This circuit will operate a car`s headlights for a predetermined time to light up the driveway or path after the driver has left the car. SQl is pushed and Q2 is turned on closing the relay and turning on the car`s headlights. Cl begins to charge through VR1 until Q1 turns on, turning Q2 off
The relay will then open switching off both the lights and the unit. The delay is governed by the time taken for the capacitor to charge, which is about one minute.