[sdiy] CV-vactrol circuit

niroke at tampabay.rr.com niroke at tampabay.rr.com
Fri Jul 3 23:41:05 CEST 2015

No, I hadn't heard of those before.  I'll look them up, but right now I don't know how I would apply the transistor to a VR.  Still have lots to learn

---- Scott Gravenhorst <music.maker at gte.net> wrote: 
> <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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