: Most chapters include functional example designs with source code, CAD, and Gerber files made available through the Geotech forum
A significant portion of the book is dedicated to VLF technology, the industry standard for coin shooting and prospecting.
The book serves as a comprehensive guide for those interested in the design and construction of metal detectors. It moves beyond high-level overviews to explain the fundamental physics and electronic circuitry required for various detection methods. : Most chapters include functional example designs with
Inside the Metal Detector by George Overton and Carl Moreland is a comprehensive technical guide covering the physics, electronics, and design principles of metal detection technology. It provides in-depth analysis on detector topologies like VLF and PI, while offering practical, open-source projects for builders. For more details, visit Inside the Metal Detector: Moreland, Carl - Amazon.com
: In-depth analysis of Pulse Induction (PI), Beat Frequency Oscillation (BFO), Transmitter-Receiver (TR), and Very Low Frequency (VLF) systems. Inside the Metal Detector by George Overton and
Whether you are an engineer, a DIY enthusiast looking to build your own unit, or a detectorist aiming to master the intricacies of discrimination and ground balance, this book provides the foundational knowledge needed. 1. The Core Principles: An Electromagnetic Journey
PI systems, often used for deep seeking or beach hunting, send out powerful, short bursts of current through a coil, creating an intense magnetic field. The book explains how to interpret the rapid decay of this field to detect metal, even in highly mineralized saltwater or black sand environments. Very Low Frequency (VLF) Whether you are an engineer, a DIY enthusiast
Inside a standard Overton design, the transmitter is a MOSFET (often an IRF740 or IRF840) switched by a 555 timer or a microcontroller PIC. The coil (100-500µH) is charged with 5 to 10 amps for a very short duration (100 microseconds).