Bidirectional Speed Control for DC Motors

Rajkumar Sharma
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SKU: EL115624
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This is a very simple bidirectional speed control of a small DC brushed motor. The project is built using power OPAMP TCA0372 which can drive a load up to 1A. Connecting a small DC motor and trimmer pot will control the motor forward/reverse operation along with speed control. A Trimmer potentiometer is provided to set the speed and direction of the motor. The motor is stopped when the potentiometer is in the center, turn the pot clockwise to run the motor in the forwarding direction, turning the pot counterclockwise will run the motor in the reverse direction. Operating power supply 12V DC.

Note: Motor control is also possible using a joystick. Trimmer pot can be replaced with Joystick using optional connector CN2.

Features

DC Motor 6-12V DC
Maximum Motor current up to 1A
Operating Power Supply 12V DC
Single Trimmer Pot Controls CCW/CW and Speed Control
Potentiometer Can be Replaced with Joystick
PCB dimensions: 27.62 x 24.92 mm

Schematic

Parts List

NO.	QNTY.	REF.	DESC.	MANUFACTURER	SUPPLIER	PART NO
1	1	CN1	2 PIN MALE HEADER PITCH 2.54MM	WURTH	DIGIKEY	732-5315-ND
2	1	CN2	3 PIN MALE HEADER PITCH 2.54MM	WURTH	DIGIKEY	DNP
3	1	C1	100uF/16V SMD TANTLUM	KEMET	DIGIKEY	399-18082-1-ND
4	1	C2	0.1uF/50V SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
5	1	D1	LED RED SMD SIZE 0805	LITE ON INC	DIGIKEY	160-1427-1-ND
6	1	MG1	2 PIN MALE HEADER PITCH 2.54MM	WURTH	DIGIKEY	732-5315-ND
7	6	R4,R5,R6,R7,R9,R10	10K 5% SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
8	1	R1	1K 5% SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
9	2	R2,R8	0E SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
10	1	R3	5.1E/5E 1W SMD SIZE 2512	MURATA/YAGEO	DIGIKEY
11	1	U1	TCA0372	ONSEMI	DIGIKEY	TCA0372DWR2GOSCT-ND
12	1	PR1	10K TRIMMER POT	KYOCERA	DIGIKEY	478-601030-ND