[sdiy] Careful with the CEM3320s [was: Re: Yamaha CSY-2 solo synthesizer]

lanterma at ece.gatech.edu lanterma at ece.gatech.edu
Wed Nov 10 22:31:15 CET 2010


On Nov 10, 2010, at 2:51 PM, Richard Atkinson wrote:

> Indeed. Even if they are similar circuits, it's not unreasonable for them to sound different from either the NE diode bridges or the IG state variable filters. After all, SSM2040s are simply quad cascaded OTA filters, as are some IR3109 and CEM3320 configurations, but no-one accuses them of sounding the same :)

Be cautious with the CEM 3320 - the gain cells in it aren't usual voltage-in, current-out OTAs. They're current-in, current-out devices that have some strange biasing requirements. I don't recall seeing anything else like them.

- Aaron


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