Metal detector is an electronic device for searching and distinguishing metals, objects from metal, which can be hidden at different depths under a layer of sand, earth, in walls of premises and various constructions.
The basic diagrams of detectors, executed on transistors, microcircuits and microcontrollers are given. Metal Detector factory production is quite expensive device, so self-made homemade detector can save a lot of money.
Schemes of modern detectors can be built on different principles of work, list the most popular ones:
Beating method (measurement of change of the reference frequency);
Induction balance at low frequencies;
Induction balance on coils;
Pulse method.
Many novice radio amateurs and diggers Wonder: How to make a metal detector? It is desirable to start the acquaintance with Assembly of simple scheme of the metal detector, it will allow to understand work of such device, to get the first skills in search of treasures and products from multicolored metals.
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