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The original Overton manuscript (circa 1998) was typewritten, with hand-drawn schematics. Carl Moreland’s first revision (early 2000s) cleaned it up but was still based on analog parts like the LM308, NE5534, and 2N3904 transistors. The community has since scattered "updates" across forum threads—new coil balancing methods, differential PI mods, and microcontroller integration.
"Inside the Metal Detector" (ITMD) by George Overton and Carl Moreland, a definitive technical guide for detector electronics, has been significantly updated with a third edition released in December 2024. Expanded to over 600 pages, the new edition introduces all-new DIY projects and updated theoretical content focusing on modern digital techniques and pulse induction methods. For more details on the updated third edition, visit Amazon . Inside The Metal Detector: Overton, George, Moreland, Carl
The book systematically breaks down how a detector differentiates between varied target responses, phase shifts, and magnetic ground mineralization. Deep Dive Into Detector Topologies
Inside the Metal Detector by George Overton and Carl Moreland is a technical guide that focuses on the engineering and electronic principles behind metal detector design. Unlike standard hobbyist manuals, it provides schematics, experiments, and project builds for various detector types. Amazon.com Key Features & Content Operating Principles To help you get the most out of
No official "version 2.0" PDF has been released by Geotech or Moreland in the last decade. However, community-maintained versions occasionally appear on geotech1.com forums, sometimes labeled "Overton_Moreland_2019_upd.pdf" or similar. These are fan updates, not canonical.
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| Feature | 2nd Edition | 3rd Edition (2024) | | :--- | :--- | :--- | | | ~250 pages | 634 pages | | Content | Significant | A major re-write, over 250% more material | | Projects | Complete projects included | "Teaching circuits" but project details on forums | | Support | Book | Forums for BOMs, PCBs & updates | | Format | Paperback | Paperback & Hardback | | Electronic | Yes (Kindle) | No (print only to combat piracy) |
The authority of Inside the Metal Detector stems directly from the real-world expertise of its authors: "Inside the Metal Detector" (ITMD) by George Overton
VLF is the most common technology used in modern coin and jewelry hunting.
The book thoroughly analyzes the three primary types of metal detectors. Understanding these architectures is essential for anyone looking to build or modify their own machine. 1. Very Low Frequency (VLF) / Induction Balance
inches, boasting over 600 pages—a huge increase in content from the previous 6x9, 2nd edition format.
Inside the Metal Detector by George Overton and Carl Moreland is widely considered the definitive technical blueprint for understanding, designing, and building electronic metal detection circuits. Rather than acting as a standard "how-to" guide for finding treasure, this highly technical handbook cracks open the literal internal physics, schematics, and engineering principles behind modern locating technology. Inside The Metal Detector: Overton, George, Moreland, Carl
The book dedicates individual chapters to specific circuit design methodologies, moving from historic, basic principles to highly advanced multi-frequency architectures: 1. Beat Frequency Oscillator (BFO)
: Effective metal detecting requires more than just a good detector. It involves understanding your environment, using the right search techniques, and knowing how to interpret signals.
For decades, the metal detecting community has included an eclectic mix of hobbyists, treasure hunters, and serious engineers. Yet, for all the passion and practical knowledge available in online forums, there was a significant gap in the literature for decades — a lack of a comprehensive, technical resource that truly explains how these devices work. This is where the book , by George Overton and Carl Moreland, stepped in to fill a crucial void.
Modifications and improvements on existing PI platforms. Conclusion
