How do you Build a Magnet Detector

Cindy · 2006-01-18T04:51:34+00:00

I'm looking for a circuit that can detect a magnet passing through afield about 1 foot away from the detector. The magnets are the smallpowerful type as found in harddrives. We need to detect if a personis carrying a magnet in his or her pocket or purse.Is this possible?Thanks,Cindy