Pulse Width Modulation DC Motor Control

This simple pulse width modulation DC motor controls the motor speed by driving the motor with short pulses. These pulses vary in duration to change the speed of the motor. The longer the pulses, the faster the motor turns, and vice versa.

Part Total Qty. Description Substitutions

R1 1 1 Meg 1/4W Resistor
R2 1 100K Pot
C1 1 0.1uF 25V Ceramic Disc Capacitor
C2 1 0.01uF 25V Ceramic Disc Capacitor
Q1 1 IRF511 MOSFET IRF620
U1 1 4011 CMOS NAND Gate
S1 1 DPDT Switch
M1 1 Motor
MISC 1 Case, Board, Heatsink, Knob For R2, Socket For U1