walid Posted March 30, 2012 Report Share Posted March 30, 2012 I've built this emergency lighting circuit When the main voltage 230 V is present, LEDs turn off And when does not LEDs turn on Transistor and 1n4148 diode are responsible for making the LEDs turn off Question: How do the 1n4148 diode makes the transistor on and off? Thanksnote: the burnt R = 5.6kWhen I implemented the circuit it worked very well Quote Link to comment Share on other sites More sharing options...
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