Re: [sdiy] VCA mixer ?

[Roman]

There's an IC for something smaller - SSM21something,
digitally controlled 8x2 mixer. Our Batz was making featurefull MIDI mixers using that one. Maybe a small matrix of those might do...

I'd say 2 VCAs per input with 1x8 mux on each, that gives lots of possibilities and only 32VCAs used.
And the VCA - SSM2164 (would I recommend something else?, me, 2164 freak...). That's 8 chips per 5$

Roman

---- Wiadomość Oryginalna ----
Od: Merlin Zener <merlin at merlinzener.com>
Do: Synth-Diy list <synth-diy at dropmix.xs4all.nl>
Data: 29 Sep 2003 05:49:04 +0700
Temat: [sdiy] VCA mixer ?

>
>Hi,
>
>I had an idea, and I don't know how feasible it is, so I thought I'd ask
>you guys to comment:
>I was thinking of having a 16 input, 8 output mixer for my keyboard rig,
>and having no knobs on it, just make it in a 1RU box with a MIDI in and
>set up a panel in Cakewalk to control it.
>
>Obviously the first consideration would be the 128 VCAs - there's costs
>and noise/distortion issues to think about. Then 24 buffer opamp stages
>for the inputs and outputs [balanced outs would be good]. And possibly
>24 led level meters on the front for the ins/outs too. And then a little
>bit of circuitry to take the MIDI in and spit out the 128 control
>voltages for the VCAs. Btw for my purposes I'm not worried about tone
>controls, I just need to send different signals to different places for
>different songs.
>
>What do you guys think?
>What VCAs to look at?
>Or is there a different way - maybe some kind of voltage controlled
>resistive element, so I could have each input channel go through the
>buffer stage, then to the control elements, then to a summing amp?
>Any thoughts on the MIDI control side?
>
>Has it already been done?
>Are there some products I could look at?
>
>TIA for any comments and advice :)
>
>--
>Merlin Zener
>Piano, Synthesizer
>Thailand.
>
>registered Linux user number 328618
>
>