 00:08
To: Thomas Hudson <thomas.hudson7 at icloud.com>
Cc: Synth DIY <synth-diy at synth-diy.org>
Subject: Re: [sdiy] Burr Brown OPA2134PA DIP

OPA1678 should drop in and better in almost every application.
________________________________
From: Thomas Hudson <thomas.hudson7 at icloud.com>
Sent: 09 May 2026 00:01
To: Mike Bryant <mbryant at futurehorizons.com>
Cc: Synth DIY <synth-diy at synth-diy.org>
Subject: Re: [sdiy] Burr Brown OPA2134PA DIP

Are  there drop-in replacements?

On May 8, 2026, at 7:00?PM, Mike Bryant <mbryant at futurehorizons.com> wrote:

LCSC is reliable source of the DIP version.
But do you REALLY need this op-amp ?  It's expensive for what it is with lots of alternatives nowadays.
________________________________

From: Synth-diy <synth-diy-bounces at synth-diy.org<mailto:synth-diy-bounces at synth-diy.org>> on behalf of Thomas Hudson via Synth-diy <synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org>>
Sent: 08 May 2026 23:48
To: Synth DIY <synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org>>
Subject: [sdiy] Burr Brown OPA2134PA DIP

Sorry if this is not on topic, but I need the DIP version of this chip, but apparently there are a lot of counterfeits floating around, even on Amazon. Does anyone have a reliable source for the DIP version of this opamp?

TIA


________________________________________________________
This is the Synth-diy mailing list
Submit email to: Synth-diy at synth-diy.org<mailto:Synth-diy at synth-diy.org>
View archive at: https://synth-diy.org/pipermail/synth-diy/
Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
Selling or trading? Use marketplace at synth-diy.org<mailto:marketplace at synth-diy.org>

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From fluxmonk at gmail.com  Sat May  9 02:01:18 2026
From: fluxmonk at gmail.com (bbob)
Date: Fri, 8 May 2026 20:01:18 -0400
Subject: [sdiy] Burr Brown OPA2134PA DIP
In-Reply-To: <D1A4F41A-4916-4B06-8AE5-46C0A62783DE@icloud.com>
References: <0E909412-3FBC-4F15-8136-6057F444ABE8@icloud.com>
 <LO6P265MB713370313DD9D8276DD81A86DB3D2@LO6P265MB7133.GBRP265.PROD.OUTLOOK.COM>
 <51D8C5EA-F1DE-4CE3-AE7B-D0F621C247B0@icloud.com>
 <LO6P265MB713369EE314B8207F3559ED0DB3D2@LO6P265MB7133.GBRP265.PROD.OUTLOOK.COM>
 <LO6P265MB71339B9AB6E4E44CD531AC64DB3D2@LO6P265MB7133.GBRP265.PROD.OUTLOOK.COM>
 <D1A4F41A-4916-4B06-8AE5-46C0A62783DE@icloud.com>
Message-ID: <CABbX2d_GMG=9dnAev8=+7_mXsruUU2b2VPK+_F436rPNkYuKig@mail.gmail.com>

I?m a couple years older but otherwise same? seemed so daunting, but after
the first build I I wished I?d jumped in sooner

On Fri, May 8, 2026 at 7:26?PM Thomas Hudson via Synth-diy <
synth-diy at synth-diy.org> wrote:

> I?m 67 with bad eyesight and not so steady hands, but I guess it?s time
> for me to learn how to do SMD. Any advice for how to get started?
>
> On May 8, 2026, at 7:11?PM, Mike Bryant <mbryant at futurehorizons.com>
> wrote:
>
> But you'll need a SMD to DIP adapter.  None of the modern opamps are
> available in DIP
>
> ------------------------------
> *From:* Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Mike
> Bryant <mbryant at futurehorizons.com>
> *Sent:* 09 May 2026 00:08
> *To:* Thomas Hudson <thomas.hudson7 at icloud.com>
> *Cc:* Synth DIY <synth-diy at synth-diy.org>
> *Subject:* Re: [sdiy] Burr Brown OPA2134PA DIP
>
> OPA1678 should drop in and better in almost every application.
> ------------------------------
> *From:* Thomas Hudson <thomas.hudson7 at icloud.com>
> *Sent:* 09 May 2026 00:01
> *To:* Mike Bryant <mbryant at futurehorizons.com>
> *Cc:* Synth DIY <synth-diy at synth-diy.org>
> *Subject:* Re: [sdiy] Burr Brown OPA2134PA DIP
>
> Are  there drop-in replacements?
>
> On May 8, 2026, at 7:00?PM, Mike Bryant <mbryant at futurehorizons.com>
> wrote:
>
> LCSC is reliable source of the DIP version.
> But do you REALLY need this op-amp ?  It's expensive for what it is with
> lots of alternatives nowadays.
> ------------------------------
>
> *From:* Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Thomas
> Hudson via Synth-diy <synth-diy at synth-diy.org>
> *Sent:* 08 May 2026 23:48
> *To:* Synth DIY <synth-diy at synth-diy.org>
> *Subject:* [sdiy] Burr Brown OPA2134PA DIP
>
> Sorry if this is not on topic, but I need the DIP version of this chip,
> but apparently there are a lot of counterfeits floating around, even on
> Amazon. Does anyone have a reliable source for the DIP version of this
> opamp?
>
> TIA
>
>
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org
>
>
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org
>
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From rrsounds at aol.com  Sat May  9 13:52:20 2026
From: rrsounds at aol.com (rrsounds)
Date: Sat, 9 May 2026 13:52:20 +0200
Subject: [sdiy] Burr Brown OPA2134PA DIP
In-Reply-To: <D1A4F41A-4916-4B06-8AE5-46C0A62783DE@icloud.com>
References: <D1A4F41A-4916-4B06-8AE5-46C0A62783DE@icloud.com>
Message-ID: <DBE689D9-278B-4954-B8C4-D3CE2F842773@aol.com>

I don?t think anyone does SMD soldering without some form (or, my case, forms) of magnification.
Buy an LCD desk microscope and a head-mounted, lighted magnifier visor. And get started! I also suggest investing in a hot air soldering station, and a tube of squeeze-out solder paste.
I?m 70 with similar sight problems. It?s doable.
Have at it!!

David Reaves
David Reaves Audio, LLC

Sent from my iPhone

> On May 9, 2026, at 01:24, Thomas Hudson via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> I?m 67 with bad eyesight and not so steady hands, but I guess it?s time for me to learn how to do SMD. Any advice for how to get started?



From mbryant at futurehorizons.com  Sat May  9 14:13:52 2026
From: mbryant at futurehorizons.com (Mike Bryant)
Date: Sat, 9 May 2026 12:13:52 +0000
Subject: [sdiy] Burr Brown OPA2134PA DIP
In-Reply-To: <DBE689D9-278B-4954-B8C4-D3CE2F842773@aol.com>
References: <D1A4F41A-4916-4B06-8AE5-46C0A62783DE@icloud.com>
 <DBE689D9-278B-4954-B8C4-D3CE2F842773@aol.com>
Message-ID: <CWLP265MB71325F839DD037D604FA0DD9DB3A2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>

For a complete PCB yes, but for the OP just put some solder paste on the adapter, place the IC in roughly the right place and shove it in the oven for a few minutes.  It will centre itself up.

I've never tried an air frier - does anyone know if they work ?
________________________________
From: rrsounds <rrsounds at aol.com>
Sent: 09 May 2026 12:52
To: Thomas Hudson <thomas.hudson7 at icloud.com>
Cc: Mike Bryant <mbryant at futurehorizons.com>; Synth DIY <synth-diy at synth-diy.org>
Subject: Re: [sdiy] Burr Brown OPA2134PA DIP

I don?t think anyone does SMD soldering without some form (or, my case, forms) of magnification.
Buy an LCD desk microscope and a head-mounted, lighted magnifier visor. And get started! I also suggest investing in a hot air soldering station, and a tube of squeeze-out solder paste.
I?m 70 with similar sight problems. It?s doable.
Have at it!!

David Reaves
David Reaves Audio, LLC

Sent from my iPhone

> On May 9, 2026, at 01:24, Thomas Hudson via Synth-diy <synth-diy at synth-diy.org> wrote:
>
> I?m 67 with bad eyesight and not so steady hands, but I guess it?s time for me to learn how to do SMD. Any advice for how to get started?

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From dh at atoav.com  Sat May  9 14:33:00 2026
From: dh at atoav.com (David Huss)
Date: Sat, 09 May 2026 12:33:00 +0000
Subject: [sdiy] Burr Brown OPA2134PA DIP
In-Reply-To: <CWLP265MB71325F839DD037D604FA0DD9DB3A2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
References: <D1A4F41A-4916-4B06-8AE5-46C0A62783DE@icloud.com>
 <DBE689D9-278B-4954-B8C4-D3CE2F842773@aol.com>
 <CWLP265MB71325F839DD037D604FA0DD9DB3A2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
Message-ID: <2CACEE9E-E601-451D-A881-FCC4D183444A@atoav.com>

If you want to use the air frier for food afterwards, I would advice against that idea.

