source. The circuit is built around a famous NE555 IC which is a low cost IC and can be easily found at your local electronics store.
In this circuit the 555 Timer IC is connected as a astable multivibator and a 12 volt relay is derived through the pin 3 of the IC. The IC generates continues pulses at pin 3 which will activate and deactivate or flash the relay accordingly. The flashing rate per second can be controlled by the 100K variable resistor.
The circuit can be operated with 6, 9 or 12V DC but make sure to use the same voltage relay when operating with 6 or 9 volts. . In the place of load you can connect any appliance which you want to ON and OFF.
Here is a very simple and useful schematic of a relay flasher circuit. The circuit can perform variety of flashing tasks for example it can be used as a car or motorcycle brake light flasher, headlight flasher, lamp flasher circuit, LED flasher circuit and able to continuously flash or ON and OFF any AC or DC