[sdiy] Using AS3320 as a CEM3320 replacement in vintage polysynths

Jay Schwichtenberg jschwich53 at comcast.net
Thu Jan 28 23:10:50 CET 2021

I would go and read what's on Muffs about it.

With the original AS3320 there are issues with the PWM affecting the 
frequency. To resolve the problem it seems people had to add negative 
voltage regulator (think it's -5V if I remember correctly).

Then CEM and new AS chips seem to be better.

Jay S.

On 1/28/2021 10:46 AM, Tom Wiltshire wrote:
> Does anyone have any experience to offer having tried this? Are the 
> old and new chips close enough to be direct replacements? Or maybe 
> with a bit of trimming?
> There seems to have been a lot of focus on the AS3340 as a replacement 
> chip (and there are a few little differences) but I haven’t seen or 
> read much about the AS3320 as a drop-in replacement.
> Of course, changing all the filters to maintain consistency is a 
> possibility, and then you have a few genuine CEMs for the next repair!
> Thanks,
> Tom
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