The smell of wanderings, the aroma of adventure or the prosaic disposal of your summer cottage from various metal debris may suggest the purchase of a special device. Professional metal detectors, reviews of which are known to everyone, are quite expensive. But they meet all the requirements of these professional diggers. You need to choose the best metal detectors. Reviews will help to understand this difficult matter. And you can make this device yourself.
Where are metal detectors used?
In addition to the search for real treasures and surveys of private land for the purpose of cleansing the soil, metal detectors are used in various fields:
- to detect underground communications of cables and pipelines;
- for assistance in archaeological excavations;
- in civil engineering and forensics;
- in sapper troops.
Sports treasure hunting
One of the types of active hobby - sports treasure hunting - is becoming increasingly popular among enterprising and enthusiastic people. What is interesting in this matter?
- The element of suspense is always fascinating. How to make a metal detector at home? What lies beneath the surface of the earth? Until you get it and try it, you don’t know.
- Whose apparatus will “look” deeper under the ground? Whose will better determine the quality of a metal bauble that has lain for many years in obscurity?
- And if this piece of iron also has value - this is the limit of glee of the inventor, who independently figured out how to make a metal detector at home from improvised means.
- At rallies and competitions, of course, coins are dug specifically to determine the capabilities of home-made and factory detectors.
What is the principle of metal detectors based on?
Any metal detectors operate on the basis of the principles of the Foucault currents known in the school curriculum. We will not go into the details of the experiments. When the search coil and a metal object come closer together, a frequency change occurs in the generator, which the device reports with a sound signal. If there is a beep in the headphones, then something metallic is lying underground.
Modern inventors work on two tasks:
- increase in search depth;
- improvement of identification parameters of devices;
- reduction in energy costs;
- convenient operational characteristics.
What do you need to stock up for the manufacture of the detector?
How to make a metal detector at home? It’s worth a bit to get acquainted with electronics and read physics for the 7th grade of high school. Experience with some tools and available tools will be useful. It is necessary to study and test a certain number of electrical circuits in order to choose from them the one that will really work. Materials that will be needed when working:
- small generator (from an old tape recorder);
- quartz resonator ;
- film capacitors and resistors;
- vinyl or wooden ring for search coil;
- plastic, bamboo or wooden cane - holder;
- aluminium foil;
- wires for coil winding;
- piezoelectric emitter;
- metal box - screen;
- headphones for receiving an audio signal from the device;
- two identical transformer coils;
- 2 batteries "Krona";
- perseverance and patience.
Search metal detector assembly sequence
A search coil is made from a plywood circle with a diameter of 15 cm: a wire is wound around the template in coils (15-20). The stripped ends are soldered to the connecting cable. A layer of thread is wound around the perimeter of the coil over the wire to secure it.
All parts of the circuit are soldered on a PCB printed circuit board in the following order: capacitors, resistor system, crystal filter, signal amplifier, transistor, diodes, search generator. A soldered board is placed in the prepared case, connected to the search coil and mounted on a stick-holder.
The signal from the search coil, reflected by a metal object, increases the frequency of the generator. Amplified by a quartz filter, it is converted by an amplitude detector into a constant pulse, which produces sound.
How to dig up asphalt and go on an unbeaten path?
Not all those who ask how to make a metal detector at home think about the fact that the earth is an electrical conductor. However, it is this fact that can greatly affect the search performance. Metal detectors "AKA", in which the creators mathematically calculated and minimized the influence of the electromagnetic field of the Earth, process the entire flow of waves. In addition, the signal reflected from the object is sent to the monitor of the device. The device shows a certain image by which you can determine what kind of piece of iron lies under a layer of soil:
- or is it a bunch of coins;
- maybe this is an ancient nail;
- a mine or a high-explosive fragment;
- helmet or sapper shoulder ;
- single metal item.
A smart detector reports the depth of the subject. The patented technology of averaged visualization of search objects allows you to decide whether to dig in this place. The device has a convenient design and is easily prepared for use.
The inventors most keen on treasure hunting love to do everything on their own. Some even complicate the process and come up with how to make a simple metal detector at home. And it does not matter that he can only find the old button at a depth of 5-6 cm from the surface. But how much pride the creator receives from the process itself!
Have all the treasures already been dug up?
Ancient manuscripts and maps with legendary treasures carry not only treasure-seekers eager for treasures. Historians, researchers and archaeologists have been searching for years for what Napoleon had taken from Moscow. And the riches stolen by Stenka Razin? Where do they lie, who are they waiting for? Have you really found pirate pantries on the islands of the Caribbean?
It is known from some sources that Ataman mining is quietly waiting for the lucky ones on one of the islands of the Caspian Sea. And it turns out that the gold exported by Napoleon was recaptured and hidden by the Cossacks. And drove the French to Paris. And only one returned, and even then he could not find out the area. And while he was waiting for winter, he fell ill and died. Since that time, a leaf with a plan has remained in one of the archives, on which are marked the designations of all the chests and ten barrels of gold.
Russia is not Europe, and in the old days there were no banks. Wherever they could, they hid wealth from spiteful critics and robbers. So, even if not such a big find, but a smaller one, it’s still nice. How to make a metal detector at home? If you really want to, you just need to try.
As a favorite character said in one famous film, we’ll look!