[sdiy] LM13700/LM13600-based filters

[Harry Bissell]

Hmmm... i seem to remember some simulations that ~work~ and the real circuits
won't. One more embassasing one was a dual clamp I designed using two opamps
(741).  A second look made me think... 'what limits the current source from feeding
unlimited current to the current sink ??'

answer, nothing. Standing current was about 250A ....   :^)

OTOH Spice says that my guitar pitch converter is unworkable. After two weeks I built
it and it worked great !

H^) harry


----- Original Message -----
From: David G. Dixon <dixon at interchange.ubc.ca>
To: 'Aaron Lanterman' <lanterma at ece.gatech.edu>, 'synth-diy diy' <synth-diy at dropmix.xs4all.nl>
Sent: Tue, 27 Apr 2010 00:18:49 -0400 (EDT)
Subject: Re: [sdiy] LM13700/LM13600-based filters

> Random observation: the op amp inputs on the highpass and bandpass
> topologies on the 1st page are flipped.
> 
> I only mentioned this since I've done that a whole lot myself, and
> suffered mightily for it. ;)

Yes, I seem to remember something about expensive PC boards ordered with
this error in several places.  Sometimes learning the hard way sucks!

In any case, this is probably the best reason to use simulation software to
draw schematics.  That way, you know your schematic is correct when the
simulation works.

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-- 
Harry Bissell & Nora Abdullah 4eva