[sdiy] SSM2040 vs CEM3320

René Schmitz synth at schmitzbits.de
Thu Nov 2 15:50:33 CET 2023

Hi Mark,

Am 02.11.2023 um 14:10 schrieb mark verbos:
> Don’t you mean 
> https://patents.google.com/patent/US4514704A/en?inventor=Douglas+R.+Curtis ? 
That is the "who the heck needs buffers?" filter as in CEM3372, and 
possibly others.

> I only say that because this is a filter and the one you posted is a 
> “linear/logarithmic analog multiplier”
> Anyway, cool stuff.
Hang a few caps to GND in strategic places and you get a filter. The 
description of the cascade of four stages later in the patent is a 



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