DIY underwater metal detector: description, tools, assembly

02.09.2019 DIY, House
DIY underwater metal detector: description, tools, assembly

The real hams are not those citizens who want to save their money on the purchase of new equipment, but those who really want to bring all the existing parameters of a particular unit to the maximum performance . This statement applies to those who plan to make their own underwater metal detector. This option is only relevant if the master has the necessary skills. The result of the manipulations will depend on how well the quality materials were prepared in advance.


It is not only easy to build an underwater metal detector with your own hands, but also financially profitable. Using the finished device, you can find various objects at the bottom of a river, sea or lake. The unit functions perfectly even in conditions of poor visibility and loud noise. Experts highlight the following features of the metal detector:

  1. The product compares favorably with the classic unit by the length of time spent under water. Some experts prefer to go up to the throat with a metal detector, because of which it is necessary to take into account the optimal immersion depth of the device. It is necessary to foresee all the nuances.
  2. To make a high-quality underwater metal detector with your own hands, you need to configure the product to search for non-ferrous metals.
  3. Accurate recognition of tiny objects: rings, earrings, chains. It is these products that are the main prey of underwater searchers.

These three criteria must be taken into account by the master during the assembly of equipment.

Professional version

The main nuances

To make your own underwater metal detector, you need to prepare PETV wire 0 thick in advance 5 mm. The master should get 25 turns. You can experiment with wire and coil shape. For a classic product, you need 25 meters of PETV. To build a control unit and a rod, you need to use a tube made of stainless steel or plastic. This requirement must be observed, as other materials under water will be negatively affected by corrosion. If the master builds a stainless steel and plastic structure, the finished product will favorably differ from all analogues in a long service life. The main frame should not be too light, otherwise it will constantly pop up. To make a self-made underwater metal detector reliable and comfortable in use, it must cope with the negative effects of salt sea water.

Necessary tools

You can make an underwater metal detector with your own hands in just a few hours, if you follow all the recommendations of specialists. A universal assembly can be made if you prepare the following tools:

  • electrical tape;
  • soldering iron and solder;
  • printed circuit board;
  • a sharp knife and scissors;
  • PETV wires with 0.5 mm parameters;
  • basic set of electronic components;
  • silicone sealant.
    Underwater metal detector

Detailed instructions

It’s not so difficult to build an underwater metal detector yourself, the main thing - start by preparing the circuit board. After that, all the necessary electronic elements are carefully installed on it. Details are best soldered. The wizard will have to connect a power source. It should be a powerful rechargeable battery, not a regular battery. The prepared board with the power supply is installed in a sealed container. If necessary, you need to bring LED bulbs to the surface. All joints must be treated with silicone sealant. The capacity is fixed to a pre-assembled rod. It is necessary to qualitatively wind the search coil. For these purposes, a 3-liter jar is ideal. The case must be plastic. The coiled wire is carefully poured with silicone sealant. It remains only to solder the conclusions from the coil to the stranded wire.

Maximum tightness

Experts recommend filling all available cracks with silicone sealant. For the control unit and the coil, classic polypropylene pipes of suitable diameter can be used. Build a high-quality rod from an old fishing rod and reliable adapters. For the box of the power supply, you can safely use the tube from the sealant. At the final stage, the master will have to install waterproof ports for the connectors. Due to this, it will be possible to connect underwater headphones for the metal detector.

With your own hands you can build many interesting and high-quality products. You just need to follow the classic pattern. With the finished metal detector, you can dive to great depths. The unit must necessarily have salt compensation, as well as a comfortable indication. The use of classic display in this industry is unjustified. It is best to make the device as an amphibian or underwater detectors. Thanks to this, it will be possible to recognize valuable metal products on the ground and under the water column.



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