AW: [sdiy] ota's as gates.

[Nils Pipenbrinck]

René wrote:
> I'd suggest to try a grounded base circuit for driving the Iabc. With
> that you can "lift" the current sinking node to any desired potential.
> Just use a PNP transistor, put the R that supplies the Iabc to the
> emitter, put the base to your desired reference voltage (the voltage you
> drive the current against) and tie the collector to the Iabc pin. (Have
> a look at the VCA2 at my homepage, that should give you an idea how this
> looks like.)

I took a look at it.. Looks like a good solution for me. I don't mind the
extra tranny.

Btw, I'm somewhat shocked by the simplicity of your VCA2. How good does it
perform?

  Nils