Metal detector detection frequency. Comparative analysis of coils of different types and diameters. Perfectly fits these parameters

Various models of metal detectors use one or more operating frequencies when searching. This is due to their scope of application and engineering solutions. The range of frequencies used in modern devices is from 1 kHz to 30 MHz.

The operating frequency of a metal detector is directly related to the size of objects and metal discrimination. This is explained by the physics of propagation of electromagnetic waves. At the same time, the operating frequency of metal detectors determines their discrimination capabilities...

When using low frequencies, the detection depth of objects increases, but sensitivity to small targets near the ground surface decreases. Regarding the target metal type, a low detector frequency increases the detector's sensitivity to silver and copper, but decreases it to gold and nickel.

When using high frequencies, the opposite happens. The detection depth of objects is reduced, and sensitivity to small targets near the ground surface, gold and nickel increases.

There are four operating frequency ranges for universal and specialized metal detectors:

1. VLF(Very Low Frequency) 3 to 30 kHz
2. LF(Low Frequency) 30 to 300 kHz
3. M.F.(Medium Frequency) from 300 kHz to 3 MHz
4. HF(High Frequency) from 3 to 30 MHz

What frequency should you choose a metal detector? At what frequency to look for gold?

There are also multi-frequency or ones that operate simultaneously on several frequencies (4 frequencies, 17, 28 and more). This allows you to solve search problems at various levels simultaneously, for example, searching for large objects at low frequencies and searching for small colored targets (coins, rings) at higher frequencies.

Related tags: metal detector frequency, operating frequency range, optimal metal detector frequency, metal detector frequency detection depth, metal detector operating frequency, vlf, Very Low Frequency

Which can easily be assembled in one day. It had a fairly high sensitivity, but was not without its drawbacks.

One of the disadvantages is false positives when searching for metals in unfavorable conditions.

Therefore, today we offer you a metal detector circuit with a reduced operating frequency. It's a little more complicated, but still pretty simple.

The metal detector is a reliable device, the electronic circuit of which provides good sensitivity and stable operation.

A distinctive feature of such a device is its low operating frequency. The metal detector's inductors operate at a frequency of 3 kHz. This ensures, on the one hand, a weak response to unwanted signals (for example, signals arising from the presence of wet sand, small pieces of metal, etc.), and on the other hand, good sensitivity when searching for hidden water pipes and central heating routes, coins and other metal objects.

Implementing and setting up a circuit requires appropriate skill and experience, so a novice amateur designer should first turn to simpler circuits and devices.

The block diagram of the metal detector is shown in Fig.
The metal detector generator excites oscillations in the transmitting coil at a frequency of about 3 kHz, creating an alternating magnetic field in it.

The receiving coil is located perpendicular to the transmitting coil in such a way that the magnetic lines of force passing through it will create a small EMF. At the output of the receiving coil, the signal is either absent or very small.

A metal object entering the field of the coil changes the inductance value, and an electrical signal appears at the output, which is then amplified, rectified and filtered.

Thus, at the output of the system we have a constant voltage signal, the value of which increases slightly as the coil approaches the metal object. This signal is supplied to one of the inputs of the comparison circuit, where it is compared with the reference voltage that is applied to its second input.

The reference voltage level is adjusted in such a way that even a small increase in the signal voltage leads to a change in state at the output of the comparison circuit. This in turn activates an electronic switch, causing an audible signal to be sent to the output amplifier stages, alerting the operator to the presence of a metal object.

The electrical circuit diagram of the metal detector is shown in Fig. 2.

A transmitter, consisting of transistor VT1 and associated elements, excites oscillations in coil L1. The signals entering the L2 coil are then amplified by the D1 chip and rectified by the D2 chip, connected according to the amplitude detector circuit.

The signal from the detector goes to capacitor C9 and is smoothed by a low-pass filter, which consists of resistors R14, R15 and capacitors C10 and C11. The signal is then fed to the input of the comparison circuit D3, where it is compared with the reference voltage set by variable resistors RP3 and RP4.

Variable resistor RP4 provides quick and coarse adjustments, while RP3 provides fine adjustment of the reference voltage.

The generator, assembled on a transistor with one transition VT2, operates in continuous mode, but the signal produced by it arrives at the base of transistor VT4 only when transistor VT3 closes, since, being in the open state, this transistor shunts the output of the generator.

When a signal arrives at the input of microcircuit D3, the voltage at its output decreases, transistor VT3 closes and the signal from transistor VT2 through transistor VT4 and the volume control RP5 goes to the output stage and loudspeaker.

The circuit uses two power supplies, eliminating the possibility of any feedback from the circuit's output to its sensitive input. The main circuit is powered by a battery with a voltage of 18 V, which is reduced to a stable voltage of 12 V using the D4 chip. In this case, a decrease in battery voltage during operation of the circuit does not change the setting.

