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12V Lead Acid Battery Charger(Homemade)

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Published on Apr 24, 2011

I took a MOT and carefully stripped out the 2000V Secondary and replaced it with a low voltage high current winding of 18-20T or 12ga wire. New fully rectified DC output is 15.8VDC. An electrolytic capacitor of 1500uf was also added for smoothing purposes(Not much smoothing is required for charging lead acid batteries). Also includes a voltage monitoring circuit which allows you to know when the voltage of the battery being charged has reached completion. A green LED will be brightly illuminated to let you know to unplug the charger.


Schematic Here:

http://tinypic.com/m/k0oy94/4

The circuit in the schematic above will connect to this automatic charging cut-off circuit, then to the battery to be charged:

http://www.youtube.com/watch?v=c_XkuK...

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