Circuit to simulate PWM?

Does anyone know of a circuit design that will simulate PWM (pulse
width modulation) for controlling DC motors? I've looked into this,
and I know this can be done fairly easily with microcontrollers, but I
figured there must be a way to do this without a logic controller.

I'm thinking a variable resistor to control the frequency of the
pulses/capacitor charging, capacitors to hold the charge between
pulses.

Uh, yes.. I'm a total newbie.. but I'm very interested in learning.

I had some electronics theory (minimal) in physics when I went to
University, but that was a good number of years ago. I was thinking of
picking up a couple of those 'Evil Genius' books. Anyone have any
comment on them?

Thanks in advance!

Troy

.

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