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4-20ma signal output based on 12 hour clock

Discussion in 'General Electronics Discussion' started by Bandit DFW, Jul 29, 2017.

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  1. Bandit DFW

    Bandit DFW

    Jul 29, 2017
    I am trying to come up with a circuit that will give out a 4-20 ma signal based on time. The output would be 4ma 12:01 with a linear progression to 12ma at 6:00 and 20ma at 12:00. Has anyone seen a circuit that would do this?
  2. kellys_eye


    Jun 25, 2010
    Given the 4-20mA interface usually requires some form of input signal - and that can be 'any' type of signal - it's surely only a means of scaling the input accordingly?

    A stepped ramp with 720 steps (call it 1024 but resetting at 720) could be built feeding an R2R ladder and used as the input perhaps?
  3. dorke


    Jun 20, 2015
    Welcome to EP.

    A uController with a 24 hour timer and a D/A could do the trick.
    It will be an all software project.
    There may be a need to convert the output voltage to current,
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