put 4 ~ 20MA into the positive and negative 10 V current-voltage conversion circuit

Published:2011/5/11 21:53:00 Author:Fiona | Keyword: current-voltage conversion | From:SeekIC

Circuit Work The purpose of using OP amplifier A1 is to consider that if the one end of sensor resistance R1 can not be grounded, R1 can be used as a differential amplifier. However, if the resistance R6 and R7 of the summation meter have high value,you can remove A1. In order to make A3 output -10V when the current is 4MA, the A1 should be made output in -2 ~-10V. OP amplifier A2 is the summing amplifier putting unipolar input into bipolar output. In order to output 0 when the current is 12MA, add the polar opposite +6 V for subtraction. VR3 is used to determine the slope. Because it should enlarge 8V which is input to 20V, so the magnification should be A = 20 / 8 = 2.5 times.



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