Whether you're a seasoned engineer, a hobbyist building your first metal detector in a garage, or a detectorist who simply wants to understand why their machine behaves a certain way in the field, the work of George Overton and Carl Moreland has set a new standard. Their collaborative book "Inside the Metal Detector" and the Geotech online platform represent a complete ecosystem of technical knowledge, open-source projects, and community support that remains unmatched in the world of metal detecting.
The foundational principles detailed in the book are heavily discussed and expanded upon across the web. The Geotech Community Hub
: Detailed explanations of induction, eddy currents, and magnetism. Whether you're a seasoned engineer, a hobbyist building
Fundamental coverage of induction, eddy currents, and how different targets (conductive vs. magnetic) respond to fields.
Projects for GEB-discriminators and VLF-discrimination circuits. The Geotech Community Hub : Detailed explanations of
The text explores modern digital and hybrid techniques used to maximize performance in challenging conditions. 3. Practical Applications: Projects and Experiments
Whether you are looking to build your own PI machine or just want to understand how your VLF detector discriminates between a coin and a piece of iron, this book is the go-to reference in the industry. with patents in advanced detection technologies
Covers ground balance, motion filtering, and discrimination methods.
: Most chapters include functional example designs with source code, CAD, and Gerber files made available through the Geotech forum
Carl Moreland brings a wealth of professional engineering experience to the partnership. He served as an Engineering Manager at White's Electronics, a major industry brand, and continues his career at First Texas (the parent company of Fisher, Teknetics, and Bounty Hunter). His expertise in high-performance designs is also evident in his open-source work, most notably the "Hammerhead" Pulse Induction metal detector. This design, intended as a learning platform, is an excellent example of his clear, educational circuit design. The Hammerhead project is characterized by its modular approach and flexibility, allowing experimenters to adjust critical parameters like transmit pulse rate, pulse width, and sample delays. Moreland is also an inventor, with patents in advanced detection technologies, including hybrid systems and multi-frequency platforms.