Auto-Arming Car Alarm circuit

The car alarm here is a simple circuit with basic characteristics that cover all entrances at the car that has switches (doors etc).With one switch (arm-switch) the circuit waits for the sensor-switches to open and to activate it. So the horn with 1 sec pulses will sound imediatelly seconds so the driver can enter in car and disactivate the arming switch.

As the sensor-swithes are closed again the alarm will be armed again automaticaly. The circuit is very simple and uses only transistors.

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