PWM with 555



One of the method of speed control is PWM or pulse width modulation. Pulse width modulation is the process of switching the power to a device on and off at a given frequency, with varying on and off times. This circuit can be used to control the speed of a motor by adjusting the duty cycle of the pulses sent to the motor.



R1
2k2
R2
2k2
R3
10
R4
100k
RV1
1M




C1 1500pF
C2 47nF
C3 100uF/25
C4 100nF
C5 470nF




U1 LM555
Q1 MTP3055
D1 1N4158
D2 1N4158
D3 1N4007
D4 BY255
D5 By255






Copyright C 2009 | Design of William Puentes