<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="">Hi Pete,<div class=""><br class=""></div><div class="">The PDF came through fine. The list allows messages up to 1 MB.</div><div class=""><br class=""></div><div class="">Ben</div><div class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On 5 Oct 2020, at 18:23, Pete Hartman <<a href="mailto:pete.hartman@gmail.com" class="">pete.hartman@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">Not sure the list accepts attached PDFs....<br class=""><br class="">This is the doc for the filter in question, the schematic is the last page.<br class=""><br class="">Definitely not looking for a "general purpose" sub so much as a way to replace the unobtanium chip and retain the same function and character.<div class=""><br class="">Pete<div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div></div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Oct 5, 2020 at 4:57 AM Roman Sowa <<a href="mailto:modular@go2.pl" class="">modular@go2.pl</a>> wrote:<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">SSM2020 can be used in so many different ways and probably in your <br class="">
application it's only used in one of them. I mean it would be silly to <br class="">
recreate all possible signal and control inputs of SSM202 with other <br class="">
chips if in destination circuit it's wired to work in one specific way. <br class="">
So depending on what it does in this particular circuit, it may be <br class="">
easily replaced by either SSI2164, or AS3330, or AS 3360 or AS3363, or <br class="">
AS3364 or who know what else if not LM13700.<br class="">
<br class="">
I mean, making 1-to-1 clone of SSM2020 to fit in one specific circuit is <br class="">
like recreating working replica Yamaha GX-1 and use it only as a plant <br class="">
stand.<br class="">
<br class="">
If you show schematics of the device then possibly there will be 20 <br class="">
people offering help in replacement design.<br class="">
<br class="">
Roman<br class="">
<br class="">
W dniu 2020-10-02 o 17:08, info <a href="http://synthcube.com/" rel="noreferrer" target="_blank" class="">synthcube.com</a> pisze:<br class="">
> Greetings all<br class="">
> <br class="">
> A few years back we made 15V conversion PCBs for some of Analog <br class="">
> Metropolis 12V eurorack filter PCBs to use with Frac and 5U panels. The <br class="">
> AM2140 uses the SSM2020 VCA chip which of course is unobtainable, and <br class="">
> does not appear to be in the pipeline for Sound Semiconductor or Alfa <br class="">
> Rpar to re-make.<br class="">
> <br class="">
> We’d like to hear from you about what it would take to create an adapter <br class="">
> PCB to convert certain SMT components to a SSM2020 ‘work-alike’ <br class="">
> compatible with the thru-hole DIP spacing. Is anyone perhaps interested <br class="">
> in a small commission to design, prototype and test something?<br class="">
> <br class="">
> We asked Dan Parks from Sound Semiconductor , and his initial thought <br class="">
> was (paraphrased) ‘someone might be able to create a SSM2020 work-alike <br class="">
> using the SSM2164 or?”<br class="">
> <br class="">
> We then asked a good friend with superb technical chops and his thoughts <br class="">
> are below….<br class="">
> <br class="">
> /“The input to the SSM2020 is a differential voltage. The input to the <br class="">
> SSM2164 is a current. It is not clear to me what ranges would be <br class="">
> equivalent for the voltages vs the currents either, most OTAs want very <br class="">
> small inputs to avoid distortion. Honestly it might be easier to <br class="">
> duplicate it with an LM13700 and some transistor pairs; while some care <br class="">
> would have to be put into finding equivalents there too, it's a closer <br class="">
> architecture. The SSM2020 is using the transistor mirror at the bottom <br class="">
> for control, that goes from linear input to exponential current for the <br class="">
> control, just like in a VCO's expo converter” /<br class="">
> <br class="">
> //<br class="">
> <br class="">
> Thanks-<br class="">
> <br class="">
> Chris<br class="">
> <br class="">
> synthCube<br class="">
> <br class="">
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</blockquote></div>
<span id="cid:f_kfwqpuwf0"><AM2140 Project Notes v1.1.pdf></span>_______________________________________________<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=""></div></blockquote></div><br class=""></div></body></html>