[sdiy] Quad VCA design

Dave Manley dlmanley at sonic.net
Wed May 15 21:10:17 CEST 2013 

Thanks for the info.  Another list member mentioned google and "ron dow ssm" does turn up some interesting articles.  Always cool to read about the pioneers of integrated analog synthesizers.

-------- Original Message --------
 From: Terry Shultz <thx1138 at earthlink.net>
 Sent: Wed, May 15, 2013 11:16 AM
 To: Dave Manley <dlmanley at sonic.net>
 CC: synth-diy <synth-diy at dropmix.xs4all.nl>
 Subject: Re: [sdiy] Quad VCA design

>Hi Dave,
>
>Ron Dow designed a good deal of the early SSM devices when I worked at e-mu back in the late 1970's to 1984.  PMI bought out ssmt and adi bought out pmi. Precision monolithics inc.
>
>Ron, Dan parks , Dave rossum and I were all working on emulator, audity, drumulator and the last of the modular e-mu products.
>
>Best regards,
>
>Terry
>
>Sent from my iPad
>
>On May 15, 2013, at 11:03 AM, Dave Manley <dlmanley at sonic.net> wrote:
>
>> Terry, who is Ron Dow?  I've not run across his name before.
>> 
>> -------- Original Message --------
>> From: Terry Shultz <thx1138 at earthlink.net>
>> Sent: Wed, May 15, 2013 10:50 AM
>> To: cheater00 . <cheater00 at gmail.com>
>> CC: synth-diy <synth-diy at dropmix.xs4all.nl>
>> Subject: Re: [sdiy] Quad VCA design
>> 
>>> Well, I try to entertain a little.
>>> 
>>> Normally, I try not to impress with extensive knowledge. I can learn a lot of new tricks if I listen and don't talk at the same time.
>>> 
>>> Unfortunately, I have spent too much time in designing chips, and have been passed by newer audio solutions.
>>> 
>>> Remember, it has been since 1985, since I have done any new synth modules. 
>>> 
>>> Since then, old friends like Doug Curtis and Ron Dow have passed away and so has many of the products.
>>> 
>>> Evan Brooks, cofounder of Digidesign contacted me back in March and suggested I re-enter the analog designs again. He feels this market might still have some sales going forward.
>>> 
>>> We'll see.
>>> Regards,
>>> 
>>> Terry
>>> 
>>> 
>>> Sent from my iPad
>>> 
>>> On May 15, 2013, at 10:35 AM, "cheater00 ." <cheater00 at gmail.com> wrote:
>>> 
>>>> Self-destruction! And I thought this thread was going to end up boring ;-)
>>>> 
>>>> On Wed, May 15, 2013 at 6:30 PM, David G Dixon <dixon at mail.ubc.ca> wrote:
>>>>> I have used V2164 in virtually every module I've designed in the last three
>>>>> years, and it's brilliant.  It has its quirks (you will get very familiar
>>>>> with the fine print of the datasheet, especially if you try to do
>>>>> unconventional stuff with it), but it is a solid performer.  Just don't try
>>>>> to power it up backwards.  Unlike most opamps, it will self-destruct
>>>>> instantly (as would the SSM2164).
>>>>> 
>>>>> 
>>>>>> http://www.smallbearelec.com/servlet/Detail?no=737 - $3.50
>>>>>> singles // comes down quickly from there in multiples..
>>>>>> 
>>>>>> On 15/05/2013 16:11, Terry Shultz wrote:
>>>>>>> Hi Damian,
>>>>>>> 
>>>>>>> Any cost idea on small volume usage?
>>>>>>> 
>>>>>>> Regards,
>>>>>>> 
>>>>>>> Terry
>>>>>>> 
>>>>>>> Sent from my iPad
>>>>>>> 
>>>>>>> On May 15, 2013, at 7:15 AM, "cheater00 ."
>>>>>> <cheater00 at gmail.com> wrote:
>>>>>>> 
>>>>>>>> Hi Terry,
>>>>>>>> people here really like the CoolAudio chips. The V2164 has
>>>>>> met with
>>>>>>>> great reception on the list and is a very good equivalent
>>>>>> to the SSM
>>>>>>>> 2164.
>>>>>>>> 
>>>>>>>> Cheers,
>>>>>>>> Damian
>>>>>>>> 
>>>>>>>> On Wed, May 15, 2013 at 2:39 PM, Nathanael King
>>>>>>>> <nate at paperproductsmusic.com> wrote:
>>>>>>>>> Not only does THAT have the 2180 line, but they also have
>>>>>> an ssm2164
>>>>>>>>> available in 2 vcas (2162) in a surface mount package.
>>>>>> http://www.thatcorp.com/2162_Dual_Pre-Trimmed_Blackmer_IC_Voltage-Co
>>>>>>>>> ntrolled_Amplifier.shtml
>>>>>>>>> 
>>>>>>>>> Nate
>>>>>>>>> 
>>>>>>>>> On Wed, May 15, 2013 at 8:33 AM, Terry Shultz
>>>>>> <thx1138 at earthlink.net> wrote:
>>>>>>>>>> Hi All,
>>>>>>>>>> 
>>>>>>>>>> I have finally used the last of my SSM2020 devices on my
>>>>>> boards and
>>>>>>>>>> it is time to re-design the Quad VCA and Universal
>>>>>> Active filter modules.
>>>>>>>>>> 
>>>>>>>>>> I was looking at the LM13600/LM13700 and THAT Corp. VCA devices.
>>>>>>>>>> 
>>>>>>>>>> Any thoughts on those devices vs. other methods of
>>>>>> building a Solid
>>>>>>>>>> VCA design?
>>>>>>>>>> 
>>>>>>>>>> I have not had to re-build these modules for over 25 years, so I
>>>>>>>>>> get to explore a whole new analog approach again.
>>>>>>>>>> 
>>>>>>>>>> 
>>>>>>>>>> I will not use the Grey Market SSM's if I can help it, but
>>>>>>>>>> Rochester Electronics seem to have SSMSSM 2014/ SSM2018,
>>>>>> SSM2122 devices.
>>>>>>>>>> 
>>>>>>>>>> Any thoughts?
>>>>>>>>>> 
>>>>>>>>>> 
>>>>>>>>>> Terry Shultz
>>>>>>>>>> thx1138 at earthlink.net
>>>>>>>>>> 
>>>>>>>>>> 
>>>>>>>>>> 
>>>>>>>>>> _______________________________________________
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>>>>>>>>>> Synth-diy at dropmix.xs4all.nl
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>>>>>>>>> 
>>>>>>>>> 
>>>>>>>>> 
>>>>>>>>> --
>>>>>>>>> Nate King
>>>>>>>>> Paper Products Music
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>>>>>> 
>>>>>> --
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>>>>>> VAT No. GB 988 2629 57
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