"Inside the Metal Detector" by George Overton and Carl Moreland is a comprehensive technical guide covering the physics, circuit design, and construction of metal detection technologies. The heavily revised 3rd edition offers extensive updates on digital signal processing and multi-frequency techniques, making it a key resource for those building their own equipment. For more details, visit Amazon.
The Original & 2nd Edition: Focused heavily on classic analog circuits, providing hands-on experiments and projects for major categories like BFO (Beat Frequency Oscillator) and TR (Transmit-Receive).
Detailed technical look at coil types, construction techniques, and performance comparisons. Amazon.com Edition Differences 2nd Edition (ITMD-2): "Inside the Metal Detector" by George Overton and
: Those wanting to build their own detectors or understand complex schematics. Serious Detectorists
Uses high-voltage pulses to detect targets; particularly effective in highly mineralized ground or saltwater. Off-Resonance & PLL: George Overton is a respected designer and experimenter
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George held a small, weathered gold sovereign over the coil. He moved it slowly. Usually, the machine would groan, confused by the proximity of the steel workbench. But this time, the speaker remained silent until the coin passed the center. Then, a pure, crystalline note rang out—a sound so sharp it felt like a physical light being turned on in the room. "It works," George breathed. Uses high-voltage pulses to detect targets
Coil Design: Information on coil types, construction techniques, and performance comparisons—often a "black art" in the industry.