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<p>Some years ago, I had an idea of using 9 pin DB9 data connectors
as patch cords for a polyphonic all-analog modular synth.
Technically, you could patch up 8 voices + common ground.</p>
<p>- Oren (another Oren!)<br>
</p>
<div class="moz-cite-prefix">On 12/26/18 1:29 PM, oren levy wrote:<br>
</div>
<blockquote type="cite"
cite="mid:AC91E158-BBE4-4172-9BBD-70A2720CAF33@gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr"><span></span></div>
<div dir="ltr">Sorry about my earlier recommendations; didn’t
realize you wanted all analog.
<div><br>
</div>
<div>As far as switches go, I really like the Intersil (now
Renesas) BiCMOS 16x8 crosspoint switch IC. Low ron and very
very low crosstalk. I used it when designing the Music Man
‘Game Changer’ guitars for pickup switching, but, it maxes out
at 15V.</div>
<div><a
href="https://www.renesas.com/us/en/products/audio-video/video-switching/unbuffered-crosspoint-switches/device/CD22M3494.html"
moz-do-not-send="true">https://www.renesas.com/us/en/products/audio-video/video-switching/unbuffered-crosspoint-switches/device/CD22M3494.html</a><br>
<br>
<div id="AppleMailSignature" dir="ltr">Rock & Roll,
<div>Oren Levy</div>
</div>
<div dir="ltr"><br>
On Dec 26, 2018, at 09:09, cheater00 cheater00 <<a
href="mailto:cheater00@gmail.com" moz-do-not-send="true">cheater00@gmail.com</a>>
wrote:<br>
<br>
</div>
<blockquote type="cite">
<div dir="ltr"><span>analog switch ICs are terrible, let's
just skip them. You're not</span><br>
<span>making an analog switch ic based system anywhere
near close a medium</span><br>
<span>sized modular, it's insanity and prone to shitloads
of interference.</span><br>
<span>same with mod busses. the switch ICs are very
proprietary. I haven't</span><br>
<span>found a digital multiplexer IC that was good, has
anyone got any good</span><br>
<span>suggestions?</span><br>
<span></span><br>
<span>On Wed, Dec 26, 2018 at 5:16 PM Tom Wiltshire <<a
href="mailto:tom@electricdruid.net"
moz-do-not-send="true">tom@electricdruid.net</a>>
wrote:</span><br>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>Why not make a number of
“analog virtual patch cables” with analog switch ICs?
Each cable has a switch at both ends, one selects
between X sources, and the other selects between Y
destinations. This is conceptually very similar to a
genuine modular with hardware cables, but the control
signals can be fanned out to however many voices you
have.</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>Alternatively, you could
have a “mod buss” type system, where each module
output could be sent to a particular destination buss,
and each module input could be switch to tap signal
from a given buss. Again, control signals for the
switches in such a set-up can be fanned out to however
many voices are required.</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>For any polyphonic system
(except the early oberheims?), the control panel is
separated from the voice generation, so you can think
about the interface separately from the
audio-producing part of the circuit.</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>Tom</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>==================</span><br>
</blockquote>
<blockquote type="cite"><span> Electric Druid</span><br>
</blockquote>
<blockquote type="cite"><span>Synth & Stompbox DIY</span><br>
</blockquote>
<blockquote type="cite"><span>==================</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span>On 25 Dec 2018, at 22:40,
cheater00 cheater00 <<a
href="mailto:cheater00@gmail.com"
moz-do-not-send="true">cheater00@gmail.com</a>>
wrote:</span><br>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span></span><br>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span>I want to make this work
for an all-analog synthesizer, but rather</span><br>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span>than use crosspoint
switches I want to use patch cables which makes</span><br>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span>things much less
annoyingly complex and expensive. The thing is,
where</span><br>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span>on a monosynth you have a
single patch cable, on a patchable polysynth</span><br>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span>you have n patch cables,
one for each voice. So I am currently trying</span><br>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span>to work out how to do this
using a single patch cable, and frequency</span><br>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span>domain multiplexing came
to mind. I'm 100% certain an FPGA cannot do</span><br>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span>FDM, since almost all of
this is analog, so I'm looking at dedicated</span><br>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span>radio transmitter chips.
