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我用LM6172做了一个电压跟随器,用Tina仿真是成功的,但是在搭出实际电路后不能正常工作。而且我用万用表测量输出端电压时,当表笔一接触输出端就会使得供电直流源的输出电压改变。从原来的+5V和-5V变为+6.1V和-4.8V。请问这个问题该怎么解决?