Programmable Current Sink
Motivation Recently, I began a project to build a (reasonably) accurate 3-axis magnetometer. One of the challenges in building a magnetometer is calibrating it with a known magnetic field. Creating a known magnetic field requires using a calibration coil with a known current flowing through it. If you want to make multiple (and consistent) measurements, it is very convenient to have the current under computer control…and that is where the Programmable Current Sink (PCS) got its’ start.