[sdiy] SPV-355 -15V rail issue

brianw brianw at audiobanshee.com
Mon Jun 19 05:10:49 CEST 2023


Although the VCO is surely bespoke, I was thinking that the VCF and/or VCA might be one of those dedicated chips that perform individual functions. Do you have a link to the schematic? I'd be curious to see how the VCF and VCA are implemented.

Brian


On Jun 17, 2023, at 8:54 PM, Adam wrote:
> I don't think there's any "vintage synth chips" in this, is there? It's basically a pitch to CV converter driving a VCO/VCF/VCA  with envelope control, same era as the SH-09 monosynth.
> 
> Actually just looking at the schem now, I'd always assumed they used a Phase Locked Loop in there but I can't see one.
> 
> One thing I do see in there that is virtually unobtainium is a Fairchild uA726, IC18
> 
> <grab 2023-06-18 at 1.52.50 pm.png>
> 
> 
> 
> Unless someone has managed to clone that in recent years..?
> 
> A




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