[sdiy] SSM2020- work-alike SMT to thru-hole conversion pcb?

[Ben Stuyts]

Hi Pete,

The PDF came through fine. The list allows messages up to 1 MB.

Ben


> On 5 Oct 2020, at 18:23, Pete Hartman <pete.hartman at gmail.com> wrote:
> 
> Not sure the list accepts attached PDFs....
> 
> This is the doc for the filter in question, the schematic is the last page.
> 
> 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.
> 
> Pete
> 
> 
> 
> 
> On Mon, Oct 5, 2020 at 4:57 AM Roman Sowa <modular at go2.pl <mailto:modular at go2.pl>> wrote:
> SSM2020 can be used in so many different ways and probably in your 
> application it's only used in one of them. I mean it would be silly to 
> recreate all possible signal and control inputs of SSM202 with other 
> chips if in destination circuit it's wired to work in one specific way. 
> So depending on what it does in this particular circuit, it may be 
> easily replaced by either SSI2164, or AS3330, or AS 3360 or AS3363, or 
> AS3364 or who know what else if not LM13700.
> 
> I mean, making 1-to-1 clone of SSM2020 to fit in one specific circuit is 
> like recreating working replica Yamaha GX-1 and use it only as a plant 
> stand.
> 
> If you show schematics of the device then possibly there will be 20 
> people offering help in replacement design.
> 
> Roman
> 
> W dniu 2020-10-02 o 17:08, info synthcube.com <http://synthcube.com/> pisze:
> > Greetings all
> > 
> > A few years back we made 15V conversion PCBs for some of Analog 
> > Metropolis 12V eurorack filter PCBs to use with Frac and 5U panels. The 
> > AM2140 uses the SSM2020 VCA chip which of course is unobtainable, and 
> > does not appear to be in the pipeline for Sound Semiconductor or Alfa 
> > Rpar to re-make.
> > 
> > We’d like to hear from you about what it would take to create an adapter 
> > PCB to convert certain SMT components to a SSM2020 ‘work-alike’ 
> > compatible with the thru-hole DIP spacing. Is anyone perhaps interested 
> > in a small commission to design, prototype and test something?
> > 
> > We asked Dan Parks from Sound Semiconductor , and his initial thought 
> > was (paraphrased)  ‘someone might be able to create a SSM2020 work-alike 
> > using the SSM2164 or?”
> > 
> > We then asked a good friend with superb technical chops and his thoughts 
> > are below….
> > 
> > /“The input to the SSM2020 is a differential voltage. The input to the 
> > SSM2164 is a current. It is not clear to me what ranges would be 
> > equivalent for the voltages vs the currents either, most OTAs want very 
> > small inputs to avoid distortion. Honestly it might be easier to 
> > duplicate it with an LM13700 and some transistor pairs; while some care 
> > would have to be put into finding equivalents there too, it's a closer 
> > architecture. The SSM2020 is using the transistor mirror at the bottom 
> > for control, that goes from linear input to exponential current for the 
> > control, just like in a VCO's expo converter” /
> > 
> > //
> > 
> > Thanks-
> > 
> > Chris
> > 
> > synthCube
> > 
> > 44 north road #50, second floor
> > 
> > bedford, ma 01730  usa
> > 
> > +1 781-538-6519 main
> > 
> > +1 781-538-6521 fax
> > 
> > +1 248-890-1905 mobile
> > 
> > www.synthcube.com/cart <http://www.synthcube.com/cart> <http://www.synthcube.com/cart <http://www.synthcube.com/cart>>
> > 
> > 
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