George Overton is a British electronics enthusiast known for his practical, no-nonsense explanations of metal detector circuits. He contributed to the UK Detector Net and other forums, often demystifying phase discrimination and ground balancing. Carl Moreland, on the other hand, is an American engineer who ran the Geotech website, a repository of metal detector schematics, modifications, and technical discussions. Together, their collaboration—likely a compiled PDF from forum posts or a shared document—represents a transatlantic effort to make detector electronics accessible to the average hobbyist.

The book Inside the Metal Detector by George Overton and Carl Moreland is the definitive technical guide for understanding, designing, and building metal detector circuits. It is primarily aimed at DIY enthusiasts, hobbyists, and electronics engineers interested in the internal workings of detecting technology. Book Overview

Purpose: Unlike user manuals, this book focuses on the operating principles and electronics behind detection.

Key Topics: Covers induction, eddy currents, coil design, and specific technologies including BFO (Beat Frequency Oscillator), TR (Transmit-Receive), VLF (Very Low Frequency), and PI (Pulse Induction).

Practical Projects: Includes schematics and experiments for building items like an off-resonance pinpointer and microprocessor-controlled detectors. Editions:

2nd Edition: Often found as a ~280-page reference focused on classic analog designs.

3rd Edition: A significant expansion (over 600 pages) with all-new projects and re-written material. Core Technical Content

The book details several metal detector topologies and advanced techniques:

VLF Discrimination: How ground balance and motion filtering work in modern detectors.

Pulse Induction (PI): Covers ground balance methods and advanced PI techniques.

Design & Components: Explains coil types, performance comparisons, and construction techniques.

Open Source: Many designs and resources associated with the authors are available on the Geotech Forum, including CAD and Gerber files. Availability and Formats

While some documentation sites like VDOC.PUB may list entries for a PDF, it is primarily available through retailers: Inside The Metal Detector - Amazon.com

Book overview * Book overview. Inside the Metal Detector offers hard-to-find information on the technology behind metal detectors. Amazon.com

The First In-depth Book on Metal Detector Technology Since 1927

"Inside the Metal Detector" by George Overton and Carl Moreland is a comprehensive technical guide covering the theory, design, and construction of VLF and Pulse Induction detectors. The text is highly regarded by hobbyists for including practical, buildable schematics, though it requires an intermediate to advanced understanding of electronics. For more details, visit Amazon. Inside The Metal Detector by George Overton (2015-05-10)

This book is widely considered the "bible" for understanding the technical theory behind metal detection technology. Rather than a standard user manual, it is an engineering textbook that explains how machines distinguish between different types of metals and ground minerals.

Here is an informative guide summarizing the key concepts, history, and technical theories found within their work.


One of the most valuable sections of the Overton-Moreland work is the deep dive into Discrimination.

Carl Moreland (often online as "Carl" or "Geotech") is a modern legend. An electrical engineer by training, Moreland took Overton’s foundational work and did three critical things:

Thus, when people search for a "George Overton Carl Moreland PDF," they are actually looking for the Geotech edition of Overton’s book, often bundled with Moreland’s design notes.

Example request write-up:

“Hello, I am looking for a full PDF copy of ‘Inside the Metal Detector’ by George Overton and Carl Moreland. This document is often referenced in metal detecting electronics circles, possibly from Geotech or similar hobbyist sites. Does anyone have a clean, complete version they could share or point me to? Thank you.”


The PDF’s title names two people who—depending on which corner of the internet you ask—are portrayed very differently:

Because these names rarely appear in mainstream publications, their personas in the PDF became malleable: to some readers they’re credible documentarians; to others they’re characters in a cautionary tale about how hobbyist enthusiasm can morph into myth-making.

PEDIR INFORMAÇÕES/
MARCAR CONSULTA
VER DISPONBILIDADE
HORÁRIA