4 to 20 mA Current Loop Controller using DAC0832

Discussion in 'General Electronics Chat' started by otomatis, Dec 17, 2010.

  1. otomatis

    Thread Starter New Member

    Jan 4, 2010
    Hi all,
    Does somebody have tried to build 4-20mA converter using IC DAC0832 (datasheet on page 20)...?
    I have been build it but its not working. I was test the input data by SPST toggle switches to ground but the output always 18.9mA (single supply 12vdc 500ma) although switch has changed (0...255).
    I could not find the 92PE37B transistor in my country so i changed to 2sc4408.
    Could somebody help me, why is it not working...?

  2. happyganl

    Active Member

    Dec 17, 2009
    I have been built one with AD421,one point of this device need to keep its ground "float "