Control the speed of any common DC motor rated up to 100V (7A). Operates on 5V to 15V. Uses NE556 to pulse-width modulate an IRF530 MOSFET. In this way motor torque is maintained. Adjustable speed control. Box mounted. Changed the MOSFET to an IRF530 so 100V motors could be used. But do not draw more than 7A thru the PCB tracks unless you thicken them.
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