modified 7 hours ago

Pulse generator with duty and variable frequency

00:12:26

A simple  compound oscillator for generating a stable frequency while duty cycle is adjusted. Useful for driving brushed dc motor by PWM control.
The circuit as shown here is not tested yed but its simulation is coherent with the expectations.
The output of the seconf NE555 used as monostable is suitable for driving a power Mosfet like IRFZ44N thus it could be used for controlling a micro lathe DC motor speed aiming to keep its torque high enough even when rotation is set at low RPM. 
I will probably upgrade this schematic with the power stage for those that would like to try for any purposes.

published 7 hours ago

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