Mr George Overton

George Overton is an administrator on Carl Moreland's popular Geotech forum at www.geotech1.com/forums where his avatar is known as Qiaozhi (which is a transliteration of "George" in Mandarin).

Geotech has the single largest collection of metal detector information anywhere, with a large discussion forum on a variety of technical topics.

All the designs presented are open-source and freely available on the Geotech website, including source code, CAD, and Gerber files.