Motor speed control circuit

A shortcoming of the above bi-directional proportional motor control circuit is that with the potentiometer in its center position the motor does not stop, but creeps due to the difficulty in setting the potentiometer for an exact 1:1 mark-space ratio from the flip-flop. This modified circuit uses a second potentiometer, ganged with the first used to inhibit drive to the motor near the center position.

This potentiometer is connected between the supply lines and feeds a window comparator which in turn drives the inhibit input of the L293.

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