[sdiy] Schmitz ADSR replace pots with CV control?

[Tom Wiltshire]

Now that's a circuit that is crying out for a little PIC with a comparator on it to get rid of all that messy logic.
You could clear up the two 4011's and the 4013 bistable, and probably reduce the number of op-amps too.

Since it only uses a single VCA, perhaps it would make sense to use two more to make a Irwin linearised VCA to feed the envelope to.

Then there's only one more VCA going spare…second envelope for filter?! ;)


On 26 Nov 2013, at 09:58, Neil Johnson <neil.johnson71 at gmail.com> wrote:

>>> Den 25 nov 2013 22:17 skrev "David G Dixon" <dixon at mail.ubc.ca>:
>>>> 
>>>> No, a single 2164 would do nicely, with one VCA to spare.  The response
>>>> would be exponential, as it should be for an envelope.
> 
> Or one 2164 gain cell and a dual mux:
> 
> http://www.sowa.synth.net/modular/vcaddsr.html
> 
> oooh.... Roman's back!!!
> 
> 
> Neil
> --
> http://www.njohnson.co.uk
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy