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One-component Metal Detector

The principle behind a metal detector is really quite simple. The proof: this article, which demonstrates that a detector may be built in a jiffy from just one active component and easily accessible auxiliary items. The design shown here is quite sensitive: depending on tuning, metal coins may be detected at a distance of 80-90 cms. As opposed to many other designs, the circuit shown here is relatively stable in respect of tuning and therefore easy to use.
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