The lamp will turn on from darkness into its maximum brightness and then goes back to dim. The lamp intensity is influenced by C3 capacitor. IC2 is an optoisolator, and IC1 acts as astable multivibrator. IC1 frequency can be changed by changing the values of R2 and C1.
Components list :
Diode D1-D5 : 1N4007
DIAC : DB3
Resistor R1 : 1k ohm
R2 : 100k ohm
R3-R4 : 10k ohm
R5 : 270k ohm
Resistor variable VR1 : 1M ohm
Polar capacitor C1 : 47uF/25 V
Capacitor C2 : 0.01 uF
Polar capacitor C3 : 470 uF/25 V
Polar capacitor C4 : 0.1 uF/400 V
Transistor SCR : TYN6004,4A,400 V
IC Timer IC1 : ne555
Optoisolator IC2 : MCT2E
Light bulb 220V AC
9V power supply
