Computer Controlled 100ma Current
Source (July 8, 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
computerís 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.