The principle of this circuit is, whenever a magnet comes close to the sensor, then the sensor will flow the output voltage to IC1. The output voltage will activate the timer which will then activate the relay controlled by IC2.
Component List :
Diode D1 : 1N4001
Resistor R1 : 10k ohm
Resistor R2 : 470k ohm
Resistor R3 : 1k ohm
Resistor R4 : 47k ohm
Polar capacitor C1 : 2.2 uF/16V
Polar capacitor C2 : 470 uF/16V
Transistor T1 : SL100
IC1 : NE555
IC2 : CD4013
Relay RL1 : 12 V, 200 ohm
Magnetic Sensor
5mm LED
