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Old 11-26-2008, 09:10 PM #1
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Default need help with LM317 battery charger!!!!!!

i am trying to build a 12v battery charger with the LM317 regulator. i found the schematic in the product documentation from the mfg. the only thing is, is that i need it to cut off when it reaches full charge. i am using a solar cell for V source (12VDC) and the battery is 12VDC 7AH. the device it is powering is 12VDC with 500mA draw. any ideas would greatly help!!


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Old 11-28-2008, 05:21 AM #2
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Default Re: need help with LM317 battery charger!!!!!!

Quote:
Originally Posted by WonHungLo
i am trying to build a 12v battery charger with the LM317 regulator. i found the schematic in the product documentation from the mfg. the only thing is, is that i need it to cut off when it reaches full charge. i am using a solar cell for V source (12VDC) and the battery is 12VDC 7AH. the device it is powering is 12VDC with 500mA draw. any ideas would greatly help!!
can u draw a circuit diagram of what you have? i've been using some LM317T regulator for my senior design project, pretty neat lil thing.

check this out
http://ourworld.compuserve.com/homep...den/page12.htm

lots of good info on the LM317, the circuit they have might help you with the turn off voltage, i'm not sure though.

-Kendall
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