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电压转4-20ma电路

Other Parts Discussed in Thread: TL082, LM358A, OPA2277, LM358

这个电路的电压转电流如果使用LM358A可以正常工作,如果使用OP2277与TL082的时候不能输出低于7ma电流。请教一个跟那个参数有关,如何调整?