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Technically a metal detector is a sensitive circuit to the variations of the magnetic field of a coil when a metal object comes within your area. If we are able to identify these alterations of the magnetic field and process them to a component output, for example through a sound on a handset or a needle on a meter movement, we can locate where the object is located even if it is not in sight.
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There are several methods to “detect” these magnetic variations, the most used are the balance of induction (IB) and the swing by frequency (BFO). The IB are perhaps more sensitive and less suitable to carry out as a personal project, since they need to install two coils sensing head gently adjusted.
Therefore, I am going to propose the construction of a metal detector BFO for their simplicity, not only on the concept of performance but also its setting. Do not believe that being a circuit easier is therefore less efficient, because the BFO can detect a single coin 20 euro cents to 10 cm deep under the sand. For a beach, that depth is not only sufficient, but even higher than necessary, because most of the metallic objects which are lost year after year on the crowded beaches around the world, are slightly overlapping under the sand, rarely more than 1 or 2 cm deep. Of course, if the object is more voluminous, sensitivity distance between the sensor head and the object increases significantly.
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What is a metal detector? In the category Metal Detectors more articles and learn more information about What is a metal detector? Reviews Price Specifications Features Image manuals videos Accessories All this in metal detectors for gold.
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