Actually, the circuit is here:
http://www.synthfool.com/schematics/polyef.jpgDave Bradley
Principal Software Engineer
Engineering Animation, Inc.
daveb@... > -----Original Message-----
> From: Paul Schreiber [mailto:synth1@...]
> Sent: Wednesday, March 08, 2000 11:23 PM
> To: motm@onelist.com
> Subject: Re: [motm] frustrated beyond belief
>
>
> From: "Paul Schreiber" <synth1@...>
>
> You can't, in general, run audio into the GATE. What you need is something
> external
> to generate a GATE. There are 2 ways to do this:
>
> a) use a keyboard or MIDI-CV with GATE out. It doesn't matter
> which key you
> press :)
>
> b) use a circuit called an Envelope Follower/Gate Extractor. The EF is a
> rectifier followed by a
> low-pass filter. This generates a DC level based on the input amplitude.
> Then, a comparator is set
> to be HIGH (ie at +5V) if this level exceeds a certain trip point
> (usually a
> panel knob).
>
> There will be a MOTM module that does this in about 8 weeks. There are
> schematics at
>
> www.synthfool.com/diy
>
> for this as well. I think the old Polyfusion EF is there.
>
> What's wrong with the '120??!
>
> Paul S.
>
> ----- Original Message -----
> From: mark scetta <n0nspaz@...>
> To: <motm@onelist.com>
> Sent: Wednesday, March 08, 2000 11:11 PM
> Subject: [motm] frustrated beyond belief
>
>
> > From: mark scetta <n0nspaz@...>
> >
> > i am having the hardest time doing something that i think should be very
> > simple: applying an ADSR to the volume of an audio signal. somebody,
> > please, where am i going wrong:
> >
> > audio in is going to a preamp then into a mult block in my patchbay then
> > to the 110VCA and
> > gate in on my (older, gate-modified) 800EG
> >
> > and of course + out of the EG is going to the CV on the 110 and
> GAIN is in
> > the 'bias region' with the CV pot maxxed.
> >
> > i just need to shape the volume envelope of a signal.
> >
>
>
>
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