![](http://u.dianyuan.com/bbs/u/64/717621207545750.jpg?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20)
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以上电路在5V/电池BT+上只加+5V电压,不接电池时,LED灯不亮
当在5V/电池BT+上只加+5V电压,同时将1颗锂电池的+极接到此端,锂电池的-极接到下面的电池BT-上时,LED灯亮了?
那位高手知道图中的ZC20是哪个芯片?同时此电路的原理能否讲解下!
谢谢~~!