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.

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

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