On May 9, 2026 12:13:52 PM UTC, Mike Bryant <mbryant at futurehorizons.com> wrote:
>For a complete PCB yes, but for the OP just put some solder paste on the adapter, place the IC in roughly the right place and shove it in the oven for a few minutes.  It will centre itself up.
>
>I've never tried an air frier - does anyone know if they work ?
>________________________________
>From: rrsounds <rrsounds at aol.com>
>Sent: 09 May 2026 12:52
>To: Thomas Hudson <thomas.hudson7 at icloud.com>
>Cc: Mike Bryant <mbryant at futurehorizons.com>; Synth DIY <synth-diy at synth-diy.org>
>Subject: Re: [sdiy] Burr Brown OPA2134PA DIP
>
>I don?t think anyone does SMD soldering without some form (or, my case, forms) of magnification.
>Buy an LCD desk microscope and a head-mounted, lighted magnifier visor. And get started! I also suggest investing in a hot air soldering station, and a tube of squeeze-out solder paste.
>I?m 70 with similar sight problems. It?s doable.
>Have at it!!
>
>David Reaves
>David Reaves Audio, LLC
>
>Sent from my iPhone
>
>> On May 9, 2026, at 01:24, Thomas Hudson via Synth-diy <synth-diy at synth-diy.org> wrote:
>>
>> I?m 67 with bad eyesight and not so steady hands, but I guess it?s time for me to learn how to do SMD. Any advice for how to get started?
>


From pete.hartman at gmail.com  Sat May  9 15:29:10 2026
From: pete.hartman at gmail.com (Pete Hartman)
Date: Sat, 9 May 2026 08:29:10 -0500
Subject: [sdiy] Burr Brown OPA2134PA DIP
In-Reply-To: <DBE689D9-278B-4954-B8C4-D3CE2F842773@aol.com>
References: <D1A4F41A-4916-4B06-8AE5-46C0A62783DE@icloud.com>
 <DBE689D9-278B-4954-B8C4-D3CE2F842773@aol.com>
Message-ID: <CACodTR-mKt0e=AfLddcz4HW4Fcccbtu5gdnwrGbY0+ZG_QAc3Q@mail.gmail.com>

On Sat, May 9, 2026 at 7:00?AM rrsounds via Synth-diy <
synth-diy at synth-diy.org> wrote:

> I don?t think anyone does SMD soldering without some form (or, my case,
> forms) of magnification.


Well maybe I'm the exception?  I have not found a comfortable and usable
form of magnification for the soldering itself.  Doing 0805 and soic I
generally haven't had any trouble without, despite being very nearsighted
all my life.  I do have a headset magnifier and a desktop USB microscope
but they're for inspection not soldering.


>
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From chris at chrismusic.de  Sat May  9 15:49:28 2026
From: chris at chrismusic.de (chris)
Date: Sat, 9 May 2026 15:49:28 +0200
Subject: [sdiy] Burr Brown OPA2134PA DIP
In-Reply-To: <CACodTR-mKt0e=AfLddcz4HW4Fcccbtu5gdnwrGbY0+ZG_QAc3Q@mail.gmail.com>
References: <D1A4F41A-4916-4B06-8AE5-46C0A62783DE@icloud.com>
 <DBE689D9-278B-4954-B8C4-D3CE2F842773@aol.com>
 <CACodTR-mKt0e=AfLddcz4HW4Fcccbtu5gdnwrGbY0+ZG_QAc3Q@mail.gmail.com>
Message-ID: <62343718-29ac-4af9-94b5-412ea8a83af1@chrismusic.de>

Same here. Nearsighted at arount 4.0, so for very close things I just 
take off my glasses.

Been doing SO-IC and as you said 0805, and the occasional 0603 for 
decoupling caps (love to have them as close as possible to the target).

The only magnification I use is a jewelers' magnifier for inspection and 
for reading tiny component labeling.


Chris



On 09/05/2026 15:29, Pete Hartman via Synth-diy wrote:
>
>
> On Sat, May 9, 2026 at 7:00?AM rrsounds via Synth-diy 
> <synth-diy at synth-diy.org> wrote:
>
>     I don?t think anyone does SMD soldering without some form (or, my
>     case, forms) of magnification.
>
>
> Well maybe I'm the exception?? I have not found a comfortable and 
> usable form of magnification for the soldering itself.? Doing 0805 and 
> soic I generally haven't had any trouble without, despite being very 
> nearsighted all my life.? I do have a headset magnifier and a desktop 
> USB microscope but they're for inspection not soldering.
>
>
>
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to:Synth-diy at synth-diy.org
> View archive at:https://synth-diy.org/pipermail/synth-diy/
> Check your settings at:https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Usemarketplace at synth-diy.org
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From tensiontype at hotmail.com  Sat May  9 16:22:10 2026
From: tensiontype at hotmail.com (Sean Ellis)
Date: Sat, 9 May 2026 14:22:10 +0000
Subject: [sdiy] Burr Brown OPA2134PA DIP
In-Reply-To: <CACodTR-mKt0e=AfLddcz4HW4Fcccbtu5gdnwrGbY0+ZG_QAc3Q@mail.gmail.com>
References: <D1A4F41A-4916-4B06-8AE5-46C0A62783DE@icloud.com>
 <DBE689D9-278B-4954-B8C4-D3CE2F842773@aol.com>
 <CACodTR-mKt0e=AfLddcz4HW4Fcccbtu5gdnwrGbY0+ZG_QAc3Q@mail.gmail.com>
Message-ID: <KL1PR02MB6663B452C6B084622AF7689CB33A2@KL1PR02MB6663.apcprd02.prod.outlook.com>

I went through a few sets of magnifiers before I found one's that worked for me, now they are like second nature to wear. I started with good quality box style ones, they were OK but had to be adjusted quite often and they all seem to lack in the lighting (the first style below). The I got used to the open frame style and got some good ones with ultra bright LEDs, these are so comfortable that you dont need to lift them to see normally after a while (second style). There's also the new handheld digital microscopes that are really interesting.
https://www.electrokit.com/en/forstoringsglasogon
https://www.neven7.eu/p/mg8200mc-magnifying-glasses-led-lighting
https://www.aliexpress.com/item/1005009086607832.html
________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Pete Hartman via Synth-diy <synth-diy at synth-diy.org>
Sent: Saturday, 9 May 2026 3:29 PM
To: rrsounds <rrsounds at aol.com>
Cc: Synth DIY <synth-diy at synth-diy.org>
Subject: Re: [sdiy] Burr Brown OPA2134PA DIP



On Sat, May 9, 2026 at 7:00?AM rrsounds via Synth-diy <synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org>> wrote:
I don?t think anyone does SMD soldering without some form (or, my case, forms) of magnification.

Well maybe I'm the exception?  I have not found a comfortable and usable form of magnification for the soldering itself.  Doing 0805 and soic I generally haven't had any trouble without, despite being very nearsighted all my life.  I do have a headset magnifier and a desktop USB microscope but they're for inspection not soldering.


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From grant at musictechnologiesgroup.com  Sat May  9 17:21:09 2026
From: grant at musictechnologiesgroup.com (grant musictechnologiesgroup.com)
Date: Sat, 9 May 2026 15:21:09 +0000
Subject: [sdiy] Burr Brown OPA2134PA DIP
In-Reply-To: <D1A4F41A-4916-4B06-8AE5-46C0A62783DE@icloud.com>
References: <0E909412-3FBC-4F15-8136-6057F444ABE8@icloud.com>
 <LO6P265MB713370313DD9D8276DD81A86DB3D2@LO6P265MB7133.GBRP265.PROD.OUTLOOK.COM>
 <51D8C5EA-F1DE-4CE3-AE7B-D0F621C247B0@icloud.com>
 <LO6P265MB713369EE314B8207F3559ED0DB3D2@LO6P265MB7133.GBRP265.PROD.OUTLOOK.COM>
 <LO6P265MB71339B9AB6E4E44CD531AC64DB3D2@LO6P265MB7133.GBRP265.PROD.OUTLOOK.COM>
 <D1A4F41A-4916-4B06-8AE5-46C0A62783DE@icloud.com>
Message-ID: <9fb23a48-7367-432b-ac0d-da6053e4b125@musictechnologiesgroup.com>

www.amscope.com<http://www.amscope.com> or similar

Get a 10x stereo lighted scope. If you can afford a second magnification, maybe something like a 10x and a 30x. The 30x you won't need very often though.

GB

On 5/8/2026 4:14 PM, Thomas Hudson via Synth-diy wrote:
I?m 67 with bad eyesight and not so steady hands, but I guess it?s time for me to learn how to do SMD. Any advice for how to get started?

On May 8, 2026, at 7:11?PM, Mike Bryant <mbryant at futurehorizons.com><mailto:mbryant at futurehorizons.com> wrote:

But you'll need a SMD to DIP adapter.  None of the modern opamps are available in DIP

________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org><mailto:synth-diy-bounces at synth-diy.org> on behalf of Mike Bryant <mbryant at futurehorizons.com><mailto:mbryant at futurehorizons.com>
Sent: 09 May 2026 00:08
To: Thomas Hudson <thomas.hudson7 at icloud.com><mailto:thomas.hudson7 at icloud.com>
Cc: Synth DIY <synth-diy at synth-diy.org><mailto:synth-diy at synth-diy.org>
Subject: Re: [sdiy] Burr Brown OPA2134PA DIP

OPA1678 should drop in and better in almost every application.
________________________________
From: Thomas Hudson <thomas.hudson7 at icloud.com><mailto:thomas.hudson7 at icloud.com>
Sent: 09 May 2026 00:01
To: Mike Bryant <mbryant at futurehorizons.com><mailto:mbryant at futurehorizons.com>
Cc: Synth DIY <synth-diy at synth-diy.org><mailto:synth-diy at synth-diy.org>
Subject: Re: [sdiy] Burr Brown OPA2134PA DIP

Are  there drop-in replacements?

