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照着datasheet里面撘了一个电路，设定Rf为300放大10倍结果无论怎样都只放大2倍左右，另外改了Rf为900欧一样没有改变只有两倍，SD管脚我是悬空的。
不知道输入什么信号, 有个可能: 这 300 欧姆太小, 输出驱动不了
输入是什么信号，信号源内阻，Rin是多少呢
