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Computer Controlled 100ma Current Source   (July 11, 2008)

Often in industrial control systems a constant current source is needed, which is controlled by a computer and referenced to circuit ground. The circuit below converts a zero to 5v signal from a computer’s analog output into a current, with a full scale of 100ma. The circuit shown requires a 9v DC supply but any voltage from 9v to 12v will work.

Click on Drawing Below to view PDF version of Schematic

Circuit 100ma Current Source designed by David Johnson, P.E.

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