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

Roman Sowa modular at go2.pl
Thu Apr 6 09:31:25 CEST 2023

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:
And when you add 2nd transistor in reverse, that VCA becomes clean as 
baby butt wipes


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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