A highlight of the work is its inclusion of working example designs and experiments, allowing readers to build their own equipment: . GEB-discriminators . Microprocessor-controlled PI detectors . Editions and Availability
A detailed exploration of how the transmitter coil produces a magnetic field and how that field induces eddy currents in metal objects.
"Inside the Metal Detector" by George Overton and Carl Moreland is regarded as a definitive technical guide, offering in-depth explanations of BFO, VLF, and Pulse Induction technologies. Published by Geotech Press, the book covers practical design projects for electronics enthusiasts. For more details, visit Amazon . Inside The Metal Detector: Overton, George, Moreland, Carl A highlight of the work is its inclusion
The book begins by establishing the physical foundations of electromagnetism that dictate how a metal detector interacts with subterranean environments. Rather than treating the ground as an inert medium, Overton and Moreland detail the challenging physics of .
The text details methods to neutralize ground mineralization (like iron-rich clay or salt water) by shifting the phase demodulation angle, ensuring the detector ignores ground matrix signals. 2. Pulse Induction (PI) Editions and Availability A detailed exploration of how
Symmetrical detection pattern; highly accurate pinpointing capabilities. Poor performance in heavily mineralized or high-iron soils.
The book's work is inseparable from its publishing platform and online community: . Founded and administered by Carl Moreland (with George Overton as a key moderator), the website at Geotech1.com is arguably the single largest and most important collection of metal detector information anywhere. It features a large discussion forum covering everything from basic questions to advanced circuit design. Critically, all the designs presented in the "Inside the Metal Detector" books are open-source and freely available on the Geotech website, including the Gerber files needed to manufacture printed circuit boards. This commitment to open sharing has made Geotech the primary hub for detectorists and engineers worldwide to learn, share, and collaborate. For more details, visit Amazon
Continuously transmits a low-frequency sine wave to read phase shifts. Coin shooting, relic hunting, general beach hunting.
Following the success of the first edition, the book evolved significantly. A second, heavily revised edition was published, and in 2024, the updated third edition was released. This latest version represents a major rewrite, containing over 250% more material than its predecessor, with all-new example designs and an expanded focus on modern, advanced techniques.
The core value of Inside the Metal Detector lies in its breakdown of specific circuit topologies. The authors guide the reader chronologically through the evolution of detection logic, offering working schematics for each type. Operating Principle Ideal Use Case Pros & Cons (Beat Frequency Oscillator)
: All designs presented are open-source and freely available via the authors' Geotech forum, which includes source code, CAD, and Gerber files. Target Audience and Readability