[sdiy] Recommendations for VCO circuits

[James Patchell]

Well, of course, I am pejudiced....but I have had extremely good luck with 
these circuits, and the first one doesn't require any hard to find or 
expensive components.

http://www.oldcrows.net/~patchell/synthmodules/vco.html

http://www.oldcrows.net/~patchell/synthmodulesII/200-1007.pdf

The second will track to within about 1 or 2 cents over 7 octaves (at 
least)...actually the first one is about the same...

At 12:37 PM 6/6/2004 -0400, Glen wrote:
>I hope this doesn't open a never-ending argument, but I'd like some
>suggestions for the best VCO circuits to build. I want to make a list of
>circuits to consider, and I have no experience with which ones work better,
>etc.
>
>To qualify for the list, they should be reasonably simple, and not use any
>unobtanium components. They should be fairly stable, have a good range
>(although they don't have to function as LFOs), and the schematics have to
>available for free download on the internet. I'm looking for excellent
>examples of saw-core, triangle-core, quadrature output, PWM, sine, and any
>other classic waveform and configuration you can think of. I'd eventually
>like to build one of each basic style, and I don't want to waste too much
>time with the circuits that don't perform quite so well. So, please steer
>me to the better designs.
>
>So any suggestions for this "Who's Who" of VCO circuits I want to compile?
>
>
>thanks,
>Glen
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         -Jim
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