Discrete component motor direction controller

Posted on Mar 6, 2013

This circuit can control a small DC motor, like the one in a tape recorder. When both the points A & B are `HIGH` Q1 and Q2 are in saturation. Hence the bases of Q3 to Q6 are grounded. Hence Q3,Q5 are OFF and Q4,Q6 are ON . The voltages at both the motor terminals is the same and hence the motor is OFF. Similarly when both A and B are `LOW` the motor is OFF.

Discrete component motor direction controller
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When A is HIGH and B is LOW, Q1 saturates ,Q2 is OFF. The bases of Q3 and Q4 are grounded and that of Q4 and Q5 are HIGH. Hence Q4 and Q5 conduct making the right terminal of the motor more positive than the left and the motor is ON. When A is LOW and B i

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