我PGA281放大1倍的情况下短路输入（14、15脚），输出（8、9脚）输出0.002V。在放大128倍时输出1.28V，其中9脚3.177V，8脚1.744.且不稳定。EF始终为低电平。如图已将R5，R17去除。
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