Now this is an interesting one. I have mostly completed the voice card layout - it is untested and will surely have a lot of adjustments before I route it and send it to production, but this is what I will base my breadboard testing on going forward.
PS: There are a lot of comments here and nothing is guaranteed to work!
Some quick facts:
- 60 CVs
- 50 digital control signals
- 9 trim CVs or alternatively additional trim pots
- 16-22 SPDT switches
- 21-31 SPST switches
I have yet to see if I can have both OTA and ladder filters. We'll see.
Anyway, here is the complete voice card - but without the controller and CV generation. When doing the real PCB I suspect the controller/CVs and DCOs will be placed on a separate board just as with the prototype controller, it works very well and keeps most fast moving digital signals away from the analog circuitry.
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