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Schematic to build a 4ma-20ma supply

Discussion in 'Electronic Projects Design/Ideas/Reviews' started by rperch, Jan 17, 2009.

  1. KanLok

    KanLok New Member

    Joined:
    Mar 24, 2012
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    Thanks Reloadron,

    Yes, please send across your own drawing as programmable controller is not easy to find out here.

    Regards,
    KanLok
     
  2. Reloadron

    Reloadron Well-Known Member Most Helpful Member

    Joined:
    Dec 23, 2009
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    Location:
    Cleveland, Ohio USA
    The attached will provide from just below 4 mA to about 22 mA. It is simple and quick. I used a 2N2222 but any of several NPN simple transistors would work as well as any single supply basic op amp. The pot in the attached is set to about 50% of range. When possible I like to use a 10 turn pot. This should work as a quick simple temporary solution.

    Ron
     

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