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LM358失调现象

Other Parts Discussed in Thread: LM358

用lm358做差分运算放大电路,同向输入端和反向输入端电压一样,当时输出端却输出负压值!理论上说该输出值应该为0或者几毫伏的,但是输出负40毫伏,真是不懂!相同的电路在单独的一块板子上调是没问题的,但是一旦放到整体电路板上调怎么也调不出来…………求各位高手指点指点……!