Electronics Circuit Diagram

The following schematic shows the Simple Design of PWM Speed Control Circuit using LM555H. The LM555H is wired as an astable and the frequency is constant and independent of the duty cycle.

PWM Speed Control Circuit Parts List:
R1____1K
R2____20K
R3____1K
C1____10nF
C2____47nF
C3____100uF
Q1____IRF540
D1____1N4007GP
D2____1N4001GP
Vcc___12 Volts
U1____LM555H

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