On May 8, 2026, at 7:00?PM, Mike Bryant <mbryant at futurehorizons.com><mailto:mbryant at futurehorizons.com> wrote:

LCSC is reliable source of the DIP version.
But do you REALLY need this op-amp ?  It's expensive for what it is with lots of alternatives nowadays.
________________________________

From: Synth-diy <synth-diy-bounces at synth-diy.org<mailto:synth-diy-bounces at synth-diy.org>> on behalf of Thomas Hudson via Synth-diy <synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org>>
Sent: 08 May 2026 23:48
To: Synth DIY <synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org>>
Subject: [sdiy] Burr Brown OPA2134PA DIP

Sorry if this is not on topic, but I need the DIP version of this chip, but apparently there are a lot of counterfeits floating around, even on Amazon. Does anyone have a reliable source for the DIP version of this opamp?

TIA


________________________________________________________
This is the Synth-diy mailing list
Submit email to: Synth-diy at synth-diy.org<mailto:Synth-diy at synth-diy.org>
View archive at: https://synth-diy.org/pipermail/synth-diy/
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________________________________________________________
This is the Synth-diy mailing list
Submit email to: Synth-diy at synth-diy.org<mailto:Synth-diy at synth-diy.org>
View archive at: https://synth-diy.org/pipermail/synth-diy/
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From fanwander at mnet-online.de  Sat May  9 18:08:00 2026
From: fanwander at mnet-online.de (Florian Anwander)
Date: Sat, 9 May 2026 18:08:00 +0200
Subject: [sdiy] new 726 (WAS New TI 5532)
In-Reply-To: <03912CAF-C04E-4510-AF5A-FF7D01EA2EA4@scale.la>
References: <8d3fe6d4-c8b3-1062-7291-6e2def7847ec@gmx.de>
 <18829422-E546-4E52-996E-6418A58CBBE3@me.com>
 <SJ2P222MB08546D7633EC7ABE361F67D7C43E2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
 <CC810EB5-EDF4-46A0-919D-63FEFBB66F5E@ericframpton.com>
 <CWLP265MB7132A98FC7B498852479E80EDB3F2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <1c3518d6-7167-45a9-8743-c2a13907f1f5@gmx.com>
 <KL1PR02MB6663238C9F42EEA218A36A80B33F2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <C609B059-C63C-42C3-96D4-5B3C2DD47234@scale.la>
 <695987411.4638817.1778112830525@mail.yahoo.com>
 <CA+K2+DLMpwX-rMWOvMSCmSyA352xGTrDCJV8N3iUSS7h67_0uQ@mail.gmail.com>
 <KL1PR02MB66637AD64CF51D362A2696A3B33C2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <CWLP265MB7132D9F042297BFE165A1D64DB3C2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <SJ2P222MB085420F6DDC9472451780D3CC43C2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
 <13A16296-3ECB-4BBD-8248-CE0DE7D14A62@adambaby.com>
 <03912CAF-C04E-4510-AF5A-FF7D01EA2EA4@scale.la>
Message-ID: <fc307c66-60b6-40d5-9a28-1691ae44b091@mnet-online.de>

Am 08.05.26 um 02:21 schrieb Todd Sines via Synth-diy:
> I bought these, but have been too chicken to try them
> https://www.utsource.net/itm/p/327411.html
>
I used utsource 726 recently for the restoration of an Elektor Formant 
with success. I had bought them ten years ago, so I can't judge, whether 
they still sell working ones.
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From luther.rochester at gmail.com  Sat May  9 19:27:55 2026
From: luther.rochester at gmail.com (luther rochester)
Date: Sat, 9 May 2026 12:27:55 -0500
Subject: [sdiy] New TI 5532
In-Reply-To: <7324A7F3-37BF-4026-9BAC-FB6DB1100BDC@scale.la>
References: <7324A7F3-37BF-4026-9BAC-FB6DB1100BDC@scale.la>
Message-ID: <3BBE89DC-1235-4842-AFFC-87C1891E4DC2@gmail.com>

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From elmacaco at hotmail.com  Sun May 10 07:13:47 2026
From: elmacaco at hotmail.com (el macaco)
Date: Sun, 10 May 2026 05:13:47 +0000
Subject: [sdiy] New TI 5532
In-Reply-To: <3BBE89DC-1235-4842-AFFC-87C1891E4DC2@gmail.com>
References: <7324A7F3-37BF-4026-9BAC-FB6DB1100BDC@scale.la>
 <3BBE89DC-1235-4842-AFFC-87C1891E4DC2@gmail.com>
Message-ID: <SJ2P222MB08540E171AFA64D758F80A90C43B2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>

That?s much simpler and cheaper,

Thanks Luther!

Ed

Get Outlook for iOS<https://aka.ms/o0ukef>
________________________________
From: luther rochester <luther.rochester at gmail.com>
Sent: Saturday, May 9, 2026 12:27:55 PM
To: Todd Sines <sines_list at scale.la>
Cc: el macaco <elmacaco at hotmail.com>; Synth-diy Mailing List <synth-diy at synth-diy.org>
Subject: Re: [sdiy] New TI 5532

i just saw MEMS has a 726 replacement now stateside as well as a few others:

<https://electricmusicstore.net/collections/in-stock>
In-Stock<https://electricmusicstore.net/collections/in-stock>
electricmusicstore.net<https://electricmusicstore.net/collections/in-stock>
[logo.png]<https://electricmusicstore.net/collections/in-stock>

luther


On May 8, 2026, at 6:52?AM, Todd Sines via Synth-diy <synth-diy at synth-diy.org> wrote:

?Great!
You?ll still need a CA3046, not as hard to find as a ua726, but not as ubiquitous as a TL072 :)


Todd

On May 8, 2026, at 1:51?AM, el macaco <elmacaco at hotmail.com> wrote:

Thanks Todd!

That will do for the 2 that I want to have as spares!

Glad the SH-2 circuit ties the necessary pins together to be able to use this circuit.

Adam, I know, I?ve been here since ?99!  I actually had 2 spares I got in 2000, but sadly they were lost in a move.

We always find a way!

Ed

Get Outlook for iOS<https://aka.ms/o0ukef>
________________________________
From: Todd Sines <sines_list at scale.la>
Sent: Thursday, May 7, 2026 7:21:06 PM
To: Adam (synthDIY) <synthdiy at adambaby.com>
Cc: el macaco <elmacaco at hotmail.com>; Synth-diy Mailing List <synth-diy at synth-diy.org>
Subject: Re: [sdiy] New TI 5532

There?s this ( have a few for some B208Rs I made)
https://www.portabellabz.be/pa726.html

I bought these, but have been too chicken to try them
https://www.utsource.net/itm/p/327411.html

(As you can see here)
https://www.modwiggler.com/forum/viewtopic.php?t=194541

More discussion, featuring Mike Peake, who should know what?s up
https://modwiggler.com/forum/viewtopic.php?t=150851
https://www.modwiggler.com/forum/viewtopic.php?t=76091

On May 7, 2026, at 7:48?PM, Adam (synthDIY) <synthdiy at adambaby.com> wrote:



On 8 May 2026, at 03:53, el macaco via Synth-diy <synth-diy at synth-diy.org> wrote:

As a side question, what?s a good replacement for the uA726?


People have been asking that for decades!!!!


A



















Want a couple just in case.

Thanks,

Ed

Get Outlook for iOS<https://aka.ms/o0ukef>
________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Mike Bryant <mbryant at futurehorizons.com>
Sent: Thursday, May 7, 2026 11:27:00 AM
To: Sean Ellis <tensiontype at hotmail.com>
Cc: Synth-diy Mailing List <synth-diy at synth-diy.org>
Subject: Re: [sdiy] New TI 5532

Would have been better if they'd just said use the OPA1678 which is moreorless drop-in for SMT versions.

There are several Chinese suppliers of real 5532 clones in DIP-8 if you need them.  The ones from COSINE are definitely drop in if you're worried.  Haven't tried the other suppliers.


________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Sean Ellis via Synth-diy <synth-diy at synth-diy.org>
Sent: 07 May 2026 14:36
Cc: Synth-diy Mailing List <synth-diy at synth-diy.org>
Subject: [sdiy] New TI 5532

Just saw this thread, not sure if it was shared here. https://groupdiy.com/threads/the-new-ti-5532-chips-are-not-5532s-weve-used-for-decades.93707/
________________________________________________________
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Submit email to: Synth-diy at synth-diy.org
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________________________________________________________
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________________________________________________________
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From werner.fluegel at b-tu.de  Mon May 11 12:11:47 2026
From: werner.fluegel at b-tu.de (=?UTF-8?B?RmzDvGdlbCwgV2VybmVy?=)
Date: Mon, 11 May 2026 12:11:47 +0200
Subject: [sdiy] Burr Brown OPA2134PA DIP
In-Reply-To: <0E909412-3FBC-4F15-8136-6057F444ABE8@icloud.com>
References: <0E909412-3FBC-4F15-8136-6057F444ABE8@icloud.com>
Message-ID: <de3b2cf0-8759-f692-e0e0-09d2058ca840@b-tu.de>

Am 09.05.2026 um 00:48 schrieb Thomas Hudson via Synth-diy:
> Sorry if this is not on topic, but I need the DIP version of this chip, but apparently there are a lot of counterfeits floating around, even on Amazon. Does anyone have a reliable source for the DIP version of this opamp?

