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me_guitarist
Joined: 03 Oct 2006
Posts: 136
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 22 Jun 2008 13:13 LED Sign |
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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?
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me_guitarist
Joined: 03 Oct 2006
Posts: 136
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| 24 Jun 2008 11:38 LED Sign |
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| Nobody wanna comments?
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mahaju
Joined: 17 Mar 2007
Posts: 31
Helped: 2
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| 24 Jun 2008 12:04 Re: LED Sign |
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| Why do you need the LM317?
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me_guitarist
Joined: 03 Oct 2006
Posts: 136
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| 24 Jun 2008 17:31 LED Sign |
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| Not say need LM317, just I heard a friend told this idea
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davidgrm
Joined: 08 Apr 2006
Posts: 159
Helped: 10
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| 26 Jun 2008 12:33 Re: LED Sign |
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| What type of comments are you looking for? Are you seeking help with this design?
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