How to make a metal detector yourself?

A metal detector is usually associated with treasure hunters, who carefully analyze each piece of soil. They look through the magnetic field, which creates the device, deep under the ground. In addition to finding treasures, such a device can be used as an assistant when you lose your car keys on a picnic or any other metal object. How to make a metal detector with good sensitivity, which will react even to the smallest metal product? In any case, such a device can be useful to you on a trip, and perhaps, it will really help to find a treasure.

There are many articles written about how to make a metal detector. Let's dwell on the most reliable and time-tested scheme that begins to work right after its implementation. For any metal detector it is necessary to create a magnetic field, which will test a small area. The radius of this area depends on the sensitivity of the device and the strength of the magnetic field. Since we collect a simple device, the radius will be small.

As a source of magnetic field, we can use a working calculator or any other household appliance. Surely you paid attention to the characteristic interference when receiving radio broadcasts, for example, when a mobile phone is operating? Correctly, the receiver in our scheme will be an ordinary radio tuner tuned to the frequency of the working calculator.

Customize it is simple enough, install next to the included calculator and radio. Now switch it to the AM range and find the wave on which the characteristic crackle will be heard. Turn the calculator off and on to make sure that you have found the interference the working calculator creates. The setup is finished, now you know how to make a metal detector. It is possible to start practical testing of the device.

Bring a metal object to the device. Once it enters the magnetic field created by the operating calculator, the sound in the radio will change. By approaching and removing metal, you will be able to determine the radius of action of such a device. Usually it does not exceed thirty centimeters. This is quite enough to find the lost object.

Perhaps over time, you will want to learn how to make a metal detector more sensitive. To implement this idea, you will need a set of radio components and Skills in the manufacture of radio circuits. A homemade metal detector on microcircuits works according to the above principle, only the magnetic field created by the emitter is much more powerful. This directly affects the range of the device.

As you can see, metal detectors with their own hands to collect quite realistically, most importantly, to know the principle by which it works. Increasing the power of the radiator and tuning the receiver to its frequency - these are the main tasks that stand in the manufacture of a device of higher power and better sensitivity. It should also be taken into account that if the circuit of the metal detector is complicated, special devices may be needed to adjust it.