Depth metal detectors are capable of detecting objects in the soil at a great distance. Modern modifications in stores are quite expensive. However, in this case, you can try to make a metal detector yourself. To this end, it is first recommended that you familiarize yourself with the design of the standard modification.
Modification scheme
Assembling a metal detector with your own hands (the diagram is shown below), you need to remember that the main elements of the device are a damper on the microcontroller, a capacitor and a handle with a holder. The control unit in the devices consists of a set of resistors. Some modifications are made on drive modulators that operate at a frequency of 35 Hz. Directly racks are made with narrow and wide plate-shaped plates.
Assembly instructions for a simple model
DIY assembly of a metal detector is quite simple. First of all, it is recommended to prepare the tube and attach a handle to it. To install the control unit, high conductivity resistors are required. The operating frequency of the device depends on many factors. If we consider modifications to diode capacitors, then they have high sensitivity.
The operating frequency of such metal detectors is about 30 Hz. The maximum detection distance of an object is 25 mm. Modifications are able to work on lithium batteries. Microcontrollers for assembly will be required with a polar filter. Many models are based on open sensors. It is also worth noting that experts do not recommend the use of high-sensitivity filters. They greatly reduce the detection accuracy of metal objects.
Model series "Pirate"
Making a Pirate metal detector with your own hands is possible only on the basis of a wired controller. However, first of all, a microprocessor is procured for assembly. To connect it you will need a blowtorch. Many experts recommend the use of grid capacitors with a capacity of 5 pF. Their conductivity should be maintained at 45 microns. After installing the capacitors, you can begin to solder the control unit. The stand must be strong and support the weight of the plate. For 4V models, plates with a diameter of more than 5.5 cm are not recommended. System indicators do not have to be installed. After fixing the unit, it remains only to install the batteries.
Using reflex transistors
Making a metal detector with reflex transistors with your own hands is quite simple. First of all, experts recommend installing the microcontroller. The capacitors in this case are suitable for the three-channel type, and their conductivity should not exceed 55 microns. At a voltage of 5 V, they have a resistance of approximately 35 ohms. Resistors in modifications are mainly used for contact type. They have a negative polarity and cope well with electromagnetic waves. It is also worth noting that lithium batteries are allowed during assembly . The maximum width of the plate for this modification is 5.5 cm.
Model with convection transistors: expert reviews
Do-it-yourself metal detector assembly is possible only on the basis of a collector controller. In this case, capacitors are used at 30 microns. If you believe the reviews of experts, it is better not to use powerful resistors. In this case, the maximum capacitance of the elements should be 40 pF. After installing the controller, it is worth doing the control unit.
These metal detectors receive good reviews for reliable protection against wave interference. For this purpose, two diode type filters are used. Modifications with display systems are very rare among home-made modifications. It is also worth noting that power supplies must operate at low voltage. Thus, the battery will last a long time.
Using Chromatic Resistors
How to make a metal detector with your own hands? To assemble a model with chromatic resistors is quite simple, but keep in mind that capacitors for modifications are allowed to be used only on fuses. Experts also point to the incompatibility of resistors with pass filters. Before starting assembly, it is important to immediately prepare a tube for the model, which will be a handle. Then the block is installed. It is more advisable to select modifications to 4 microns that operate at a frequency of 50 Hz. They have a low sieving coefficient and high measurement accuracy. It is also worth noting that searchers of this class will be able to successfully work in conditions of high humidity.
Model with a pulse zener diode: assembly, reviews
Devices with pulsed zener diodes are highly conductive. If you believe the reviews of experts, then home-made modifications are able to work with objects of different sizes. If we talk about the parameters, then the accuracy of detection in them is approximately 89%. To begin assembling the device is from the workpiece rack. Then the handle for the model is mounted.
The next step is to install the control unit. Then the controller is mounted, which is powered by lithium batteries. After installing the unit, you can solder the capacitors. Their negative resistance should not exceed 45 ohms. Expert reviews indicate that modifications of this type can be made without filters. However, it is worth considering that the model will have serious problems with wave interference. In this case, the capacitor will suffer. As a result, the battery for models of this type is quickly discharged.
Using a low frequency transceiver
Low-frequency transceivers in models significantly reduce the accuracy of the devices. However, it is worth noting that modifications of this type are able to successfully work with small items. Moreover, they have a small self-discharge parameter. In order to assemble the modification with your own hands, it is recommended to use a wired controller. The transmitter is most often used on diodes. Thus, the conductivity is provided at around 45 microns at a sensitivity of 3 mV.
Some experts recommend installing strainers that increase the security of models. To increase the conductivity, only transitional type modules are used. The main disadvantages of such devices is the burnout of the controller. With such a breakdown, it is problematic to repair the metal detector with your own hands.
Using a high frequency transceiver
On high-frequency transceivers, assembling a simple metal detector with your own hands is possible only on the basis of a transition controller. Before starting the installation, a stand under the plate is standardly prepared. The average conductivity of the controller is 40 microns. Many experts do not use contact filters when assembling. They have high heat loss, and they are ways to operate at a frequency of 50 Hz. It is also worth noting that lithium batteries are used to assemble the metal detector, which recharge the control unit. Directly, the sensor for modifications is installed through a capacitor, in which the capacitance should not exceed 4 pF.
Model with a longitudinal resonator
Devices with longitudinal resonators are often found on the market. They stand out among their competitors with high accuracy in identifying objects, and at the same time they can work with high humidity. In order to assemble the model yourself, the rack is prepared, and the plate should be used with a diameter of at least 300 mm.
It is also worth noting that to assemble the device you will need a contact controller and one expander. Filters are used only on a mesh lining. Many experts recommend installing diode capacitors that operate at a voltage of 14 V. First of all, they discharge the battery a little. It is also worth noting that they have good conductivity compared to field analogues.
Using Selective Filters
Making such a deep metal detector with your own hands is not easy. The main problem is that a conventional capacitor cannot be installed in the device. It is also worth noting that the plate for modification is selected from 25 cm in size. In some cases, the racks are installed with an expander. Many experts advise starting the assembly with the installation of a control unit. He must work at a frequency of not more than 50 Hz. In this case, the conductivity depends on the controller that is used in the equipment.
Quite often, it is picked up with a lining to increase the security of the modification. However, such models often overheat, and are not able to work with high accuracy. To solve this problem, it is recommended to use conventional adapters, which are installed under the capacitor blocks. Do-it-yourself coil for a metal detector is made from a transceiver unit.
Contactor application
Contactors in devices are installed together with control units. Racks for modifications are used for short lengths, and plates are selected for 20 and 30 cm. Some experts say that the devices should be assembled on pulse adapters. In this case, capacitors can use low capacitance.
It is also worth noting that after installing the control unit, it is worth soldering the filter, which is capable of operating at a voltage of 15 V. In this case, the model will maintain a conductivity of 13 microns. Transceivers are most often used on adapters. Before turning on the detector on the contactor, the level of negative resistance is checked. The indicated parameter averages 45 ohms.