Both in Germany:

https://www.musikding.de/OPA2134PA

<https://www.reichelt.de/de/de/shop/produkt/2-kanal-audio-operationsverstaerker_20_v_s_8_mhz_dip-8-73934?search=OPA2134PA&>

-- 
mfG.

W.Fl?gel

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From thomas.hudson7 at icloud.com  Mon May 11 15:23:55 2026
From: thomas.hudson7 at icloud.com (Thomas Hudson)
Date: Mon, 11 May 2026 09:23:55 -0400
Subject: [sdiy] Burr Brown OPA2134PA DIP
In-Reply-To: <de3b2cf0-8759-f692-e0e0-09d2058ca840@b-tu.de>
References: <0E909412-3FBC-4F15-8136-6057F444ABE8@icloud.com>
 <de3b2cf0-8759-f692-e0e0-09d2058ca840@b-tu.de>
Message-ID: <74D26D16-15EF-4F57-8F36-7219955515F2@icloud.com>

Thanks. I hadn?t heard of these suppliers.

> On May 11, 2026, at 6:11?AM, Fl?gel, Werner via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> Am 09.05.2026 um 00:48 schrieb Thomas Hudson via Synth-diy:
>> Sorry if this is not on topic, but I need the DIP version of this chip, but apparently there are a lot of counterfeits floating around, even on Amazon. Does anyone have a reliable source for the DIP version of this opamp?
> 
> Both in Germany:
> 
> https://www.musikding.de/OPA2134PA
> 
> <https://www.reichelt.de/de/de/shop/produkt/2-kanal-audio-operationsverstaerker_20_v_s_8_mhz_dip-8-73934?search=OPA2134PA&>
> 
> -- 
> mfG.
> 
> W.Fl?gel
> 
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org



From ph at comcast.net  Mon May 11 19:20:17 2026
From: ph at comcast.net (p. hendricks)
Date: Mon, 11 May 2026 10:20:17 -0700
Subject: [sdiy] Burr Brown OPA2134PA DIP
In-Reply-To: <CACodTR-mKt0e=AfLddcz4HW4Fcccbtu5gdnwrGbY0+ZG_QAc3Q@mail.gmail.com>
References: <D1A4F41A-4916-4B06-8AE5-46C0A62783DE@icloud.com>
 <DBE689D9-278B-4954-B8C4-D3CE2F842773@aol.com>
 <CACodTR-mKt0e=AfLddcz4HW4Fcccbtu5gdnwrGbY0+ZG_QAc3Q@mail.gmail.com>
Message-ID: <8652a12b-44c7-46c2-a203-e1674154d046@comcast.net>

On 5/9/26 6:29 AM, Pete Hartman via Synth-diy wrote:
>
>
> On Sat, May 9, 2026 at 7:00?AM rrsounds via Synth-diy 
> <synth-diy at synth-diy.org> wrote:
>
>     I don?t think anyone does SMD soldering without some form (or, my
>     case, forms) of magnification.
>
>
> Well maybe I'm the exception?? I have not found a comfortable and 
> usable form of magnification for the soldering itself.? Doing 0805 and 
> soic I generally haven't had any trouble without, despite being very 
> nearsighted all my life.? I do have a headset magnifier and a desktop 
> USB microscope but they're for inspection not soldering.
>
I just use 3x reading glasses. Works well for me for 0805 at least.
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From mbryant at futurehorizons.com  Mon May 11 20:49:57 2026
From: mbryant at futurehorizons.com (Mike Bryant)
Date: Mon, 11 May 2026 18:49:57 +0000
Subject: [sdiy] Burr Brown OPA2134PA DIP
In-Reply-To: <8652a12b-44c7-46c2-a203-e1674154d046@comcast.net>
References: <D1A4F41A-4916-4B06-8AE5-46C0A62783DE@icloud.com>
 <DBE689D9-278B-4954-B8C4-D3CE2F842773@aol.com>
 <CACodTR-mKt0e=AfLddcz4HW4Fcccbtu5gdnwrGbY0+ZG_QAc3Q@mail.gmail.com>
 <8652a12b-44c7-46c2-a203-e1674154d046@comcast.net>
Message-ID: <CWLP265MB71326BF3DEA26F6731C19C03DB382@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>

  *
I just use 3x reading glasses. Works well for me for 0805 at least.

I just use JLCPCB ?

________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of p. hendricks via Synth-diy <synth-diy at synth-diy.org>
Sent: 11 May 2026 18:20
To: synth-diy at synth-diy.org <synth-diy at synth-diy.org>
Subject: Re: [sdiy] Burr Brown OPA2134PA DIP

On 5/9/26 6:29 AM, Pete Hartman via Synth-diy wrote:


On Sat, May 9, 2026 at 7:00?AM rrsounds via Synth-diy <synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org>> wrote:
I don?t think anyone does SMD soldering without some form (or, my case, forms) of magnification.

Well maybe I'm the exception?  I have not found a comfortable and usable form of magnification for the soldering itself.  Doing 0805 and soic I generally haven't had any trouble without, despite being very nearsighted all my life.  I do have a headset magnifier and a desktop USB microscope but they're for inspection not soldering.


I just use 3x reading glasses. Works well for me for 0805 at least.
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From admin at bugbrand.co.uk  Mon May 11 23:18:03 2026
From: admin at bugbrand.co.uk (Tom Bugs)
Date: Mon, 11 May 2026 22:18:03 +0100
Subject: [sdiy] Burr Brown OPA2134PA DIP
In-Reply-To: <CWLP265MB71325F839DD037D604FA0DD9DB3A2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
References: <D1A4F41A-4916-4B06-8AE5-46C0A62783DE@icloud.com>
 <DBE689D9-278B-4954-B8C4-D3CE2F842773@aol.com>
 <CWLP265MB71325F839DD037D604FA0DD9DB3A2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
Message-ID: <f371c7a5-6ae5-41f1-87d3-10fc3ad2a858@bugbrand.co.uk>

Given how cheese on toast ended with cheese spattered/melted all over 
the sides, I'd suggest the air part is not so suitable - but that's just 
a hunch.


On 09/05/2026 13:13, Mike Bryant wrote:
> For a complete PCB yes, but for the OP just put some solder paste on 
> the adapter, place the IC in roughly the right place and shove it in 
> the oven for a few minutes.? It will centre itself up.
>
> I've never tried an air frier - does anyone know if they work ?
> ------------------------------------------------------------------------
> *From:* rrsounds <rrsounds at aol.com>
> *Sent:* 09 May 2026 12:52
> *To:* Thomas Hudson <thomas.hudson7 at icloud.com>
> *Cc:* Mike Bryant <mbryant at futurehorizons.com>; Synth DIY 
> <synth-diy at synth-diy.org>
> *Subject:* Re: [sdiy] Burr Brown OPA2134PA DIP
> I don?t think anyone does SMD soldering without some form (or, my 
> case, forms) of magnification.
> Buy an LCD desk microscope and a head-mounted, lighted magnifier 
> visor. And get started! I also suggest investing in a hot air 
> soldering station, and a tube of squeeze-out solder paste.
> I?m 70 with similar sight problems. It?s doable.
> Have at it!!
>
> David Reaves
> David Reaves Audio, LLC
>
> Sent from my iPhone
>
> > On May 9, 2026, at 01:24, Thomas Hudson via Synth-diy 
> <synth-diy at synth-diy.org> wrote:
> >
> > I?m 67 with bad eyesight and not so steady hands, but I guess it?s 
> time for me to learn how to do SMD. Any advice for how to get started?
>
>
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to:Synth-diy at synth-diy.org
> View archive at:https://synth-diy.org/pipermail/synth-diy/
> Check your settings at:https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Usemarketplace at synth-diy.org

-- 
BugBrand LTD
UK company No. 07199808
VAT No. GB 988 2629 57
1 Ninetree Hill
BRISTOL BS1 3SB
United Kingdom
www.bugbrand.co.uk
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From ka4hjh at gmail.com  Mon May 11 23:26:04 2026
From: ka4hjh at gmail.com (Terry Bowman)
Date: Mon, 11 May 2026 17:26:04 -0400
Subject: [sdiy] How Bad Is Your Eyesight? (was Re:  Burr Brown OPA2134PA)
In-Reply-To: <62343718-29ac-4af9-94b5-412ea8a83af1@chrismusic.de>
References: <D1A4F41A-4916-4B06-8AE5-46C0A62783DE@icloud.com>
 <DBE689D9-278B-4954-B8C4-D3CE2F842773@aol.com>
 <CACodTR-mKt0e=AfLddcz4HW4Fcccbtu5gdnwrGbY0+ZG_QAc3Q@mail.gmail.com>
 <62343718-29ac-4af9-94b5-412ea8a83af1@chrismusic.de>
Message-ID: <A1A899F5-8093-45FA-901E-33626C98C827@gmail.com>


> On May 9, 2026, at 9:49?AM, chris <chris at chrismusic.de> wrote:
> Same here. Nearsighted at arount 4.0, so for very close things I just take off my glasses.
> 
To borrow a line from the Four Yorkshiremen sketch, "Luxury."  8D


First, I have very good news: I now qualify for cataract surgery. This means that soon I'll be able to see even better than with contact lenses, which I haven't been able to wear for literally 30 years.


