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一个不规范的运放应用,如何确定输入输出的函数关系

如果假定,输入- 和输入+,电压相等,那么输出vo就是 vi的76倍。

但是实际测试的数据是,

有人知道这个,原理图的输入和输出的函数关系么?万望赐教