MOTM

It takes 1 of 2 approaches to replace a pot with a cv, based on the
situation.

1. replacing a pot that just provides a control voltage in the first place -
no problem, you just tap into the summing amp with an input.

2. replacing an arbitrary pot that carries signal, for example the resonance
pot on a filter - you have to replace the pot with a simple VCA, so it's
nontrivial.

Dave Bradley
Principal Software Engineer
Engineering Animation, Inc.
daveb@...

> -----Original Message-----
> From: David Bivins [mailto:dbivins@...]
> Sent: Tuesday, April 18, 2000 12:36 PM
> To: motm@egroups.com
> Subject: RE: [motm] silly question
>
>
> I see your point, but--
>
> Don't you already have voltage control over frequency on your 420s?! You
> should have three inputs that will control the cutoff frequency
> via voltage,
> labeled: 1V/OCT, FM1, and FM2. What you *don't* have is voltage
> control over
> resonance amount. You do get that (as well as cutoff control) on the 440.
>
> I don't know the technical answer to your question, but having
> asked similar
> questions on AH awhile back and getting learned responses from
> the likes of
> Kevin Lightner and probably Paul too, the answer is no. With some circuits
> it might be a simple matter, with others, not a simple matter. So there
> would be no "generic" approach that would work.
>
> David.
>
> > -----Original Message-----
> > From: Nathan Alan Hunsicker [mailto:nate@...]
> > Sent: Monday, April 17, 2000 8:29 PM
> > To: MOTM Newsgroup
> > Subject: [motm] silly question
> >
> >
> > Is there any simple circuit that could be made to permit voltage control
> > over any pot? My question probably doesn't make much sense, and with my
> > limited electrical knowledge, I probably won't explain it very well
> > either. What I was thinking of was  a circuit designed to simulate a
> > pot. A simple circuit with a CV in, a CV attenuator, and 3 wires to
> > replace the pot, 2 to provide a constant resistance and one to vary
> > according to CV. This would be a simple solution to those of us who want
> > voltage control over the freq. on their MOTM-420's or the wet/dry
> > control on a spring reverb. Maybe I'm out of my mind here, and this is
> > an impossibility, but it's worth throwing out. Let me know if it's
> > possible or if it would involve too much circuitry. -Nate
> >
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