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Simplest DIY Li-Polymer Charger Schematic

2015-03-16 22:22  
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Simplest DIY Li-Polymer Charger Schematic
This is a Lithium-ion charger for lipo batteries. Circuit schematic shows configuration for charging single 3.7V lipo battery but voltage can be set to charge several batteries in series. Lipo charger sets a current limit with the LM317, and 1 resistor, and the voltage limit with the TL431, and 2 resistors.