[sdiy] simple 2164 linear to expo CV?

Neil Harper metadata at gmx.com
Wed Nov 13 22:49:41 CET 2019

On 11/13/19 4:37 PM, David G Dixon wrote:
> Hi Neil,
> All Intellijel VCOs (Dixie, Rubicon, Atlantis) use the 2164 as an
> exponential converter, and they have a reputation for excellent 1V/octave
> tracking.  I have been told that it can be made to track 12 octaves,
> although I've never gotten better than about 8 octaves personally, which is
> still more than enough for analog synths.
> The Intellijel uVCA (and Quad VCA) is fully adjustable between exponential
> and linear control.  These could be fed with a DC voltage to get the effect
> you desire.  I believe that Mutable has a similar module.

thanks david,

i was just hoping to bang out something quick myself that didn't need
1V/oct tracking. just for amplitude control and "good enough for the ears".

i'm guessing the uVCA use a 2164 right? so I could feed a 2164 a DC
voltage to get a rough exponential CV out of it. i know it wouldn't
track a VCO, but that's not my intention.

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