CAR ANTI - THEFT GUARD

Here
is an easy-to-build car anti-theft guard. The circuit, shown in Fig. 1,
is simple and easy to understand. When key-operated switch S2 of the
car is turned on, 12V DC supply from the car battery is extended to the
entire circuit through polarity-guard diode D5. Blinking LED1 flashes to
indicate that the guard circuit is enabled. It works off 12V power
supply along with