Posted on Mar 10, 2013

This circuit holds on the internal light for approximately one minute after the car doors are closed. When the door contacts open, a + VE pulse is applied to the base of Tl. This transistor turns on, turning off T2 and charging the 10-llF capacitor. T3 turns on, holding on the internal light.

Click here to download the full size of the above Circuit.

The capacitor takes one minute to discharge when the circuit reverts to its original state.

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