Circuit diagram :
Car Head Lights Turn Off Circuit Diagram
When the ignition switched on first the voltage from battery is fed to the relay through diode D1.When the ignition switch is turned off it produces a negative going pulse at the pin 2 that triggers the timer. The output of the IC goes high for the time set by R1 .This makes the transistor Q1 to conduct to energize the relay to drive the headlight.After the set time the light goes off.With the value of components used you can make a setting from 10 S to 60 S.
Notes :
- Assemble the schema on a good quality PCB or common board.
- Fit the potentiometer on somewhere on the dashboard so that you can easily set the timing.
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