Motor speed control circuit

Posted on Aug 15, 2012

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.

Motor speed control circuit
Click here to download the full size of the above Circuit.

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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