[sdiy] CV-vactrol circuit
music.maker at gte.net
Fri Jul 3 23:09:01 CEST 2015
<niroke at tampabay.rr.com> wrote:
>I'm trying to add external control to my TR-9090's voice
>parameters, and I'm sure if that was as simple as patching in to
>a CV summing point, it would have been done by now. The 909
>circuits don't lend themselves to voltage control. From what I
>know, I can control the parameters with a vactrol in series with
>the variable resistor. If you have a better solution, I'm eager
>to hear it!
Have you looked at H11F1? They might be a lot more cosistent from unit
to unit and it's basically the same thing as a vactrol, just that it's
an LED that shines onto a MOSFET transistor. They will handle AC signals.
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