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LM334Z,我现想要它提供一个1.5mA的电流,按照手册上面写的是0.134V/134欧姆得出1mA,那是不是0.134V/89欧姆 就得出了1.5mA

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LM334Z,我现想要它提供一个1.5mA的电流,按照手册上面写的是0.134V/134欧姆得出1mA,那是不是0.134V/89欧姆 就得出了1.5mA,可我现按照手册上面的图画的,将R1变为90欧姆,将R2变为900欧了,可出来的电流才0.8mA的样子,这是什么原因了,急……