Now for the old fogey part:

I've had glasses since I was 3.5 years old. My current prescription is around -15 sphere, -3.5 cylinder. Naturally, I have presbyopia as well which ruins my native ability to see things from an inch away. 

My lenses are made of the highest index resin there is and they're still thick but at least one side isn't convex anymore. There are no opticians 'round 'ere who can work with such an extreme prescription. The "wizards", as I call our old school opticians, could fit just about anything but they're both long gone. When I show my glasses to the bored optician at Walmort (very professional and over 40) she gets very excited and wants to know everything them. Fortunately, I worked at Perle Vision for five months and learned the whole biz so we're able to talk shop all day.

I also have an esotropia in my left eye which causes double vision. I've never been able use anything binocular because I can't get both eyes to look into the eyepieces at the same time. Working with a bundle of wires is a complete nightmare because of this even though I can see that close. Feeding the wires from an IN-14 Nixie tube into holes on a PC board is simply impossible. Someone else has to do it for me.  o_O

I carry a flashlight around. I use it to scan areas closely so that my left eye doesn't drift around, causing me to overlook plainly visible objects. I've also taken to using colors and putting large labels on drawers full of parts. The cabinets themselves are different colors so I won't make the mistake of looking at drawers in two different cabinets at the same time.

Then there are the floaters, lots of them.


I'm not trying to win the "who's got it the worst" contest here, I'm just saying be glad you're not worse off. 8/

Just in case you read this far, here's the aforementioned sketch (Monty Python version):

https://www.youtube.com/watch?v=ue7wM0QC5LE


Terry Bowman, KA4HJH
"The Mac Doctor"

https://www.astarcloseup.com

"In the land of the blind the one-eyed man is king"?Max Payne
"In regione caecorum rex est luscus"?Desiderius Erasmus

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From grant at musictechnologiesgroup.com  Mon May 11 23:46:30 2026
From: grant at musictechnologiesgroup.com (grant musictechnologiesgroup.com)
Date: Mon, 11 May 2026 21:46:30 +0000
Subject: [sdiy] How Bad Is Your Eyesight? (was Re: Burr Brown OPA2134PA)
In-Reply-To: <A1A899F5-8093-45FA-901E-33626C98C827@gmail.com>
References: <D1A4F41A-4916-4B06-8AE5-46C0A62783DE@icloud.com>
 <DBE689D9-278B-4954-B8C4-D3CE2F842773@aol.com>
 <CACodTR-mKt0e=AfLddcz4HW4Fcccbtu5gdnwrGbY0+ZG_QAc3Q@mail.gmail.com>
 <62343718-29ac-4af9-94b5-412ea8a83af1@chrismusic.de>
 <A1A899F5-8093-45FA-901E-33626C98C827@gmail.com>
Message-ID: <4180130b-9eb3-4d55-b37a-690124069d87@musictechnologiesgroup.com>

On 5/11/2026 2:26 PM, Terry Bowman via Synth-diy wrote:
> I'm not trying to win the "who's got it the worst" contest here,

"Yes you are."

https://www.youtube.com/watch?v=TpQlyUjp3vM



From brianw at audiobanshee.com  Tue May 12 00:06:48 2026
From: brianw at audiobanshee.com (brianw)
Date: Mon, 11 May 2026 15:06:48 -0700
Subject: [sdiy] Burr Brown OPA2134PA DIP
In-Reply-To: <CWLP265MB71326BF3DEA26F6731C19C03DB382@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
References: <D1A4F41A-4916-4B06-8AE5-46C0A62783DE@icloud.com>
 <DBE689D9-278B-4954-B8C4-D3CE2F842773@aol.com>
 <CACodTR-mKt0e=AfLddcz4HW4Fcccbtu5gdnwrGbY0+ZG_QAc3Q@mail.gmail.com>
 <8652a12b-44c7-46c2-a203-e1674154d046@comcast.net>
 <CWLP265MB71326BF3DEA26F6731C19C03DB382@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
Message-ID: <D118AAD1-6DAD-4E9A-BEA6-433EAD60D75B@audiobanshee.com>

Admittedly, I'm spoiled by living in big cities where assembly services (like JLCPCB) are a short drive from home.

I feel like I'm doing more than enough DIY by drawing up my own schematics and performing my own circuit board layout. I used to etch my own printed circuit boards until I got punched in the face by chlorine gas. Now, given that it's easy to create standard Gerber files for such things, I prefer to hire people to do the tasks like SMD soldering.

I have no interest in buying a second-hand Toast-R-Oven and spending time hacking that to create my own SMT oven. I'd rather let someone who has professional gear and daily experience do this for me. Then I have more time to spend on circuit design and component selection.

That said, I do have some basic rework tools, including Weller soldering tweezers, so I can swap components without a round trip to the assembly shop. I suppose that means placing one op-amp on a DIP adapter PCB would not be too much trouble.

Brian


On May 11, 2026, at 11:49 AM, Mike Bryant <mbryant at futurehorizons.com> wrote:
> 
> 	? I just use 3x reading glasses. Works well for me for 0805 at least.
> 
> I just use JLCPCB ?
> 
> From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of p. hendricks via Synth-diy <synth-diy at synth-diy.org>
> Sent: 11 May 2026 18:20
> To: synth-diy at synth-diy.org <synth-diy at synth-diy.org>
> Subject: Re: [sdiy] Burr Brown OPA2134PA DIP
>  
> On 5/9/26 6:29 AM, Pete Hartman via Synth-diy wrote:
> 
> 
> On Sat, May 9, 2026 at 7:00?AM rrsounds via Synth-diy <synth-diy at synth-diy.org> wrote:
> I don?t think anyone does SMD soldering without some form (or, my case, forms) of magnification.
> 
> Well maybe I'm the exception?  I have not found a comfortable and usable form of magnification for the soldering itself.  Doing 0805 and soic I generally haven't had any trouble without, despite being very nearsighted all my life.  I do have a headset magnifier and a desktop USB microscope but they're for inspection not soldering.
> 
> I just use 3x reading glasses. Works well for me for 0805 at least.



From dlmanley at sonic.net  Tue May 12 01:35:38 2026
From: dlmanley at sonic.net (Dave)
Date: Mon, 11 May 2026 16:35:38 -0700
Subject: [sdiy] Burr Brown OPA2134PA DIP
In-Reply-To: <D118AAD1-6DAD-4E9A-BEA6-433EAD60D75B@audiobanshee.com>
References: <D1A4F41A-4916-4B06-8AE5-46C0A62783DE@icloud.com>
 <DBE689D9-278B-4954-B8C4-D3CE2F842773@aol.com>
 <CACodTR-mKt0e=AfLddcz4HW4Fcccbtu5gdnwrGbY0+ZG_QAc3Q@mail.gmail.com>
 <8652a12b-44c7-46c2-a203-e1674154d046@comcast.net>
 <CWLP265MB71326BF3DEA26F6731C19C03DB382@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <D118AAD1-6DAD-4E9A-BEA6-433EAD60D75B@audiobanshee.com>
Message-ID: <F68A8F50-79E6-4796-8D57-D81D24E4CA0D@sonic.net>

To solder the soic to the adapter just take a fine tip soldering iron, and with  some fine gauge solder apply a dot on two opposite diagonal corner pads.  Place the soic above the pads and re-flow these two pads.   The soic is now held in place and properly aligned to all the pads.   Now one by one solder the other pads.   One good technique is to drag the iron across the leads while applying a tiny amount of solder to the tip.  With a little practice you can solder both sides of an soic in less than a minute.

If you get too much solder on some pads clean the iron tip and draw it across the pad.  This usually removes the excess solder without  using solder wick which will remove too much solder.

It's very easy and nothing to avoid.  No need for solder paste or an oven, or other special tools. 

