Voltage surge protector Or Time delay circuit

A surge protector is an appliance/device designed to protect electrical devices from voltage spikes. A surge protector attempts to limit the voltage supplied to an electric device by either blocking or by shorting to ground any unwanted voltages above a safe threshold. This article primarily discusses specifications and components relevant to the type of protector that diverts a voltage spike to ground; however, there is some coverage of other methods.


555 Timer IC-1
Capacitor = 1000uF /25V-1,100uF/25V-2,103pf-1
Relay = 12 V-1
Transformer T1 = 9V
Resistor R1 = 2.2K-2,3.3K,1M-1
Transistor=NPN BC558-1
LED=Red and Blue
Voltage regulator=7812 IC-1

Circuit Diagram:



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