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LM317 12V Pb Battery Trickle Charger with Temperature Compensation

A trickle (float) charger is often used to maintain emergency lead-acid batteries.
If those batteries are subject to a wide outside temperature range, such as used in large backup generators, it becomes desirable to adjust the float voltage for...
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Author
crutschow
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Nice simple circuit. I will replace my Harbor Freight trickle charger, which actually drained my battery twice, with this circuit. Will only keep the wall-wart, which supplies the correct voltage, about 20V DC.
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