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I have a device that The voltage of input is 0 (v) till 12.5 (v) & current output is 4-20 ma.
So I need a schematic of resistor to voltage convertor so that in spite of 0 (ohm) it has 0 (v) & in spite of 900 (ohm) , it has 12.5 (v) .



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I must not be understanding what you want because it sounds too easy. Why not an op-amp with your variable 0 to 900 ohms in the feedback loop to give you 0 to 12.5V?
If this is not it, maybe you should show what you already have and explain what you want to be different. A drawing works really well.


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If you mean to convert the current on your present system to a voltage, the simplest way to do so is to drop the current across a load resistor and measure the voltage.
If you mean is there an easier way to get a 0 to 12.5V output from a 0 to 900 ohms resistance, I am not aware of anything simpler than using an op-amp.


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