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Hi
输入上的电阻有压降,建议将R31/R32改为0欧姆或者磁珠。20欧姆的电阻即便电流只有0.3A, 输入的压降就是6V.
其次负电压的U26, 需要在-12V与输入之间增加电容(可就用这个100uF)