: Many designs and associated code are maintained by the authors through the Geotech Forums , which hosts a massive collection of technical metal detecting resources.
George Overton, known by his avatar "Qiaozhi" (a transliteration of "George" in Mandarin), is an administrator on the forum. Their book extends the open-source, collaborative spirit of Geotech into a structured, permanent form. All of the designs, schematics, and Gerber files for the PCBs (Printed Circuit Boards) featured in the book are freely available on the website. : Many designs and associated code are maintained
The book dives into the operating principles and electronics that make a detector function, covering topics like magnetics, induction, and eddy currents. All of the designs, schematics, and Gerber files
The authors are renowned admins of the Geotech Forums , which serves as the largest online open-source repository for DIY metal detector schematics, Gerber files, and source code. Readers frequently seek digital PDF references to cross-reference circuit board layouts, component lists, and software code line-by-line while sitting at their electronics workbenches. Practical DIY Projects Included explaining the theory behind metal detectors
Metal detectors are often associated with treasure-hunting beaches and relic-seeking hobbyists. But when you press a coil to the earth and listen for that telltale tone, you’re also tracing a line between memory, labor, and the hidden acoustic lives of everyday metal. In the work of George Overton and Carl Moreland—artists, documentarians, or practitioners (their precise roles slide between maker and chronicler)—that line becomes a narrative instrument: a way of composing stories out of signals, histories, and the lived textures of place.
: Multifrequency, digital, and hybrid techniques. Practical Build Projects
: The book starts with the fundamentals, explaining the theory behind metal detectors, including how they detect metal, the types of detectors available (e.g., Very Low Frequency (VLF), Pulse Induction (PI)), and the differences between them. This foundational knowledge is crucial for both beginners and seasoned detectorists looking to upgrade or understand their machines better.