The output stages are powered by a separate 9 V power supply.

The power requirements are quite low, so three rechargeable batteries can be used to power the device. The output stage battery does not require a special switch, since the output stage consumes no current in the absence of a signal.

A metal detector is still a rather complex device (despite what we said at the very beginning), so the circuit assembly should be carried out in cascades with a thorough check of each cascade.

The circuit is mounted on a board on which there are 24 copper strips of 50 holes each with a pitch of 2.5 mm. First of all, 64 cuts are made in the strips and three installation holes are drilled. Then, on the back of the board, 20 jumpers are installed, pins for external connections, as well as two pins for capacitor C5.

Then install capacitors C16, C17 and chip D4. These elements form a 12 V power supply.

This stage is checked by temporarily connecting a battery with a voltage of 18 V. In this case, the voltage on capacitor C16 should be 12 ±0.5 V. After this, the elements of the output stage are installed: resistors R23-R26, capacitors C14 and C15 and transistors VT4-VT6.

Attention: the housing of the VT6 transistor is connected to its collector, so contact of the housing with adjacent elements and jumpers is unacceptable.

Since the output stage does not consume current in the absence of a signal, it is checked by temporarily connecting a loudspeaker, a variable resistor RP5 and a 9 V battery. Then resistors R20-R22 and transistor VT2 are installed, forming an audio signal generator.

When two power sources are connected, a sound background is heard in the speaker, changing with the position of the volume control knob.

After this, resistors R16-R19, capacitor C12, transistor VT3 and chip D3 are mounted on the board.

The operation of the comparison circuit is checked as follows.

Variable resistors RP3 and RP4 are connected to the measuring input D3. This input is formed using two 10 kOhm resistors, one of which is connected to the positive +12 V supply rail, and the other to the zero rail. The second terminals of the resistors are connected to pin 2 of the D3 chip. The jumper from this pin serves as a temporary connection point.

With rough tuning (both batteries are included), which is carried out by variable resistor RP4, the sound signal is interrupted at a certain position, while with fine tuning with variable resistor RP3 the signal should change smoothly near this position.

The low operating frequency of the metal detector reduces the sensitivity for small targets, but allows you to search at greater depths.

If these conditions are met, begin installing resistors R6-R15, capacitors C6-C11, diode VD3 and microcircuits D1 and D2. Having turned on the power source, first check the presence of a signal at the output of the D1 chip (pin 6). It should not exceed half the power supply value (approximately 6 V).

The voltage across capacitor C9 should not differ from the output voltage of this microcircuit, although interference from the AC mains may cause a slight increase in this voltage. Touching the input of the microcircuit (the base of capacitor C6) with your finger causes an increase in voltage due to an increase in noise level.

If the tuning controls are in a position where there is no sound signal, touching capacitor C6 with your finger causes this signal to appear and disappear.

This concludes the preliminary check of the performance of the cascades. The final check and adjustment of the metal detector is carried out after the manufacture of the inductors.

After a preliminary check of the circuit stages, the remaining elements are installed on the board with the exception of capacitor C5. Variable resistor RP2 is temporarily set to the middle position.

The board is secured to the L-shaped aluminum chassis via plastic washers (to eliminate the possibility of short circuits) using three screws. The chassis is secured in the control panel body with two bolts holding two clamps designed to secure the control panel body to the finder rod. The side of the chassis secures the power supplies in the chassis.

When assembling the remote control, make sure that the switch terminals on the reverse side of the variable resistor RP5 do not touch the board elements. After drilling a rectangular hole, the speaker is glued.

The rod and connecting parts that form the finder head holder are made of plastic tubes with a diameter of 19 mm. The finder head itself is a plate with a diameter of 25 cm, made of durable plastic, such as plexiglass. Its internal part is thoroughly cleaned with sandpaper, which ensures good adhesion to the epoxy resin. The main characteristics of a metal detector largely depend on the coils used, so their manufacture requires special attention.

Coils of the same shape and size are wound on a D-shaped circuit, which is formed from pins fixed to a suitable piece of board. Each coil consists of 180 turns of 0.27 mm enameled copper wire, tapped at the 90th turn.

Before removing the coils from the pins, they are tied in several places. Each coil is then wrapped with strong thread so that the coils fit tightly together. This completes the production of the transmitting coil.

The receiving coil must be equipped with a screen. The coil is shielded as follows. It is first wrapped with wire and then wrapped in a layer of aluminum foil, which is then wrapped with wire again. This double winding guarantees good contact with the aluminum foil.

There should be a small gap or gap in the wire windings and foil, as shown in the figure, to prevent the formation of a closed turn around the circumference of the coil.

The coils made in this way are secured with clamps along the edges of the plastic plate and connected to the control unit using a four-core shielded cable. Two central taps and the screen of the receiving coil are connected to the neutral bus through shielding wires.

