The Theory Behind Metal Detectors

There are hundreds of Metal Detectors that are available on the market and they usually come in expensive prices. 

As an Electronic Hobbyist, it might come across your mind on building this type of project and perhaps sell them for a cheap price on those Treasure Seekers. 

If you are going to look through the theory behind building a Metal Detector then you will be surprised on the simplicity of its circuitry.

The primary object that makes the Metal Detector works and to locate buried objects is the antenna, plate or the scanner. 

This part composes of coils winded around in circular direction. There is a computation on the required number of turns and diameter for the loop depending on the type of circuit design that you wish to build.


This type of equipment works by generating a powerful magnetic field around the loop or antenna. The magnetic field will travel its way down through the ground until a metallic object will be hit. 

If it does then the magnetic field will travel or bounce back into the antenna where the circuit will process the signal either in a form of sound or light indicating that there is a buried item under the ground.

Metal Detectors that are personally built are called "Home-Made" but does it works or performs well enough like those commercial products?

According to the latest news that I've read, there is this one guy who cannot afford to buy his own electronic detector thus he decided to build himself since the cost is a lot cheaper. 

After he had successfully completed his own project, he tested it on his backyard and to his surprise, he found a chest containing hundred pieces of gold coins. 

The treasure was buried by a depth of around 12 to 24 inches.

So does home-made type of detector as good as the commercial products?

The answer is no because Commercial-Made Metal Detectors can detect deeper buried items and those that have sophisticated adjustments can even distinguish the target object's shape and type whether it's Gold, Metal, Aluminum and etc...


Moreover, according to some professional treasure hunters, no matter how powerful or weak are your tools for searching the success of being able to find valuable items can only be acquired through experience.

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