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Instrument amp circuit

Discussion in 'General Electronics Discussion' started by Tickhogan, May 8, 2013.

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  1. Tickhogan

    Tickhogan

    3
    0
    May 8, 2013
    Hi,

    I have a dpm342 4-20mA loop powered LCD readout, and I want it to read a 36k variable resistor with a 5v supply over its entire range. I know I have to use a op amp, but not sure which one, or the circuit I need. Can anyone help me?

    In summary, I need a circuit to convert a signal of (541.61uV - 3.97V) to a current of (4mA to 20mA).

    Cheers
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    11,522
    2,654
    Nov 17, 2011
    Have a look at this part.
    It is a complete voltage to current converrter with a 4-20mA output
     
  3. Tickhogan

    Tickhogan

    3
    0
    May 8, 2013
    Thanks Harald, looks Like is exactly what I am looking for. I will try to track one down. Is there a generic chip number if I am unable to get the ti part?
     
  4. Harald Kapp

    Harald Kapp Moderator Moderator

    11,522
    2,654
    Nov 17, 2011
    I'm afraid no.
     
  5. Tickhogan

    Tickhogan

    3
    0
    May 8, 2013
    Thanks Harald,

    I have ordered the TXR111 as it was a lot cheaper, and looked like it would do the job. Thanks for putting me onto it.

    Cheers,
    Hoges
     
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