Schematic of 555 timer PWM
R2
Resistance
Resistance
LED1
U1
C2
Capacitance
10uF
C1
Capacitance
100uF
D1
C3
Capacitance
1uF
R1
Resistance
330 Ω
D2
C4
Capacitance
0.1uF
SW1
BAT1
R3
Resistance
10kΩ