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你好，电路如上图所示，3脚未接信号时，3脚电压为0，1脚电压=2脚电压=-13.4V，14脚电压为3.54V；3脚接信号时，运放输出一切正常。请问这是为什么？
亲；因为放大器输入阻抗很高，开路直接导致被干扰甚至有损坏的危险。因此建议一脚对地接一高值电阻；一切就正常了。
