The sensitivity of such a metal detector increases with increasing intensity of the field. Better put together a scheme of the device so that the transistor was in a metal case, one side of which was open. With the issue of choice of the metal detector are facing both experienced hunters and newcomers. Everyone wants to avoid buying fakes, or device that does not match the declared characteristics. Today, the market is represented by a huge number of detectors, which are very easy to get confused.
You can create simpler versions with home appliances. Metal detectors with metal detector, in this instructional video, you'll see how to create a metal detector of only two household items, and under twenty dollars. So, if you chase the treasure, and don't have the money yet, then make your metal detector. There have been advanced applications that allow you to use your own magnetic field phone to detect metal objects.Professional metal detectors are simple but require a bit of work to make. But you can build a reduced portable detector using a calculator, AM/FM radio. While building a conventional metal detector may require several, you can create simpler versions with home appliances.