[sdiy] Schmitz ADSR replace pots with CV control?

[Roman Sowa]

yes, and frankly I thought about making semi-digital envelope recently.
But:
1. PIC firmware retention is only 40 years ;)
2. pure logic control exhibits beauty of cleanness and reliability
3. I like it the way it is...

How about this usage of single SSM2164:
cell 1 - VCO
cell 2 - envelope
cell 2+3 - multimode filter
plus 1 transistor VCA ala Korg MS

Who's going to do the PCB for that?

Roman

W dniu 2013-11-26 12:26, Tom Wiltshire pisze:
> 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
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