[sdiy] Aaron Crams cem3394 interface question...

[Harry Bissell]

I don't think its so easy... the 3394 was intended to be used under CPU control, with charging
current and a sync pulse provided to make the "VCO" work. Its really a "DCO" and while this circuit
might operate, it will not be temperature (or otherwise) stable. The CPU in most cases also takes
care of auto-tuning the circuit.

The rest should work fine, I've built a similar circuit to test the 3394 for a guitar synth use...

H^) harry

----- Original Message -----
From: ordeish at aol.com
To: SDIY <synth-diy at dropmix.xs4all.nl>
Sent: Tue, 08 Jun 2010 08:49:41 -0400 (EDT)
Subject: [sdiy] Aaron Crams cem3394 interface question...

 Hi all. I have had a 3394 sitting around and decided I'd make this interface for it. Questions are:

1) What is the voltage value of the 4.7 uf capacitor off of pin 17? Also, what is a good rule of thumb in knowing this value?

2) The 560 pF and 33nf caps have no polarity, does this mean they are ceramic disc caps? 

The schematic is at http://electro-music.com/forum/phpbb-files/cem3394_v2_163.pdf

Also, what would the voltage value for the non polarized caps?

Thanks everyone. It is exciting to start getting into things more in depth like this... Finally takig the plunge from kits and such!!

Ed
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-- 
Harry Bissell & Nora Abdullah 4eva