HiJack car Alarm

  
This circuit is designed primarily for the situation where a hijacker forces the driver from the vehicle. If a door is opened while the ignition is switched on, the circuit will trip. After a few minutes delay - when the thief is at a safe distance - the alarm will sound and the engine will fail. Before fitting this or any other engine cut-out to your vehicle, carefully consider both the safety implications of its possible failure - and the legal consequences of installing a device that could cause an accident. If you decide to proceed, you will need to use the highest standards of materials and workmanship.
HiJack car Alarm - schematic

You`re going to trip this alarm unintentionally. When you do, the LED will light and the Buzzer will give a short beep. Its length is determined by C3. Its purpose is to alert you to the need to push the reset button. When you push the button the LED



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