-Dave

On May 11, 2026 3:06:48 PM PDT, brianw <brianw at audiobanshee.com> wrote:
>Admittedly, I'm spoiled by living in big cities where assembly services (like JLCPCB) are a short drive from home.
>
>I feel like I'm doing more than enough DIY by drawing up my own schematics and performing my own circuit board layout. I used to etch my own printed circuit boards until I got punched in the face by chlorine gas. Now, given that it's easy to create standard Gerber files for such things, I prefer to hire people to do the tasks like SMD soldering.
>
>I have no interest in buying a second-hand Toast-R-Oven and spending time hacking that to create my own SMT oven. I'd rather let someone who has professional gear and daily experience do this for me. Then I have more time to spend on circuit design and component selection.
>
>That said, I do have some basic rework tools, including Weller soldering tweezers, so I can swap components without a round trip to the assembly shop. I suppose that means placing one op-amp on a DIP adapter PCB would not be too much trouble.
>
>Brian
>
>
>On May 11, 2026, at 11:49 AM, Mike Bryant <mbryant at futurehorizons.com> wrote:
>> 
>> 	? I just use 3x reading glasses. Works well for me for 0805 at least.
>> 
>> I just use JLCPCB ?
>> 
>> From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of p. hendricks via Synth-diy <synth-diy at synth-diy.org>
>> Sent: 11 May 2026 18:20
>> To: synth-diy at synth-diy.org <synth-diy at synth-diy.org>
>> Subject: Re: [sdiy] Burr Brown OPA2134PA DIP
>>  
>> On 5/9/26 6:29 AM, Pete Hartman via Synth-diy wrote:
>> 
>> 
>> On Sat, May 9, 2026 at 7:00?AM rrsounds via Synth-diy <synth-diy at synth-diy.org> wrote:
>> I don?t think anyone does SMD soldering without some form (or, my case, forms) of magnification.
>> 
>> Well maybe I'm the exception?  I have not found a comfortable and usable form of magnification for the soldering itself.  Doing 0805 and soic I generally haven't had any trouble without, despite being very nearsighted all my life.  I do have a headset magnifier and a desktop USB microscope but they're for inspection not soldering.
>> 
>> I just use 3x reading glasses. Works well for me for 0805 at least.
>
>
>________________________________________________________
>This is the Synth-diy mailing list
>Submit email to: Synth-diy at synth-diy.org
>View archive at: https://synth-diy.org/pipermail/synth-diy/
>Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
>Selling or trading? Use marketplace at synth-diy.org
>
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From brothertheo2014 at gmail.com  Tue May 12 03:20:01 2026
From: brothertheo2014 at gmail.com (Brother Theo)
Date: Mon, 11 May 2026 21:20:01 -0400
Subject: [sdiy] How Bad Is Your Eyesight? (was Re: Burr Brown OPA2134PA)
In-Reply-To: <4180130b-9eb3-4d55-b37a-690124069d87@musictechnologiesgroup.com>
References: <D1A4F41A-4916-4B06-8AE5-46C0A62783DE@icloud.com>
 <DBE689D9-278B-4954-B8C4-D3CE2F842773@aol.com>
 <CACodTR-mKt0e=AfLddcz4HW4Fcccbtu5gdnwrGbY0+ZG_QAc3Q@mail.gmail.com>
 <62343718-29ac-4af9-94b5-412ea8a83af1@chrismusic.de>
 <A1A899F5-8093-45FA-901E-33626C98C827@gmail.com>
 <4180130b-9eb3-4d55-b37a-690124069d87@musictechnologiesgroup.com>
Message-ID: <CA+K2+D+-brMqhskntiRrqsR1S1g35Jc1-QEzE0fHgz0x5MBegw@mail.gmail.com>

I got you both beat for grumpiness.

--timster


On Mon, May 11, 2026 at 5:48?PM grant musictechnologiesgroup.com <
grant at musictechnologiesgroup.com> wrote:

> On 5/11/2026 2:26 PM, Terry Bowman via Synth-diy wrote:
> > I'm not trying to win the "who's got it the worst" contest here,
>
> "Yes you are."
>
> https://www.youtube.com/watch?v=TpQlyUjp3vM
>
>
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org
>


-- 
Timothy Ressel
909-423-5962
FutureRetro Synthesizers
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From markverbos at gmail.com  Tue May 12 12:13:31 2026
From: markverbos at gmail.com (mark verbos)
Date: Tue, 12 May 2026 12:13:31 +0200
Subject: [sdiy] New TI 5532
In-Reply-To: <CWLP265MB7132D9F042297BFE165A1D64DB3C2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
References: <8d3fe6d4-c8b3-1062-7291-6e2def7847ec@gmx.de>
 <18829422-E546-4E52-996E-6418A58CBBE3@me.com>
 <SJ2P222MB08546D7633EC7ABE361F67D7C43E2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
 <CC810EB5-EDF4-46A0-919D-63FEFBB66F5E@ericframpton.com>
 <CWLP265MB7132A98FC7B498852479E80EDB3F2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <1c3518d6-7167-45a9-8743-c2a13907f1f5@gmx.com>
 <KL1PR02MB6663238C9F42EEA218A36A80B33F2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <C609B059-C63C-42C3-96D4-5B3C2DD47234@scale.la>
 <695987411.4638817.1778112830525@mail.yahoo.com>
 <CA+K2+DLMpwX-rMWOvMSCmSyA352xGTrDCJV8N3iUSS7h67_0uQ@mail.gmail.com>
 <KL1PR02MB66637AD64CF51D362A2696A3B33C2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <CWLP265MB7132D9F042297BFE165A1D64DB3C2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
Message-ID: <187FEF19-DFF7-4F81-A585-3F134A4ED9CB@gmail.com>



> On May 7, 2026, at 18:27, Mike Bryant <mbryant at futurehorizons.com> wrote:
> 
> Would have been better if they'd just said use the OPA1678 which is moreorless drop-in for SMT versions.



max supply voltage of 36V. The mixing board channels with +/- 22V won?t like that.
maybe maybe not a problem for you.


Mark






> 
> There are several Chinese suppliers of real 5532 clones in DIP-8 if you need them.  The ones from COSINE are definitely drop in if you're worried.  Haven't tried the other suppliers.
> 
> 
> From: Synth-diy <synth-diy-bounces at synth-diy.org <mailto:synth-diy-bounces at synth-diy.org>> on behalf of Sean Ellis via Synth-diy <synth-diy at synth-diy.org <mailto:synth-diy at synth-diy.org>>
> Sent: 07 May 2026 14:36
> Cc: Synth-diy Mailing List <synth-diy at synth-diy.org <mailto:synth-diy at synth-diy.org>>
> Subject: [sdiy] New TI 5532
>  
> Just saw this thread, not sure if it was shared here. https://groupdiy.com/threads/the-new-ti-5532-chips-are-not-5532s-weve-used-for-decades.93707/
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org <mailto:marketplace at synth-diy.org>
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From mbryant at futurehorizons.com  Tue May 12 14:27:17 2026
From: mbryant at futurehorizons.com (Mike Bryant)
Date: Tue, 12 May 2026 12:27:17 +0000
Subject: [sdiy] New TI 5532
In-Reply-To: <187FEF19-DFF7-4F81-A585-3F134A4ED9CB@gmail.com>
References: <8d3fe6d4-c8b3-1062-7291-6e2def7847ec@gmx.de>
 <18829422-E546-4E52-996E-6418A58CBBE3@me.com>
 <SJ2P222MB08546D7633EC7ABE361F67D7C43E2@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>
 <CC810EB5-EDF4-46A0-919D-63FEFBB66F5E@ericframpton.com>
 <CWLP265MB7132A98FC7B498852479E80EDB3F2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <1c3518d6-7167-45a9-8743-c2a13907f1f5@gmx.com>
 <KL1PR02MB6663238C9F42EEA218A36A80B33F2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <C609B059-C63C-42C3-96D4-5B3C2DD47234@scale.la>
 <695987411.4638817.1778112830525@mail.yahoo.com>
 <CA+K2+DLMpwX-rMWOvMSCmSyA352xGTrDCJV8N3iUSS7h67_0uQ@mail.gmail.com>
 <KL1PR02MB66637AD64CF51D362A2696A3B33C2@KL1PR02MB6663.apcprd02.prod.outlook.com>
 <CWLP265MB7132D9F042297BFE165A1D64DB3C2@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>
 <187FEF19-DFF7-4F81-A585-3F134A4ED9CB@gmail.com>
Message-ID: <CWLP265MB7132C342ABF76690F310B511DB392@CWLP265MB7132.GBRP265.PROD.OUTLOOK.COM>


  *
max supply voltage of 36V. The mixing board channels with +/- 22V won?t like that.


Neither would a 5532 !  That is 36V max as well.

I was R&D director at a well known British mixer company and we always used +/-17V tops on the output stages.  Those using higher voltages for line drivers usually use a pair of output transistors to drive the line.  I think my predecessor Douglas Self shows how best to do this in his book.

________________________________
From: mark verbos <markverbos at gmail.com>
Sent: 12 May 2026 11:13
To: Mike Bryant <mbryant at futurehorizons.com>
Cc: Sean Ellis <tensiontype at hotmail.com>; Synth-diy Mailing List <synth-diy at synth-diy.org>
Subject: Re: [sdiy] New TI 5532



On May 7, 2026, at 18:27, Mike Bryant <mbryant at futurehorizons.com> wrote:

Would have been better if they'd just said use the OPA1678 which is moreorless drop-in for SMT versions.



max supply voltage of 36V. The mixing board channels with +/- 22V won?t like that.
maybe maybe not a problem for you.


Mark







There are several Chinese suppliers of real 5532 clones in DIP-8 if you need them.  The ones from COSINE are definitely drop in if you're worried.  Haven't tried the other suppliers.


________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org<mailto:synth-diy-bounces at synth-diy.org>> on behalf of Sean Ellis via Synth-diy <synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org>>
Sent: 07 May 2026 14:36
Cc: Synth-diy Mailing List <synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org>>
Subject: [sdiy] New TI 5532

Just saw this thread, not sure if it was shared here. https://groupdiy.com/threads/the-new-ti-5532-chips-are-not-5532s-weve-used-for-decades.93707/
________________________________________________________
This is the Synth-diy mailing list
Submit email to: Synth-diy at synth-diy.org<mailto:Synth-diy at synth-diy.org>
View archive at: https://synth-diy.org/pipermail/synth-diy/
Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
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From jpdesroc at oricom.ca  Fri May 15 15:29:10 2026
From: jpdesroc at oricom.ca (jpdesroc at oricom.ca)
Date: Fri, 15 May 2026 09:29:10 -0400
Subject: [sdiy] I'm thinking about making some ARP's VCF modules replicas
	for sale. But..
Message-ID: <000001dce46e$d0d55690$728003b0$@oricom.ca>

Hi list,

 

I'm thinking about making some ARP's VCF modules replicas for sale.

