[sdiy] Synthancon VC-Resonance

[John Luciani]

On 5/2/06, Aaron Lanterman <lanterma at ece.gatech.edu> wrote:

> What worries me though is that the resistor it looks like they want to
> replace is a floating resistor. The circuit there looks like like it
> insists that one point of the "variable resistor" be tied to ground, but
> in Ken's Synthacon, the 1k/1kpot setup is tied from emitter of the 2n2222
> back to the BP input through a 1k resistor.

That circuit may not work for a floating resistor. Replacing a
floating resistor with a circuit that won't be floating (due to the
control voltage) could be tricky.

When I took a quick look at the filter schematic I missed the pot connected
to the 2N2222. Since the only pot I saw was the frequency pot I suggested the
current sink. Of course if I read the original email properly I would have seen
*voltage controller resonance* :-)

(* jcl *)

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