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

[Roman Sowa]

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 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
> 
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