People wanting to build a high-performance detector from scratch.
George Overton and Carl Moreland were two pioneers in the metal detecting industry who recognized the need for more advanced and reliable technology. Overton, an engineer by trade, began experimenting with metal detectors in the 1970s. He developed a new type of detector that used a balanced coil system, which significantly reduced interference and improved target accuracy. Moreland, a fellow innovator, joined forces with Overton to refine the design and create some of the most iconic metal detectors of the era.
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Clear explanations of magnetics, eddy currents, and how metallic targets respond to magnetic fields.
Before Overton and Moreland published this work, information on advanced metal detector design was scattered across outdated 1970s magazine articles, confusing patent applications, or closely guarded corporate vaults. Inside The Metal Detector democratized this pocket of physics and electrical engineering.
For hobbyists, engineers, and serious treasure hunters, understanding the machinery beneath the surface is just as thrilling as the hunt itself. Among the literature dedicated to this science, one text stands as the definitive authority: . People wanting to build a high-performance detector from
For those interested in exploring the foundational concepts of electromagnetic detection, the title is available via Amazon or Goodreads .
Also known as continuous-wave detectors, TR systems use two separate coils: a transmitter coil and a receiver coil. When no metal is present, the receiver coil is balanced to null out the transmitter's signal. When metal enters the field, it distorts the balance, creating a signal that the control box can process. 3. Very Low Frequency (VLF)
The search coil (or loop) is the most critical part of any detector, yet it is notoriously difficult to design correctly. The book demystifies coil winding, shielding techniques (such as using graphite or aluminum foil to block electrostatic interference), and inductive balancing. Signal Processing Demystified He developed a new type of detector that
High frequencies travel only on the surface of a metal target, while low frequencies penetrate deeper. The book discusses choosing the optimal operating frequency (typically 3 kHz to 20 kHz for VLF). DIY Coil Construction: The Hardest Part
Many electronics enthusiasts and students search for the PDF version of Inside The Metal Detector to use as a digital workbench reference. The book contains highly detailed circuit diagrams, PCB layouts, and component lists that are easier to zoom in on and analyze via a digital screen. Key Highlights of the Text:
is the founder of Geotech, the internet's premier repository for technical metal detector design and schematics.