At $4 per chip, it's not so bad. The question</span><br>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span>is how to make the chips
talk to a single medium without fighting each</span><br>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span>other.</span><br>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span></span><br>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span>On Tue, Dec 25, 2018 at
11:24 PM Ben Bradley <<a
href="mailto:ben.pi.bradley@gmail.com"
moz-do-not-send="true">ben.pi.bradley@gmail.com</a>>
wrote:</span><br>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span></span><br>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>What you're describing
sounds all-digital.</span><br>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span></span><br>
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<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>It seems to me a
crosspoint switch would be the thing to have on
each</span><br>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>(analog) voice, and have
them controlled by the usual microcontroller</span><br>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>for a polyphonic
analog-signal-path synthesizer. Of course, this is
a</span><br>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>woefully incomplete
description.</span><br>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span></span><br>
</blockquote>
</blockquote>
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<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>On Tue, Dec 25, 2018 at
4:58 PM oren levy <<a
href="mailto:orenlevysticky@gmail.com"
moz-do-not-send="true">orenlevysticky@gmail.com</a>>
wrote:</span><br>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span></span><br>
</blockquote>
</blockquote>
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</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>You can use the FPGA
to combine all the data you are trying to
transmit into a single stream that you can
transmit over a single cable.</span><br>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>MADI interfaces are
expensive as a unit. There are various ways to
implement MADI at a board level with
microcontrollers and FPGAs.</span><br>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>Other options would be
to make your own protocol. Using a TRRS cable
should be able to provide enough bandwidth at
more manageable speeds that won’t require you to
think about transmission line theory.</span><br>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
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<blockquote type="cite">
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<blockquote type="cite"><span></span><br>
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</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>Rock & Roll,</span><br>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>Oren Levy</span><br>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span></span><br>
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<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>On Dec 25, 2018, at
11:13, cheater00 cheater00 <<a
href="mailto:cheater00@gmail.com"
moz-do-not-send="true">cheater00@gmail.com</a>>
wrote:</span><br>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span></span><br>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>The objective is to
be able to create a way for a single patch
cord to</span><br>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>carry 16 voices. I'm
not sure how an FPGA in itself will help me,
have</span><br>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>you got any ideas?</span><br>
</blockquote>
</blockquote>
</blockquote>
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<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span></span><br>
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</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>MADI interfaces are
prohibitively expensive.</span><br>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span></span><br>
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<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>On Tue, Dec 25,
2018 at 9:19 PM oren levy <<a
href="mailto:orenlevysticky@gmail.com"
moz-do-not-send="true">orenlevysticky@gmail.com</a>>
wrote:</span><br>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span></span><br>
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</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>I think you’d be
better off using FPGAs so you can mux the
signals however you want along with data.
Either a bunch of small ones or one big one
per module.</span><br>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>If you just want
to share audio and don’t want to mess around
with FPGAs, you can probably use a protocol
like MADI. Not sure if MADI has a DC
coupling requirement but if not, CV could
also be passed.</span><br>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>You’d probably
want a very stable clock to sync all the
modules to and optimize clock phase delays
so everything can mux/demux in sync.</span><br>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
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<blockquote type="cite">
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<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>Rock & Roll,</span><br>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>Oren Levy</span><br>
</blockquote>
</blockquote>
</blockquote>
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<blockquote type="cite">
<blockquote type="cite">
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<blockquote type="cite"><span></span><br>
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<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>On Dec 25, 2018,
at 10:01, Mike Beauchamp <<a
href="mailto:list@mikebeauchamp.com"
moz-do-not-send="true">list@mikebeauchamp.com</a>>
wrote:</span><br>
</blockquote>
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<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>transmission.
