<div dir="ltr">
<div>>>Is that just the AS3340 or the CEM3340 as well?</div><div><br></div><div>My understanding is that some but not all cem3340 suffered from the same problem (some early versions?) Even for the as3340, I wondered if there are varying degrees of the problem. <br></div><div><br></div><div>I chatted with a rep at Alfa Rpar a couple years ago and tried to convince him to do a TZ 3340 version. He said something like "oh that looks easy enough", but of course they did the 3396 and whatnot, instead. It would be amazing if they solved the PWM/pitch issue and added linear TZ in one fell swoop. Then we might have drop-in TZ upgrades to existing gear that uses the linear FM input.<br></div>
</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Mar 27, 2021 at 7:34 PM cheater cheater <<a href="mailto:cheater00social@gmail.com">cheater00social@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">>> On 27 Mar 2021, at 18:19, cheater cheater <<a href="mailto:cheater00social@gmail.com" target="_blank">cheater00social@gmail.com</a>> wrote:<br>
>><br>
>> Thanks. was the original CEM3320 equally easy to damage? Did the other<br>
>> chips have similar problems in their original versions?<br>
>><br>
<br>
<br>
On Sat, Mar 27, 2021 at 7:48 PM Tom Wiltshire <<a href="mailto:tom@electricdruid.net" target="_blank">tom@electricdruid.net</a>> wrote:<br>
><br>
> Yes, the early CEMs were just the same, and the early SSMs were worse, since Dave Smith had to move the Prophet 5 from one chipset to the other to get it to stay in tune.<br>
><br>
> The current CEM3340 is Rev.G. My understanding is that Rev.G was only a datasheet change and an acknowledgement that some of the claimed figures for Rev.F weren’t likely in practice, but that still means there were five versions fixing earlier problems. I think that’s worth bearing in mind when we compare chips from Coolaudio and Alfa with the originals. We’re comparing later versions with early versions in most cases. CEM took a decade to get the chips to the final state that we’re judging against.<br>
<br>
I thought what these companies did (CoolAudio aka Uli Behringer, ALFA,<br>
SSI) was take photos of the old chips and re-issue them based off<br>
that?<br>
<br>
> BTW, there’s a good application note now for the PWM problem:<br>
><br>
> <a href="https://www.alfarzpp.lv/eng/sc/AS3340%20tip%20VCO%20_%20PWM%20.pdf" rel="noreferrer" target="_blank">https://www.alfarzpp.lv/eng/sc/AS3340%20tip%20VCO%20_%20PWM%20.pdf</a><br>
><br>
> I’m sure it’s not the only solution. I’d like to see something like this integrated onto the silicon and an AS3340 Rev.B get released. Fixing things is not a failure, but a success. No-one expects everything to be perfect first time. It’s what you do next that counts.<br>
<br>
(...which may or may not mean reissues are impossible)<br>
<br>
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