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Schematic of 555 timer PWM
C4
Capacitance
0.1uF
LED1
U1
R1
Resistance
330 Ω
C2
Capacitance
10uF
SW1
C1
Capacitance
100uF
D1
C3
Capacitance
1uF
R3
Resistance
10kΩ
D2

555 timer PWM

555 timer PWM thumbnail