If you turn on the device and the radio receiver located near the coil, you can hear a high-pitched whistle (at the frequency of the metal detector), due to the pickup of the sound signal in the radio receiver. This indicates that the metal detector generator is working properly.

In this case, it does not matter what band the radio is tuned to, so you can use any cassette recorder instead to check it.

The working position of the coils is determined either by the output signal of the metal detector, which should be minimal, or by the readings of a measuring device (voltmeter) connected directly to capacitor C9.

The second option for adjusting the coils is much simpler.

The voltage across the capacitor should be approximately 6 V. After this, the outer parts of the coils are glued with epoxy resin, and the inner ones, passing through the center, are left loose, allowing for final adjustment.

The final adjustment consists of setting the loose parts of the coils in such a position that non-ferrous objects, such as coins, cause a rapid increase in the output signal, and other objects cause a slight decrease.

If the required result is not achieved, it is necessary to swap the ends of one of the coils.

It should be remembered that the final adjustment or adjustment of the coils should be carried out in the absence of metal objects.

Once installed and firmly secured, the coils are coated with a layer of epoxy resin, then fiberglass is placed over them and the whole thing is sealed with epoxy resin.

After manufacturing the finder head, capacitor C5 is built into the circuit, variable resistor RP1 is set to the middle position, and variable resistor RP2 is adjusted to the minimum output signal. In this case, on one side of the middle position, variable resistor RP1 ensures recognition of steel objects, and on the other side - objects made of non-ferrous metal.

It should be borne in mind that each time the nominal value of the resistance of the variable resistor RP1 changes, it is necessary to re-configure the device.

In practice, a metal detector is a lightweight, well-balanced, sensitive device. During the first few minutes after turning on the device, there may be an imbalance of the zero level, but after some time it disappears or becomes insignificant.

Metal detector elements

Resistors:

R1, R6, R7, R8: 100 kOhm
R2, R3, R22, R23: 100 Ohm
R4, R5: 6.8 kOhm
R9, R11, R21, R25: 10 kOhm
R10: 220 kOhm
R14: 15 kOhm
R15, R19: 68 kOhm
R16: 8.2 kOhm
R17: 18 kOhm
R18: 3.9 MOhm
R12, R13: 47 kOhm
R24: 4.7 kOhm
R20: 33 kOhm
R26: 1.8 kOhm

Variable resistors:

RP1, RP4: 10 kOhm (linear)
RP2: 10 kOhm (microminiature, horizontal mounting)
RP3: 100 kOhm (linear)
RP5: 10 kOhm (combined with switch)

Capacitors:

C1: 100 µF, 16 V (electrolytic)
C2, C5, C14: 0.01 µF
C3, C4: 0.22 µF
C6, C13: 0.1 µF
C7, C8, C12: 1 µF
C9: 47 µF, 16 V
C10: 2.2 µF, 35 V
C11: 0.47 µF, 35 V
C15, C16: 220 µF, 16 V (electrolytic)
C17: 470 µF, 25 V (electrolytic)

Transistors:

VT1, VT5: BC214L (KT3107B, KT3107I)
VT2: TIS43 single junction (KT117)
VT3, VT4: BC184L (KT3102D)
VT6: BFY51 (KT630D)

Diodes:

VD1, VD2, VD3: 1N914 (KD521A)

Chips:

D1, D2, D3: CA3140 (K1109UD1)
F4: mA78L12AWC voltage stabilizer +12 V, 100 mA (K142EN1, K142EN2)

If you feel the spirit of adventure in yourself and want to find and dig up a real treasure: a metal detector is a necessary tool for you. To begin an exciting search, you should purchase an impeccable device that will meet the task. First of all, we are interested in coins, gold and military relics. We will hand over devices for searching for wiring and underground communications to housing and communal services workers. The metal detector is not designed to last a couple of seasons. Like any other durable professional tool, its choice should be approached wisely, having first studied the topic.

How does a metal detector work?

The basis of a metal detector is made up of two elements: a coil and a control unit. Using electricity, the coil produces an electromagnetic field that reacts to a metal object. The control unit correctly interprets the signal coming from the coil and is also responsible for controlling and configuring the device. Electricity for the operation of the metal detector comes from rechargeable batteries, AA or Krone batteries.

As soon as a metal object enters the detector's coverage area, the device emits a characteristic sound, thereby notifying the user of the find. The tone can move from a low sound to a higher one, depending on the proximity to the object and its size. The screen also contains all the necessary information, including advanced parameters, such as: precise identification of the object, type of metal and its value, target depth.

What to pay attention to

The depth of metal detection is one of the defining characteristics; it largely depends on the operating frequency of the detector. A low operating frequency (5-7 kHz) is best suited for identifying large objects at great depths, but it will not see small ones closer to the surface of the earth. High frequency (18-100 kHz) is used to search for coins, gold nuggets and other small objects.

