Car Head Lights Turn Off Circuit

Car Head Lights Turn Off Circuit
  
This circuit when setup in a car automatically turns off the head light after a preset
time after the ignition switch is turned off.So you can walk out easily from the dark
garage in the light of your car.
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 circuit on a good quality PCB or common board.
Fit the potentiometer on somewhere on the dashboard so that  you can easily set the timing.

Read more: http://www.circuitstoday.com/automatic-head-lights-turn-off-
circuit#ixzz1PHTywkkF
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