<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Ok, so the AS3320 has a slightly different frequency range and you might run out of frequency offset trimmer in some cases?<div class=""><br class=""></div><div class="">Once it is trimmed in, has anyone tried a “can you spot the Alfa chipping amongst the CEM voices?” test?</div><div class=""><br class=""></div><div class="">Thanks,</div><div class="">Tom</div><div class=""><br class=""><div class="">
<div>==================<br class=""> Electric Druid<br class="">Synth & Stompbox DIY<br class="">==================</div><div class=""><br class=""></div><br class="Apple-interchange-newline">
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<div><br class=""><blockquote type="cite" class=""><div class="">On 29 Jan 2021, at 10:34, John Staapel <<a href="mailto:j.staapel@gmail.com" class="">j.staapel@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div dir="ltr" class="">The AS3340 has the problems with PWM. I use an external opamp to solve that.<div class="">The CEM 3320 can be replaced by the V3320 and AS3320 . The AS3320 has a slightly different frequency setting. </div><div class="">The 3280 used in a filter has the same effect , a slightly different frequency setting</div><div class=""><br class=""></div><div class="">JS</div></div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Op vr 29 jan. 2021 om 04:31 schreef Markus via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" class="">synth-diy@synth-diy.org</a>>:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class=""><div style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:16px" class=""><div class=""></div>
<div dir="ltr" class=""><div class=""><div dir="ltr" class="">Hi all,</div><div dir="ltr" class=""><br class=""></div><div dir="ltr" class="">I built a module based on the AS3320 from scratch and the schematics looks exactly the same in the CEM3320 specification. so I would say you can replace these including the weird max. 2V resonance CV.</div><div dir="ltr" class=""><br class=""></div><div dir="ltr" class="">side note:</div><div dir="ltr" class="">as was said below between the AS3340 and CEM3340 the only difference seems to be the resistor on the PWM output pin 4 (AS 51k vs CEM 10k). you might also want to add some op amps and zener diode to get all waveform outputs up and down to the same level e.g. 0 - 10V...</div><div dir="ltr" class=""><br class=""></div><div dir="ltr" class=""><br class=""></div><div dir="ltr" class="">gruss,</div><div dir="ltr" class="">Markus</div></div></div><div class=""><br class=""></div>
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On Thursday, January 28, 2021, 07:07:46 PM PST, Jay Schwichtenberg <<a href="mailto:jschwich53@comcast.net" target="_blank" class="">jschwich53@comcast.net</a>> wrote:
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<div class=""><div id="gmail-m_1733962804344841872yiv9905026860" class="">
<div class=""><p class="">Yep, me bad, sorry.</p><p class="">Jay<br class="">
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<div class="">On 1/28/2021 3:18 PM, ColinMuirDorward
wrote:<br class="">
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<blockquote type="cite" class="">
<div class="">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 class="">
<div class="">
<div dir="ltr" class="">On Thu, Jan 28, 2021, 4:12 PM
Michael E Caloroso, <<a rel="nofollow noopener noreferrer" href="mailto:mec.forumreader@gmail.com" target="_blank" class="">mec.forumreader@gmail.com</a>>
wrote:<br class="">
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<blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex" class="">Are you sure
the PWM issue is the AS3320 and not the AS3340?<br class="">
<br class="">
MC<br class="">
<br class="">
On 1/28/21, Jay Schwichtenberg <<a rel="nofollow noopener noreferrer" href="mailto:jschwich53@comcast.net" target="_blank" class="">jschwich53@comcast.net</a>>
wrote:<br class="">
> I would go and read what's on Muffs about it.<br class="">
><br class="">
> With the original AS3320 there are issues with the PWM
affecting the<br class="">
> frequency. To resolve the problem it seems people had to
add negative<br class="">
> voltage regulator (think it's -5V if I remember
correctly).<br class="">
><br class="">
> Then CEM and new AS chips seem to be better.<br class="">
><br class="">
> Jay S.<br class="">
><br class="">
> On 1/28/2021 10:46 AM, Tom Wiltshire wrote:<br class="">
>><br class="">
>> Does anyone have any experience to offer having tried
this? Are the<br class="">
>> old and new chips close enough to be direct
replacements? Or maybe<br class="">
>> with a bit of trimming?<br class="">
>><br class="">
>> There seems to have been a lot of focus on the AS3340
as a replacement<br class="">
>> chip (and there are a few little differences) but I
haven’t seen or<br class="">
>> read much about the AS3320 as a drop-in replacement.<br class="">
>><br class="">
>> Of course, changing all the filters to maintain
consistency is a<br class="">
>> possibility, and then you have a few genuine CEMs for
the next repair!<br class="">
>><br class="">
>> Thanks,<br class="">
>> Tom<br class="">
>><br class="">
>> ==================<br class="">
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