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Cgs synth

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Re: Synthacon filters are up and running

2004-05-10 by Ryan Williams

Richard Brewster wrote:
> I finally got the dual Synthacon module all put together this weekend.
> It is a unique filter. The band pass, especially. If you don't build
> two, then you won't realize how, even with all the parts nominally the
> same, two Synthacon filters will have different characteristics. It
> must be differences in the gain of the transistors. I notice different
> VC gain and different resonance pot response between the two.

hi, I've been analyzing the circuit a bit today. I think you are right.
If my calculations are correct the the beta of the transistors will
affect the resonance level at a particular pot setting.

>
> I made a patch using the two Synthacons and also my two new CGS VCOs.
> I've uploaded an MP3 to the files section on Yahoo.

sounds cool!

,ryan

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