The average voltage will be supplied to the DC motor. To control the motor rotation is slow or fast. This circuit uses the above principle. By makes the pulse generator circuit or astable multivibrator Which consists of IC1 / 1 and IC1 / 2 inverter gate with C1, R1, R2, VR1 and diode D1, D2. The signal generator has the duty cycle value that can adjustable or can rotate with VR1 there.