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 The coils are adjusted so that there is no signal in the receive coil when there is no metal nearby. Beat frequency oscillator detector - a coil is used as an inductor in an oscillator , whose frequency changes when metal causes its inductance to change. Another oscillator produces a close frequency, and audible beats between them signal metal.
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Metal Detectors are used by treasure hunters to locate metallic items http://www.metal-detectors.info/
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The official Web-Site of Deeptech metal detectors andaccessories A complete illustrated web-site of the firm Deeptech specialised in development of PI detectors, treasuredetectors, weapons detectors, magnetometers, round search coils, square coils with or without magnetometers and others. Our newest unit - Vatus Specialized in heavy mineralization and high trash working! Rogowski This article explains and shows you how to make a fast mono coil for a pulse induction (PI) metal detector. The word “fast” refers to the ability of the coil to operate at low sampling delays.
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