大家好 我是电路小白 最近要做一个音频的采集电路 由于声音的频率是20-20kHz 模拟输入的电压也采取这个段，幅值为2mv 运放采取 OPA1662 电源为+15V和-15V 如下图所示
可是 输出端的电压却非常小 照理说应该有5倍的增益
可实际结果是100pV 求各位大神解答
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