[sdiy] Best VCA circuit for synth module..

blacet at blacet.com blacet at blacet.com
Thu Oct 4 20:48:58 CEST 2012

SSM2164 is a more modern component with a bit better performance. It's
expo but you can linearize it with one section in the feedback loop ala
Mike Irwin's article in EDN.

I think temperature compensation is usually left out of most designs as
the drift is not detectable when you are talking about volume. Most
transconductance ICs have the 3500ppm drift.

> What would be the best VCA core design already available
> on the net ?
> I need log/lin choice feature on control voltages.
> Temperature stable, low noise, high headroom..
> LM13600, LM13700, CA3080..??
> The summing control voltages part is no problem.
> The important part is the VCA core itself.
> The best design I found so far seems to be this one:
> http://hem.bredband.net/bersyn/VCA/lm13600%20vca%202.htm
> but I don't know if it's LIN or LOG and
> I'd rather have both possibility on the same board.
> Any suggestions ?
> Thanks
> J-Pierre
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