Here is the circuit diagram of car headlight alarm. This device can be set for one or two functions:
First, to indicate that the head lights (or the side lights) should be switched off after switching off the ignition contact. With this circuit, there should be no dead battery due to headlights that were left on.
Second, to indicate that the head lights should be on once ignition contact is switched on.

Car Headlight Alarm

Components List:

D1,D2,D3,D4,D5,D6,D7 : 1N4148D8,D9 : 1N4007ZD1 : 2V4R1,R2,R3,R4 : 47KR5 : 220KR6,R7 : 470R8,R9 : 10KR10 : 1MC1 : 100nFC2,C3,C4,C5,C6 : 22?F/16VC7 : 470?F/16VT1 : BC547BIC1 : CD40106IC2 : CD4070Buz1 : Buzzer


Car Headlight Alarm Features:

  • Continuously repeated alarm tone for lights ON (may be disabled)
  • Repeated alarm tone for lights OUT
  • Only 3 wires are required for hook-up

This circuit come from Velleman product kit. Download the kit manual of Velleman car headlight alarm from the following link:
Car Headlight Alarm Circuit 557.34 KBDownload Kit Manual
You may purchase the kit from electronic online store.

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