Hi,
Thanks to Richard and John (and Larry!) for the helpful replies. I wasn't
too sure what circuit was being mention for the All Pass input, but after
re-reading -
Do you mean each of the three existing inputs on the PCB (LP/BP/HP) would
need an opamp mixer in order to sum the All Pass to each of the three said
inputs? Is this because a passive mixer would load the inputs? Sorry for the
technician part of me showing. ;-)
I'm curious...Is there anyone reading this that would be interested in
ordering this Stooge CGS Synthacon panel? If not, I might just have to go homebrew.
Thanks everyone,
Andrew Sanchez
In a message dated 3/10/04 8:21:04 PM Central Standard Time,
pugix@... writes:
> Andrew, you meant a second 220K resistor, not 220 ohm. I'm about to
> build my dual Synthacon VCF (two in 2U), and I'll be trying these CV
> resistors values, based on a suggestion by Mr. Loffink: 680R from base
> of 2N2222 to ground; 430K for the initial freq pot; 360K for the
> "1V/Oct" input'; 150K for the FM input with attenuator pot.
>
> I see from your proposed Stooge panel that you would put mixer pots on
> each of the inputs. If you make three simple mixers for the inputs, you
> can easily add an attenuator pot for the Allpass input. The mixer
> circuit is easy to visualize. The phase is inverted, but it probably
> doesn't matter. (Now will this drawing come through?)