[sdiy] Aries AR-327 Mutli-mode VCF help needed

[Tony Kalomiris]

Hi list,

Bought a complete service manual on the 300 series but it was missing the schematic and component overlay for this particular module only.
I managed to figure out what most of the trimmers were for - coarse/fine Fc, Resonance adj, and offset null on the LM301. I scoped the outputs, that helped somewhat.

Any help would be greatly appreciated.

Incidentally, I really enjoyed working on this system and learned a lot from the excellent construction and theory of operation sections  in the manual..worth getting just for that.

Tony K