[sdiy] dual vco

[Harry Bissell]

I've tried to use two sections of the same chip in two different
VCOs. They usually sync and it cannot be completely avioded, as they share
"real estate" and especially power pins. Decoupling the power supplies
is not effective in fixing the problem.

Even the 4013 might be affected. There is a "CMOS Theremin" that uses
4093 gates as oscillators, they MUST be in different packages or they lock
for sure (a fatal flaw in a theremin, na ?)

H^) harry

----- Original Message -----
From: Ian Fritz <ijfritz at comcast.net>
To: Synth-diy at dropmix.xs4all.nl
Sent: Thu, 8 Apr 2010 10:03:49 -0400 (EDT)
Subject: [sdiy] dual vco

Has anyone made a pair of VCOs using dual chips?  I have one running using 
LM13700, TL072, CD4013, etc.  The two oscillators sync up a bit, and I'm 
not sure if this intrinsic or due to still being on a whiteboard.

Ian

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-- 
Harry Bissell & Nora Abdullah 4eva