[sdiy] Difference between early and late revisions of the CEM3340?

Oakley Sound oakleysound at btinternet.com
Tue Feb 25 16:46:37 CET 2020

The rev G should work fine. The key will be finding the right absolute 
pitch controlled by the single resistor (R12 or R30) that connects the 
+15V line to the summing node. Play with the value a bit and it'll lock 
on. Try 750K or 1M5.

The problem is that the autotune is very primitive. It only tunes to the 
top C and there's no scaling adjustment like the OB-8, JP-6 or Prophet 
5/10. And the capture range is quite small, at about an octave.



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