Metal Detectors
by Gavin Cheeseman
Part 1 supposedly covers a number of metal detection techniques but it focuses mainly on the BFO type. Magnetometers get some coverage, IB is barely mentioned, and PI not at all. Part 2 covers the construction of a fairly simple BFO detector.

This project was published in the May & June, 1999 issues of Electronics and Beyond, a British electronics magazine owned by Maplin Electronics PLC. I would like to thank Maplin Electronics for giving me permission to post this online version.

Metal Detectors - Part 1 (PDF-181K)
Metal Detectors - Part 2 (PDF-328K)