PWM using 555 timer.
Schematic - http://www.dprg.org/tutorials/2005-11a/index.html
I used a 220 resistor before the pot to limit current when pot is at max either way, and a 10k pot. and my output goes to a l298 dual H bridge that drives the motor. Not pin 7
The 10k pot will be replaced by a AD5220 digital 10k pot to control motor speed via a BASIC Stamp 2
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