PWM DC motor speed control circuit

Circuit works: At present, although the most commonly used method is to pulse width modulation speed, but the circuit is a pulse position modulation (when known as pulse modulation).

Manifold 555 in here to pick a square wave modulator 3 feet output pulse width is fixed 0.5 ms (by the R., C. The time constant). Thus, the duration of each pulse through the VT the electric machine is turned on 0.5 ms. Most of this time is sufficient to start the motor.

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