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

Jason Proctor jason at redfish.net
Thu Apr 6 18:15:35 CEST 2023


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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