All the same components and PCB arrangements.

Completely the same as the originals..

But I'm wondering which one(s) would be the best candidate(s)

or should I say 'looked for'. So far the 4012 (Moog lader pursuit)

seems to be a good one, and the 4075 (Odyssey, Avatar)

could also be good ones.

I know this is a question of taste but

let me hear what are your thoughts.

 





 

 

 

 





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From elmacaco at hotmail.com  Fri May 15 16:30:04 2026
From: elmacaco at hotmail.com (el macaco)
Date: Fri, 15 May 2026 14:30:04 +0000
Subject: [sdiy] I'm thinking about making some ARP's VCF modules
	replicas	for sale. But..
In-Reply-To: <000001dce46e$d0d55690$728003b0$@oricom.ca>
References: <000001dce46e$d0d55690$728003b0$@oricom.ca>
Message-ID: <SJ2P222MB08546FC9238B011F2C6457BDC4042@SJ2P222MB0854.NAMP222.PROD.OUTLOOK.COM>

Hi,

I think there are new replacements available, I think an all 3 filters in one would be more popular, people with working arps could be customers.

The filters are repairable when they fail without requiring a new module, so I see limited need, would be cool for someone who wants to swap the filter in their arp or has a failed one and no tech or skills.

Ed

Get Outlook for iOS<https://aka.ms/o0ukef>
________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Jean-Pierre Desrochers via Synth-diy <synth-diy at synth-diy.org>
Sent: Friday, May 15, 2026 8:29:10 AM
To: synth-diy at synth-diy.org <synth-diy at synth-diy.org>
Subject: [sdiy] I'm thinking about making some ARP's VCF modules replicas for sale. But..


Hi list,



I?m thinking about making some ARP?s VCF modules replicas for sale.

All the same components and PCB arrangements.

Completely the same as the originals..

But I?m wondering which one(s) would be the best candidate(s)

or should I say ?looked for?. So far the 4012 (Moog lader pursuit)

seems to be a good one, and the 4075 (Odyssey, Avatar)

could also be good ones.

I know this is a question of taste but

let me hear what are your thoughts.



[cid:image005.jpg at 01DCE44D.4903C1F0]

[cid:image006.jpg at 01DCE44D.4903C1F0]









[cid:image007.jpg at 01DCE44D.4903C1F0]

[cid:image008.jpg at 01DCE44D.4903C1F0]
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From mec.forumreader at gmail.com  Fri May 15 16:48:13 2026
From: mec.forumreader at gmail.com (Michael E Caloroso)
Date: Fri, 15 May 2026 10:48:13 -0400
Subject: [sdiy] I'm thinking about making some ARP's VCF modules
 replicas for sale. But..
In-Reply-To: <000001dce46e$d0d55690$728003b0$@oricom.ca>
References: <000001dce46e$d0d55690$728003b0$@oricom.ca>
Message-ID: <CAAv6=UBSDf+_JR+LxJRgxE69ysAGP4jnKH284o7RAWru_30eVw@mail.gmail.com>

The 4035 is a good sounding ladder filter.  I have the 4034 in my
ProSoloist, same circuit except for different input impedance to match the
P/S.

https://vintagetechnologyarchive.com/synth/arp/4035-filter/

MC

On Fri, May 15, 2026 at 9:42?AM Jean-Pierre Desrochers via Synth-diy <
synth-diy at synth-diy.org> wrote:

> Hi list,
>
>
>
> I?m thinking about making some ARP?s VCF modules replicas for sale.
>
> All the same components and PCB arrangements.
>
> Completely the same as the originals..
>
> But I?m wondering which one(s) would be the best candidate(s)
>
> or should I say ?looked for?. So far the 4012 (Moog lader pursuit)
>
> seems to be a good one, and the 4075 (Odyssey, Avatar)
>
> could also be good ones.
>
> I know this is a question of taste but
>
> let me hear what are your thoughts.
>
>
>
>
>
>
>
>
>
>
>
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org
>
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From jpdesroc at oricom.ca  Fri May 15 17:27:57 2026
From: jpdesroc at oricom.ca (jpdesroc at oricom.ca)
Date: Fri, 15 May 2026 11:27:57 -0400
Subject: [sdiy] I'm thinking about making some ARP's VCF modules
 replicas for sale. But..
In-Reply-To: <CAAv6=UBSDf+_JR+LxJRgxE69ysAGP4jnKH284o7RAWru_30eVw@mail.gmail.com>
References: <000001dce46e$d0d55690$728003b0$@oricom.ca>
 <CAAv6=UBSDf+_JR+LxJRgxE69ysAGP4jnKH284o7RAWru_30eVw@mail.gmail.com>
Message-ID: <001201dce47f$68f7c4c0$3ae74e40$@oricom.ca>

The 4035 looks very similar to the 4012.. A Moog ladder ?

The most evident difference is the use of  3 x CA3086
instead of discrete transistors..

 

De : Michael E Caloroso <mec.forumreader at gmail.com> 
Envoy? : 15 mai 2026 10:48
? : jpdesroc at oricom.ca
Cc : synth-diy at synth-diy.org
Objet : Re: [sdiy] I'm thinking about making some ARP's VCF modules replicas for sale. But..

 

The 4035 is a good sounding ladder filter.  I have the 4034 in my ProSoloist, same circuit except for different input impedance to match the P/S.

 

https://vintagetechnologyarchive.com/synth/arp/4035-filter/

 

MC

 

On Fri, May 15, 2026 at 9:42?AM Jean-Pierre Desrochers via Synth-diy <synth-diy at synth-diy.org <mailto:synth-diy at synth-diy.org> > wrote:

Hi list,

 

I?m thinking about making some ARP?s VCF modules replicas for sale.

All the same components and PCB arrangements.

Completely the same as the originals..

But I?m wondering which one(s) would be the best candidate(s)

or should I say ?looked for?. So far the 4012 (Moog lader pursuit)

seems to be a good one, and the 4075 (Odyssey, Avatar)

could also be good ones.

I know this is a question of taste but

let me hear what are your thoughts.

 





 

 

 

 





________________________________________________________
This is the Synth-diy mailing list
Submit email to: Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org> 
View archive at: https://synth-diy.org/pipermail/synth-diy/
Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
Selling or trading? Use marketplace at synth-diy.org <mailto:marketplace at synth-diy.org> 

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From synthimuse at gmail.com  Fri May 15 17:34:22 2026
From: synthimuse at gmail.com (The SynthiMuse)
Date: Fri, 15 May 2026 16:34:22 +0100
Subject: [sdiy] I'm thinking about making some ARP's VCF modules
 replicas for sale. But..
In-Reply-To: <000001dce46e$d0d55690$728003b0$@oricom.ca>
References: <000001dce46e$d0d55690$728003b0$@oricom.ca>
Message-ID: <CAJ-kJoCdCA=jgv+0dQXsawrTLb45tKzyTE_=+1RHhKy7w-Mfzw@mail.gmail.com>

Hi JP

A few suggestions might be:

1. Design 3U & 5U modules to take the new submodules you design.
I see from your previous work that you have a MU system so it would be cool
to see Moog-style ARP modules.

2. Rather than aim for 100% clones, maybe implement the new filters as
close as possible in SMD and productionise them. This would be good
future-proofing but I accept the point that you may not wish to compromise
the ARP design integrity with changes.

3. Create the designs in KiCAD and open-source the design files.
I see CERN have open-sourced their component libraries so creation of the
design with KiCAD could be made easier by this:
https://hackaday.com/2026/05/12/another-gift-to-the-world-from-cern-their-entire-set-of-kicad-libraries/

Just a few thoughts

I look forward to hearing about your progress with this.

Best wishes

Gerry




On Fri, 15 May 2026, 14:41 Jean-Pierre Desrochers via Synth-diy, <
synth-diy at synth-diy.org> wrote:

> Hi list,
>
>
>
> I?m thinking about making some ARP?s VCF modules replicas for sale.
>
> All the same components and PCB arrangements.
>
> Completely the same as the originals..
>
> But I?m wondering which one(s) would be the best candidate(s)
>
> or should I say ?looked for?. So far the 4012 (Moog lader pursuit)
>
> seems to be a good one, and the 4075 (Odyssey, Avatar)
>
> could also be good ones.
>
> I know this is a question of taste but
>
> let me hear what are your thoughts.
>
>
>
>
>
>
>
>
>
>
>
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org
>
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From terje.winther at wintherstormer.no  Fri May 15 17:49:40 2026
From: terje.winther at wintherstormer.no (Terje Winther)
Date: Fri, 15 May 2026 17:49:40 +0200
Subject: [sdiy] I'm thinking about making some ARP's VCF modules
 replicas for sale. But..
In-Reply-To: <000001dce46e$d0d55690$728003b0$@oricom.ca>
References: <000001dce46e$d0d55690$728003b0$@oricom.ca>
Message-ID: <9D95A86A-45EB-4F37-92F9-25AAD8794BD4@wintherstormer.no>

Hi,
There are already modern variants for sale, like this one:
https://synthchaser.com/product/synthchaser-arp-4075-vcf-filter-submodule/ <https://synthchaser.com/product/synthchaser-arp-4075-vcf-filter-submodule/>

I remember that the site ARPtech back in the day offered a dual filter package with a switch. It was called the "40235 Dual Filter?. Sort of similar to what Korg-ARP is doing these days.



