[sdiy] Dual Log/Linear Irwin-Gallo VCA

[Jay Schwichtenberg]

All,

Would anyone like to comment on the CV feed-thru and/or any issues on
trimming these when using them on a VCA?

Thanks in advance.
Jay S.

> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl
> [mailto:synth-diy-bounces at dropmix.xs4all.nl]On Behalf Of Tim Parkhurst
> Sent: Friday, July 03, 2009 12:41 PM
> To: David G. Dixon
> Cc: synth diy
> Subject: Re: [sdiy] Dual Log/Linear Irwin-Gallo VCA
>
>
> On Fri, Jul 3, 2009 at 12:32 AM, David G.
> Dixon<dixon at interchange.ubc.ca> wrote:
> > I'm very happy to report that my latest module, a dual
> log/linear VCA based
> > on a modified Irwin-Gallo circuit using linearized 2164s, is up
> and running
> > perfectly.  Scope images look exactly like my simulations.
> >
>
> Agreed, the 2164 is a great chip. I've designed a VCO around it that
> has monster range (400,000:1), and this chip is a big part of the
> reason why the Mankato VCF has such a wide frequency range. The 2164
> is quiet, cheap, and easy to use.
>
> <self promotion>
> Magic Smoke also sells the CoolAudio 2164 chip for $3.50 each (1 or
> 2), $3.25 ea (2 to 5) or $3.00 ea (6 to 10). If you need 11 or more,
> we could probably knock a few more pennies off. :-)
> </self promotion>
>
>
> Tim (always willing to sell a few parts) Servo
> --
> "Sire, the church of God is an anvil that has worn out many hammers."
> - H.L. Hastings
>
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