[sdiy] what opamp for "warmth"? (I know, I know...)

Todd Sines sines_list at scale.la
Thu Apr 6 18:26:24 CEST 2023


Mike Schmidt of EAS made a series of DIY PCBs (complete with a “bonus” VCF) for most of the MS10, would anticipate the VCA would be similar.
https://synthcube.com/cart/eas-miss10-vcf-vca
https://synthcube.com/cart/eas-en/eas-miss10-vco
https://synthcube.com/cart/eas-en/eas-miss-10-lfo-sh-noise


Todd


> On Apr 6, 2023, at 12:15 PM, Jason Proctor <jason at redfish.net> wrote:
> 
> Is the MS20 VCA available in Euro, perchance?
> 
> On Thu, 6 Apr 2023 at 00:35, Roman Sowa <modular at go2.pl> wrote:
>> 
>> That's a single transistor VCA and indeed it sounds amazing, although a
>> bit noisy as there is a lot of gain involved. I used it in my simple VCO
>> and it makes fat sound out of otherwise boring clean oscillator.
>> Here's a short video showing waveshapes on a scope. The input to VCA was
>> variable trapezoid to add even more fattness:
>> https://youtu.be/algsxOo6lns
>> And when you add 2nd transistor in reverse, that VCA becomes clean as
>> baby butt wipes
>> 
>> Roman
>> 
>> W dniu 2023-04-05 o 20:32, David G Dixon via Synth-diy pisze:
>>> Whatever the VCA is in the Korg MS-20 really warms up the sound of that
>>> synthesizer.  You can find the schematic on the internet.  I have
>>> something redrawn by a fellow named Marjan Urekar that I looked at years
>>> ago.  It involves two transistors.  It is evidently also the VCA used in
>>> the Roland JX-3P.
>>> 
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