Bi-directional motor control

Posted on Feb 16, 2013

The control of both direction and of proportional motor speed is achieved by rotation of a single potentiometer. The motor driver is an SGS integrated circuit L293 which will drive up to 1 amp in either direction, depending on the logic state of input 1 and input 2 as per table. I/P 1 I/P 2 Function. High Low Motor turns one way. Low High Motor reverses. By applying a variable M/S ratio flip-flop to these inputs, both speed and direction will be controlled. With RV1 in its center position the M/S will be 1:1 whereby the motor will remain stationary due to its inability to track at the flip-flop frequency.

Bi-directional motor control
Click here to download the full size of the above Circuit.

Movement of RV1 in either direction will gradually alter the M/S ratio and provide an average voltage bias in one direction proportional to the M/S ratio.

Leave Comment

characters left:

New Circuits



Popular Circuits

12 Volt 20 Amp Solar Charge Controller
8 Note Tune Player
Church bell Controller with ATmega32
solar charger circuit diagram
8 function christmas lamp
Fully Integrated Hall Effect-Based Linear Current Sensor With High Voltage Isolation And A Low-Resistance Current Conductor
Overheat Detector Alarm Switch
Vacuum tube audio amplifier
Pathfinder is one of the blind LM567 KD56022