> 15. mai 2026 kl. 15:29 skrev Jean-Pierre Desrochers via Synth-diy <synth-diy at synth-diy.org>:
> 
> Hi list,
>  
> I?m thinking about making some ARP?s VCF modules replicas for sale.
> All the same components and PCB arrangements.
> Completely the same as the originals..
> But I?m wondering which one(s) would be the best candidate(s)
> or should I say ?looked for?. So far the 4012 (Moog lader pursuit)
> seems to be a good one, and the 4075 (Odyssey, Avatar)
> could also be good ones.
> I know this is a question of taste but
> let me hear what are your thoughts.
>  
> <image005.jpg>
> <image006.jpg>
>  
>  
>  
>  
> <image007.jpg>
> <image008.jpg>
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
> View archive at: https://synth-diy.org/pipermail/synth-diy/ <https://synth-diy.org/pipermail/synth-diy/>
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy <https://synth-diy.org/mailman/listinfo/synth-diy>
> Selling or trading? Use marketplace at synth-diy.org <mailto:marketplace at synth-diy.org>
Terje Winther
WintherStormer
terje.winther at wintherstormer.no




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From jpdesroc at oricom.ca  Fri May 15 17:55:25 2026
From: jpdesroc at oricom.ca (jpdesroc at oricom.ca)
Date: Fri, 15 May 2026 11:55:25 -0400
Subject: [sdiy] I'm thinking about making some ARP's VCF modules
 replicas for sale. But..
In-Reply-To: <9D95A86A-45EB-4F37-92F9-25AAD8794BD4@wintherstormer.no>
References: <000001dce46e$d0d55690$728003b0$@oricom.ca>
 <9D95A86A-45EB-4F37-92F9-25AAD8794BD4@wintherstormer.no>
Message-ID: <002401dce483$3f422360$bdc66a20$@oricom.ca>

Terje,

I knew Synthchaser had ARP VCF retrofits..

But selling ay $170USD.. Ooohh..

I?ll try to sell mine for a much lower on price..

And I chose to keep these things Through hole..

 

And thanks everyone for your comments.

I now have to think about my next move..

 

De : Terje Winther <terje.winther at wintherstormer.no> 
Envoy? : 15 mai 2026 11:50
? : jpdesroc at oricom.ca
Cc : synth-diy at synth-diy.org
Objet : Re: [sdiy] I'm thinking about making some ARP's VCF modules replicas for sale. But..

 

Hi,

There are already modern variants for sale, like this one:

https://synthchaser.com/product/synthchaser-arp-4075-vcf-filter-submodule/

 

I remember that the site ARPtech back in the day offered a dual filter package with a switch. It was called the "40235 Dual Filter?. Sort of similar to what Korg-ARP is doing these days.

 

 





15. mai 2026 kl. 15:29 skrev Jean-Pierre Desrochers via Synth-diy <synth-diy at synth-diy.org <mailto:synth-diy at synth-diy.org> >:

 

Hi list,

 

I?m thinking about making some ARP?s VCF modules replicas for sale.

All the same components and PCB arrangements.

Completely the same as the originals..

But I?m wondering which one(s) would be the best candidate(s)

or should I say ?looked for?. So far the 4012 (Moog lader pursuit)

seems to be a good one, and the 4075 (Odyssey, Avatar)

could also be good ones.

I know this is a question of taste but

let me hear what are your thoughts.

 

<image005.jpg>

<image006.jpg>

 

 

 

 

<image007.jpg>

<image008.jpg>

________________________________________________________
This is the Synth-diy mailing list
Submit email to:  <mailto:Synth-diy at synth-diy.org> Synth-diy at synth-diy.org
View archive at:  <https://synth-diy.org/pipermail/synth-diy/> https://synth-diy.org/pipermail/synth-diy/
Check your settings at:  <https://synth-diy.org/mailman/listinfo/synth-diy> https://synth-diy.org/mailman/listinfo/synth-diy
Selling or trading? Use  <mailto:marketplace at synth-diy.org> marketplace at synth-diy.org

 

Terje Winther

WintherStormer

terje.winther at wintherstormer.no <mailto:terje.winther at wintherstormer.no> 

 

 

 

 

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From list at mikebeauchamp.com  Fri May 15 20:51:39 2026
From: list at mikebeauchamp.com (Mike Beauchamp)
Date: Fri, 15 May 2026 14:51:39 -0400
Subject: [sdiy] I'm thinking about making some ARP's VCF modules
 replicas for sale. But..
In-Reply-To: <CAJ-kJoCdCA=jgv+0dQXsawrTLb45tKzyTE_=+1RHhKy7w-Mfzw@mail.gmail.com>
References: <000001dce46e$d0d55690$728003b0$@oricom.ca>
 <CAJ-kJoCdCA=jgv+0dQXsawrTLb45tKzyTE_=+1RHhKy7w-Mfzw@mail.gmail.com>
Message-ID: <6e046d48-b15f-420c-84a2-46e143526fe1@mikebeauchamp.com>



On 2026-05-15 11:34, The SynthiMuse via Synth-diy wrote:
> 2. Rather than aim for 100% clones, maybe implement the new filters as 
> close as possible in SMD and productionise them. This would be good 
> future-proofing but I accept the point that you may not wish to 
> compromise the ARP design integrity with changes.

Also if you went with SMD components, you could maybe fit all of them on 
a single PCB with some switches for selecting (dip switches maybe?).
And there's a decent amount of matched pair transistors already 
available in tiny packages.

Cool project!

Mike


From terje.winther at wintherstormer.no  Fri May 15 22:44:48 2026
From: terje.winther at wintherstormer.no (Terje Winther)
Date: Fri, 15 May 2026 22:44:48 +0200
Subject: [sdiy] I'm thinking about making some ARP's VCF modules
 replicas for sale. But..
In-Reply-To: <002401dce483$3f422360$bdc66a20$@oricom.ca>
References: <000001dce46e$d0d55690$728003b0$@oricom.ca>
 <9D95A86A-45EB-4F37-92F9-25AAD8794BD4@wintherstormer.no>
 <002401dce483$3f422360$bdc66a20$@oricom.ca>
Message-ID: <B2459B3B-47A3-4703-B900-AEE6D0D03F87@wintherstormer.no>

Yes,
They are expensive.

I actually came across an original unused (yes, unused) original ARP 4075 filter submodules. It was faulty, but I found the fault: a production error (a short) on the PCB. Fairly easy corrected. So this submodules was probably selected out during the production phase. What to do with it? Well, inspired by the Tangerine Dream Project Electronics modular, I of course made a 5U modules with it, and it works like a charm. Veroboard for the external components, as described in the schematics, and drilled holes for the submodules. Scaffer front panel to suit. So the idea of having 5U and 3U modules that can easily fit submodules is a thought.

Terje Winther
WintherStormer



> 15. mai 2026 kl. 17:55 skrev <jpdesroc at oricom.ca> <jpdesroc at oricom.ca>:
> 
> Terje,
> I knew Synthchaser had ARP VCF retrofits..
> But selling ay $170USD.. Ooohh..
> I?ll try to sell mine for a much lower on price..
> And I chose to keep these things Through hole..
>  
> And thanks everyone for your comments.
> I now have to think about my next move..
>  
> De : Terje Winther <terje.winther at wintherstormer.no> 
> Envoy? : 15 mai 2026 11:50
> ? : jpdesroc at oricom.ca
> Cc : synth-diy at synth-diy.org
> Objet : Re: [sdiy] I'm thinking about making some ARP's VCF modules replicas for sale. But..
>  
> Hi,
> There are already modern variants for sale, like this one:
> https://synthchaser.com/product/synthchaser-arp-4075-vcf-filter-submodule/ <https://synthchaser.com/product/synthchaser-arp-4075-vcf-filter-submodule/>
>  
> I remember that the site ARPtech back in the day offered a dual filter package with a switch. It was called the "40235 Dual Filter?. Sort of similar to what Korg-ARP is doing these days.
>  
>  
> 
> 
>> 15. mai 2026 kl. 15:29 skrev Jean-Pierre Desrochers via Synth-diy <synth-diy at synth-diy.org <mailto:synth-diy at synth-diy.org>>:
>>  
>> Hi list,
>>  
>> I?m thinking about making some ARP?s VCF modules replicas for sale.
>> All the same components and PCB arrangements.
>> Completely the same as the originals..
>> But I?m wondering which one(s) would be the best candidate(s)
>> or should I say ?looked for?. So far the 4012 (Moog lader pursuit)
>> seems to be a good one, and the 4075 (Odyssey, Avatar)
>> could also be good ones.
>> I know this is a question of taste but
>> let me hear what are your thoughts.
>>  
>> <image005.jpg>
>> <image006.jpg>
>>  
>>  
>>  
>>  
>> <image007.jpg>
>> <image008.jpg>
>> ________________________________________________________
>> This is the Synth-diy mailing list
>> Submit email to: Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
>> View archive at: https://synth-diy.org/pipermail/synth-diy/ <https://synth-diy.org/pipermail/synth-diy/>
>> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy <https://synth-diy.org/mailman/listinfo/synth-diy>
>> Selling or trading? Use marketplace at synth-diy.org <mailto:marketplace at synth-diy.org>
>  
> Terje Winther
> WintherStormer
> terje.winther at wintherstormer.no <mailto:terje.winther at wintherstormer.no>
Terje Winther
WintherStormer
terje.winther at wintherstormer.no




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