[sdiy] Simple VCA schematic, anyone?

[René Schmitz]

Hi again,

René Schmitz wrote:
> You have to run the emitter into a virtual GND of an opamp, possibly via 
> a DC blocking cap. Btw, this circuit has been used almost ubiquitously 
> in the Rolands and Korgs analog Drummachines.

Well, in some. TR909 at least. :-P

Expect severe asymmetric distortion, and quite some CV feedthrough 
(hence the lowpass at the base, to take the bite out of the click). Also 
one needs to attenuate the input signal down to some 50-100mVpp.

Cheers,
  René



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uzs159 at uni-bonn.de
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