On Thu, 28 May 2009 10:56:25 -0300, "Bruno L. Albrecht"
<brunolalb@gmail.com> said:
> not exactly...actually is just part of a major final project...
> anyway...help?

A single-ended differentiator followed by an integrator will do
frequency to voltage. To do stable motor speed control you will also
need at least one or two parts of a PID circuit, depending on how
sloppy/fast/accurate you need it to be. See Bob Pease's articles about
PID and "ball balancing on beam" for opamp PID circuits.

Cheers,

Bob

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