<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="">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.<div class=""><br class=""></div><div class="">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.</div><div class=""><br class=""></div><div class="">BTW, there’s a good application note now for the PWM problem:</div><div class=""><br class=""></div><div class=""><a href="https://www.alfarzpp.lv/eng/sc/AS3340 tip VCO _ PWM .pdf" class="">https://www.alfarzpp.lv/eng/sc/AS3340%20tip%20VCO%20_%20PWM%20.pdf</a></div><div class=""><br class=""></div><div class="">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.</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><div><blockquote type="cite" class=""><div class="">On 27 Mar 2021, at 18:19, cheater cheater <<a href="mailto:cheater00social@gmail.com" class="">cheater00social@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">Thanks. was the original CEM3320 equally easy to damage? Did the other<br class="">chips have similar problems in their original versions?<br class=""><br class="">On Sat, Mar 27, 2021 at 4:46 PM Benjamin Tremblay <<a href="mailto:btremblay@me.com" class="">btremblay@me.com</a>> wrote:<br class=""><blockquote type="cite" class=""><br class="">I have not tried the VCO, but have had great results with the 3320 VCF and the 3360 VCA. It’s pretty much Pro One for the masses.<br class="">The 3320 is easy to damage if you over-power the resonance control.<br class="">The 3360 can be tamed once you work within the correct control voltage range.<br class="">I’m an idiot. I don’t have a scope. But they sound great and I was able to get them stood up and move on to the rest of my project.<br class=""><br class="">I’m also using a number of AS2164 chips. I have never used other brands, but these work great for computer-controlled mixers of analog signals.<br class="">I made no effort to squeeze any gain out of them using negative voltage bias on the control pins. They work fine for my application.<br class=""><br class="">I still have some 3330 VCA chips. They were very frustrating to use. They seem to require a low-impedance voltage divider that gets very noisy without careful placement of capacitors.<br class="">Maybe if I go back and try to breadboard them after having learned the 3360 I could be more successful.<br class=""><br class="">On Mar 27, 2021, at 11:19 AM, cheater cheater <<a href="mailto:cheater00social@gmail.com" class="">cheater00social@gmail.com</a>> wrote:<br class=""><br class="">I was wondering if anyone had any experiences with ALFA clones of<br class="">classic chips. Are they good? Is anything missing? Are they very crap?<br class="">No difference at all? Any specific ones to watch out for?<br class=""><br class="">Thanks<br class="">_______________________________________________<br class="">Synth-diy mailing list<br class=""><a href="mailto:Synth-diy@synth-diy.org" class="">Synth-diy@synth-diy.org</a><br class="">http://synth-diy.org/mailman/listinfo/synth-diy<br class="">Selling or trading? Use marketplace@synth-diy.org<br class=""><br class=""><br class=""></blockquote><br class="">_______________________________________________<br class="">Synth-diy mailing list<br class=""><a href="mailto:Synth-diy@synth-diy.org" class="">Synth-diy@synth-diy.org</a><br class="">http://synth-diy.org/mailman/listinfo/synth-diy<br class="">Selling or trading? Use marketplace@synth-diy.org<br class=""></div></div></blockquote></div><br class=""></div></body></html>