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

[Michael E Caloroso]

Are you sure the PWM issue is the AS3320 and not the AS3340?

MC

On 1/28/21, Jay Schwichtenberg <jschwich53 at comcast.net> wrote:
> 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
>>
>> ==================
>>       Electric Druid
>> Synth & Stompbox DIY
>> ==================
>>
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>