[sdiy] the obscure output of a 2164
David G Dixon
dixon at mail.ubc.ca
Sat Mar 11 05:18:25 CET 2017
I made it work (with one very cleverly controlled 2164). That's the basis
of the Intellijel Quadra circuit.
> -----Original Message-----
> From: rsdio at audiobanshee.com [mailto:rsdio at audiobanshee.com]
> Sent: Friday, March 10, 2017 6:02 PM
> To: David G Dixon
> Cc: Synth DIY
> Subject: Re: [sdiy] the obscure output of a 2164
> Is a VCA really equivalent to a voltage-controller resistor
> in all aspects?
> In other words, transconductance is not exactly the same
> thing as transresistance.
> Harry Bissel's Morph-Lag shows the two potentiometers with
> open connections on one end of each. Is it even possible to
> run a VCA in an equivalent manner?
> On Mar 10, 2017, at 4:58 PM, David G Dixon <dixon at mail.ubc.ca> wrote:
> > I tried to use to different 2164 VCAs as variable resistors
> to control
> > the attack and decay independently in a Morphlag circuit,
> and the two
> > VCAs interacted strangely such that I couldn't independently adjust
> > one without affecting the other.
> > In addition to the two 2164 VCAs having their outputs both
> feeding a
> > common Miller integrator inverting input, their inputs were also
> > treated fairly unconventionally, with 1k resistors and
> diodes pointing
> > in opposite directions. I think it was more the inputs
> that were the
> > problem than the outputs, because I have used 2164s with 30k input
> > resistors and outputs tied together in many circuits (including the
> > Rubicon) and this seems to work well.
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