abt4s Posted June 7, 2006 Report Share Posted June 7, 2006 HI ALL,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) .THANK YOU,abt4s Quote Link to comment Share on other sites More sharing options...
MP Posted June 9, 2006 Report Share Posted June 9, 2006 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.MP Quote Link to comment Share on other sites More sharing options...
abt4s Posted June 9, 2006 Author Report Share Posted June 9, 2006 HI MP,I did it by OP_AMP . Is there any IC that it can do all of this by own?Thank you, Quote Link to comment Share on other sites More sharing options...
MP Posted June 9, 2006 Report Share Posted June 9, 2006 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.MP Quote Link to comment Share on other sites More sharing options...
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