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<p>Yep, me bad, sorry.</p>
<p>Jay<br>
</p>
<div class="moz-cite-prefix">On 1/28/2021 3:18 PM, ColinMuirDorward
wrote:<br>
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cite="mid:CAGV3gy4oK502Lr39bXrrwchxtQqYSibrcUKoZPx7y6Ph2AmE=w@mail.gmail.com">
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<div dir="auto">Jay is correct, but got his chips mixed up. The
PWM issue is definitely on the VCO (3340) chip! Tom is asking
about the vcf chip (3320) :)</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Thu, Jan 28, 2021, 4:12 PM
Michael E Caloroso, <<a
href="mailto:mec.forumreader@gmail.com"
moz-do-not-send="true">mec.forumreader@gmail.com</a>>
wrote:<br>
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<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Are you sure
the PWM issue is the AS3320 and not the AS3340?<br>
<br>
MC<br>
<br>
On 1/28/21, Jay Schwichtenberg <<a
href="mailto:jschwich53@comcast.net" target="_blank"
rel="noreferrer" moz-do-not-send="true">jschwich53@comcast.net</a>>
wrote:<br>
> I would go and read what's on Muffs about it.<br>
><br>
> With the original AS3320 there are issues with the PWM
affecting the<br>
> frequency. To resolve the problem it seems people had to
add negative<br>
> voltage regulator (think it's -5V if I remember
correctly).<br>
><br>
> Then CEM and new AS chips seem to be better.<br>
><br>
> Jay S.<br>
><br>
> On 1/28/2021 10:46 AM, Tom Wiltshire wrote:<br>
>><br>
>> Does anyone have any experience to offer having tried
this? Are the<br>
>> old and new chips close enough to be direct
replacements? Or maybe<br>
>> with a bit of trimming?<br>
>><br>
>> There seems to have been a lot of focus on the AS3340
as a replacement<br>
>> chip (and there are a few little differences) but I
haven’t seen or<br>
>> read much about the AS3320 as a drop-in replacement.<br>
>><br>
>> Of course, changing all the filters to maintain
consistency is a<br>
>> possibility, and then you have a few genuine CEMs for
the next repair!<br>
>><br>
>> Thanks,<br>
>> Tom<br>
>><br>
>> ==================<br>
>> Electric Druid<br>
>> Synth & Stompbox DIY<br>
>> ==================<br>
>><br>
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