DC Motor Speed Control via Pulse Width Modulation (PWM)

A homemade PWM circuit - with frequency and pulse width control - is driving a direct current (DC) electric motor.

An oscilloscope's probe is connected in parallel with the motor to view the shape of the impulses that are coming from the PWM box.

The rotations per minute (rpm) of the motor is increased by either increasing the frequency of the pulses or making the pulse width larger.

The shape of the pulses is less noisy (less distortion) if a diode is connected in series with the motor, and the PWM's fan is turned OFF.
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