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Company Logo TE Connectivity

  • Headlight Timer Circuit

  • Created: Aug 19, 2015

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This design is a simple timer circuit that keeps the car’s headlights on for a certain time. It turns on for 1.5 minutes; however, the time may vary which depends on the value of capacitor and resistors used. The device uses the TE connectivity’s pushbutton switch, a capacitor, resistors and transistors that are widely available in the market. The switch used is a high-performance type designed to withstand extreme shock, vibration, temperature and altitude.

The circuit works when the pushbutton switch is pressed, the capacitor C1 is charged to the full battery voltage. As a result, the transistors Q1 and Q2 are turned ON that drives the relay K1 to energize the headlights. The relay will remain activated until the capacitor is fully discharged. The time delay of the circuit depends on values of capacitor and resistor which in the circuit is set to 1.5 minutes.

The timer circuit has various applications which may be used for lighting systems, headlight control, robotics, and other automotive applications. This device reliably manages the headlights to automatically turn ON at a certain period as desired by the user.



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