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Home › Magazines › 2007 › July/August › 3 Amp PWM DC Motor Controller

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3 Amp PWM DC Motor Controller

Published in issue 367, July/August 2007

3 Amp PWM DC Motor Controller

This circuit is intended for motion control applications, a common occurrence in robotics! This affordable PWM DC Motor controller can control any PMDC motor specified at 12 V to 30 V and 3 Amps max. Motor direction is controlled with a slide switch and motor speed, with an ordinary potentiometer.

The circuit diagram in Figure 1 shows ICs type LMD18200 and SG3525 at the heart of the circuit. The SG3525 is a pulsewidth modulator control circuit and the LMD18200, an H-Bridge to enable the motor to be run in both directions.

Components

Resistors
R1 = 10kΩ
R2,R4 = 18kΩ
R3 = 2kΩ2
R5 = 330Ω
R6 = 2kΩ7
R7 = 1kΩ5
P1 = 10kΩ potentiometer
P2 = 100kΩ preset
 
Capacitors
C1,C2,C4,C5,C7, C9, C10 = 100nF
C3 = 18nF
C5 = 22μF 63F 
C6,C8 = 100μF 63V
 
Semiconductors
D1,D2 = LED
IC1 = SG3525AN
IC2 = LMD18200
IC3 = L7805ACV
 
Miscellaneous
K1,K2,K3 = 2-way PCB terminal block, lead pitch 5mm
S1 = slide switch
PCB, ref. 060339-1 from www.thepcbshop.com

Click below to download a PDF copy of this article from Elektor magazine.

 

Downloads 
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PCB layout
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Order from Elektor 
PCB, bare 060339-1
060339-1
Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.

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