ETA9740 single-cell lithium battery power board, 5V 3.3V ADJ boost three-way output
R8 is the charging current limiting resistor, 75K is recommended, and the current limit is about 2.7A; the terminal is a 2060 type terminal and needs to be used with a pin-type insulated cold-pressed segment or bare wire tin plating; the resistance of the feedback part of the boost circuit needs to be adjusted by yourself.
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