万能充电器

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这是万能充输出电路,整流输出约9V由Q2调整输出4.2V充电电压.在充电状态LED3不发光,IC内1脚输出负电平,Q2导通,

输出电压是由R9R10决定还是R15R17呢?我调整它们未能调好输出电压