In a 16 voice system, at about 5 output
functions per</span><br>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>module, and 12
modules, you can easily use up ~1000 of
those, which</span><br>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
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<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>drops the
price to $4. I was wondering what
everyone thinks about this</span><br>
</blockquote>
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<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>sort of
scheme.</span><br>
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<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>So there's $4000
worth of just one IC in a single complete
polysynth?</span><br>
</blockquote>
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<blockquote type="cite"><span>_______________________________________________</span><br>
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<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>Synth-diy
mailing list</span><br>
</blockquote>
</blockquote>
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<blockquote type="cite">
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<blockquote type="cite"><span><a
href="mailto:Synth-diy@synth-diy.org"
moz-do-not-send="true">Synth-diy@synth-diy.org</a></span><br>
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<blockquote type="cite"><span><a
href="http://synth-diy.org/mailman/listinfo/synth-diy"
moz-do-not-send="true">http://synth-diy.org/mailman/listinfo/synth-diy</a></span><br>
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<blockquote type="cite"><span>_______________________________________________</span><br>
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<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>Synth-diy mailing
list</span><br>
</blockquote>
</blockquote>
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</blockquote>
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<blockquote type="cite">
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<blockquote type="cite"><span><a
href="mailto:Synth-diy@synth-diy.org"
moz-do-not-send="true">Synth-diy@synth-diy.org</a></span><br>
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<blockquote type="cite"><span><a
href="http://synth-diy.org/mailman/listinfo/synth-diy"
moz-do-not-send="true">http://synth-diy.org/mailman/listinfo/synth-diy</a></span><br>
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<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span></span><br>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>_______________________________________________</span><br>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>Synth-diy mailing list</span><br>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span><a
href="mailto:Synth-diy@synth-diy.org"
moz-do-not-send="true">Synth-diy@synth-diy.org</a></span><br>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span><a
href="http://synth-diy.org/mailman/listinfo/synth-diy"
moz-do-not-send="true">http://synth-diy.org/mailman/listinfo/synth-diy</a></span><br>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span></span><br>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>_______________________________________________</span><br>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span>Synth-diy mailing list</span><br>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span><a
href="mailto:Synth-diy@synth-diy.org"
moz-do-not-send="true">Synth-diy@synth-diy.org</a></span><br>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite"><span><a
href="http://synth-diy.org/mailman/listinfo/synth-diy"
moz-do-not-send="true">http://synth-diy.org/mailman/listinfo/synth-diy</a></span><br>
</blockquote>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span></span><br>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span>_______________________________________________</span><br>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span>Synth-diy mailing list</span><br>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span><a
href="mailto:Synth-diy@synth-diy.org"
moz-do-not-send="true">Synth-diy@synth-diy.org</a></span><br>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span><a
href="http://synth-diy.org/mailman/listinfo/synth-diy"
moz-do-not-send="true">http://synth-diy.org/mailman/listinfo/synth-diy</a></span><br>
</blockquote>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<span></span><br>
<span>_______________________________________________</span><br>
<span>Synth-diy mailing list</span><br>
<span><a href="mailto:Synth-diy@synth-diy.org"
moz-do-not-send="true">Synth-diy@synth-diy.org</a></span><br>
<span><a
href="http://synth-diy.org/mailman/listinfo/synth-diy"
moz-do-not-send="true">http://synth-diy.org/mailman/listinfo/synth-diy</a></span><br>
</div>
</blockquote>
</div>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
Synth-diy mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Synth-diy@synth-diy.org">Synth-diy@synth-diy.org</a>
<a class="moz-txt-link-freetext" href="http://synth-diy.org/mailman/listinfo/synth-diy">http://synth-diy.org/mailman/listinfo/synth-diy</a>
</pre>
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