上电后没有声音,偶尔是“塔塔”的声音,尝试断开输入和断开输出喇叭,并去掉输出的磁珠和到地电容,用示波器观察1和2相连的地方波形如下。图形是断开输入和输入时的。
PCB图有铺铜到地的,为了方面截图去掉了铺铜。
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