The story of "Inside the Metal Detector" is a unique one, born from a fortunate coincidence. Before becoming co-authors, George Overton and Carl Moreland were both independently working on separate books about metal detector technology. Overton, an administrator on the popular Geotech forum (known as "Qiaozhi"), had explored Beat Frequency Oscillator (BFO), Transmit-Receive (TR), and Very Low Frequency (VLF) designs. Moreland, an Engineering Manager at White's Electronics and founder of the Geotech1.com website, was primarily focused on Pulse Induction (PI) technology. When they discovered each other's parallel projects, they realized their expertise was remarkably complementary, with very little overlap. The decision to merge their efforts was the catalyst for what would become a definitive text.
For hobbyists, engineers, and DIY electronics builders, tracking down a digital copy or an updated revised edition—often searched online via strings like "inside the metal detector george overton carl morelandpdf upd" —represents the ultimate pursuit of specialized hardware knowledge. The Authors: Core Experts of the Geotech Community
: When this field encounters a conductive metal object, it induces tiny, swirling electrical loops called eddy currents within the target. The story of "Inside the Metal Detector" is
A digital oscilloscope is incredibly helpful when tuning the phase-demodulation circuits described by Overton and Moreland.
Overton and Moreland categorize and explain the primary methods used in modern detection: Moreland, an Engineering Manager at White's Electronics and
Documentation for projects, PCBs, and Bill of Materials (BOMs) is now conveniently located on the Geotech Support Forum, allowing for updates to designs without waiting for a new book printing. Why You Need "Inside the Metal Detector"
Small hand-held probes used to isolate targets inside a dug hole. and DIY electronics builders
The First In-depth Book on Metal Detector Technology Since 1927
Whether you are a DIY enthusiast looking to build your own coil or a seasoned professional trying to understand the nuances of target ID, the work of Overton and Moreland remains essential. It is a testament to the engineering prowess that drove the golden age of metal detecting manufacturing, preserved in a digital format that continues to educate the curious.
For those looking to build or modify hardware, the book includes complete project designs: Amazon.com Practical Builds: