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12v输入电源，经过tps7a4701稳压，然后过LT1054转为负电压，最后给运放供电。
HI
芯片不会啸叫，看看有没有电容电阻破碎之类（这个会有啸叫现象）？
其次你可以逐级确认，例如单独测试tps7a4701，或者LT1054， 外部供电，然后带外部负载。
