If your interest in making a detector doesn't go so far as to weld plates, you can choose the easy way. All you need is a radio and a calculator. The basis of the simplest metal detector will be a thick cardboard book cover. A calculator is installed on one of its internal parts, and a radio on the other.
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You can fix them with double-sided tape. The AM radio receiver is set to a broadcast-free station and the volume is raised to the maximum. Turn on the calculator - noise will be heard from the radio speaker. The book is folded until the noise is reduced, and it is better to disappear completely.
The antenna will not receive pulses. In this position, you need to fix the book using a spacer and an elastic band. The search for metal is carried out as follows: the book is brought to the area to be examined and they begin to slowly move it. Once you hear sound from the radio speaker, you can guess what was found.
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