Hi

    Has anyone had any experience in the design of a u-processor based 2-wire,
    4-20mA transmitter?

    How is the electronics supply kept separate from the 4-20mA measurement
signal?
    How is the 4-20mA kept stable as the electronics supply current varies?

    Are there specific 4-20mA add-on chips you can buy that sort out the above
    problems for you?

    Any info. greatly appreciated.

Daz