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Last Updated on:  06/19/2009 03:09:26 PM

Computer Controlled 100ma Current Source   (July 11, 2008)
designed by David A. Johnson, P.E.

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 Schematic below to view PDF version of this Circuit

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