Using phone charger and battery for a LED sign

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me_guitarist

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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?
 

Re: LED Sign

Why do you need the LM317?
 

LED Sign

Not say need LM317, just I heard a friend told this idea
 

Re: LED Sign

What type of comments are you looking for? Are you seeking help with this design?
 

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