me_guitarist
Full Member level 6
Hey Guys,
I heard a guy told that we could use hand phone charger & battery on a EXIT sign.
The idea is 10~15 LEDs, the charger charge the Lithium polymer battery if voltage dropped, circuit cut off charging hwhen its full. Battery start working when AC is out. The circuit use LM317 to operate. Any comments on this idea?
I heard a guy told that we could use hand phone charger & battery on a EXIT sign.
The idea is 10~15 LEDs, the charger charge the Lithium polymer battery if voltage dropped, circuit cut off charging hwhen its full. Battery start working when AC is out. The circuit use LM317 to operate. Any comments on this idea?