A deep metal detector usually uses a concentric (mono) coil type. Another type, Double-D, works at a shallower depth, but with a noticeably larger area; such a coil is effective when working with highly mineralized soil.

An effective metal detector must have a discrimination function. With it, the device will separate trash metals (tin cans, beer caps) from valuable ones, notifying the user only about the latter. The “Pinpoint” operating mode helps determine the exact position of an object in the ground, which simplifies its excavation. Another important setting is ground balance. It allows you to adjust the sensitivity of the detector to find valuable items in highly mineralized soil. Depending on the metal detector model, there are manual and automatic settings, as well as preset parameters.

For easy carrying, the metal detector has a collapsible design. Its weight plays an important role, lighter is better. This directly affects user fatigue, especially during prolonged use. There are completely sealed devices designed for underwater search. Some models are equipped with headphones. They are of a closed type, which allows you to sensitively capture every sound signal from the detector without irritating the people around you. Nothing prevents you from using your own headphones; most likely you will need an adapter to a quarter-inch jack.

How to make a metal detector with your own hands

It is very difficult to make a fully functional and, above all, effective metal detector on your own. This requires sufficient qualifications, experience, tools, necessary parts and plenty of free time. You also cannot do without a working diagram of the metal detector and documentation; you will have to look for them on the Internet.

Don't be surprised, but a smartphone - a truly universal tool - also looks good as a metal detector. This is possible thanks to the built-in sensor, a magnetometer, which we usually, without knowing it, use for navigation as a compass. For work, any smart device on iOS or Android is suitable for us. Just download the application, which can be easily found in the Apple Store and Play Market for the search “metal detector”. You won’t go on an adventure with this, but it will help with finding wiring in the wall and other communications.

A simple metal detector can also be made from readily available materials. We will need an analog (not digital) radio operating in the AM range and any calculator, with or without a speaker. Tune the receiver to the highest frequency (it should not pick up the radio station), we should hear static noise. Next, take a calculator and connect these devices back to each other. Choose a position so that the sound becomes muffled, this may take some time. You may need to place them at different angles relative to each other. If we achieve success, we will secure them with tape. To make sure our homemade metal detector works, test it on any large metal object. You will notice that when you bring the device closer to an object, a characteristic signal will appear. And the closer you get, the louder the sound becomes.

Which metal detector is better to buy?

Don't be confused by the wide variety of models on the market; only a few of them are interesting. Considering how much a metal detector costs, choosing a quality device is a responsible decision.

Even the most advanced high-end metal detector does not guarantee success. The device is simply not a jewelry magnet. Therefore, choosing the right location is a fundamental factor in a successful treasure hunt. Decide what you will be looking for. For example, coins or relics. The first ones are worth a walk in the park or the beach. For the second, it is better to search with a metal detector at previous places where people stayed; old cartography will come in handy here.

To make choosing the right metal detector as easy as possible, we will introduce you only to the best devices in their category. We will help you choose the right device for a specific task.

For beginners

For more than ten years, this metal detector has enjoyed deserved popularity among beginners. It provides the necessary minimum of functions, is simple and reliable. The rod has an S-shaped bend and can be disassembled into 3 parts. The model is easy to use. Weighs 1.2 kg, has a soft armrest. Concentric coil 9", operating at a frequency of 6.5 kHz, suitable for searching for coins, jewelry and military artifacts.

Discrimination is not regulated, there are 3 operating modes: All Metal detects all metals, Jewelry cuts off some junk metals, Coins is suitable for searching for coins. In the latter mode, the detector is able to determine the depth of coins in inches. Ground balancing is automatic. Sensitivity has 4 levels of adjustment. The controls are simple, the screen is not backlit. The device is powered by four AA batteries, which are enough for 40 hours of operation. There is a ¼” jack for connecting headphones.

The initial model in the line of advanced metal detectors from Minelab. It is suitable for beginners and useful for long-time seekers. The design of the rod is S-shaped, collapsible. Weighs 1.3 kg. Equipped with a 9” mono coil with an operating frequency of 7.5 kHz. The model is compatible with branded coils at 7 and 18.75 kHz.

Discrimination can be set manually. In addition to the standard All Metal mode, there are two working templates: the first reacts only to non-ferrous and large ferrous metals, the second completely cuts off all ferrous metals. The detector notifies you of the find with sound and images on the display. Determines the depth of the object. The Pin-point function will help you determine the exact location of the find. Ground balancing is automatic or manual.

Minelab X-Terra 305 has an informative LCD screen without backlight. The controls are simple, you can adjust the volume and frequency of the sound, and the threshold background. Powered by four AA batteries. There is a headphone jack.

This metal detector is distinguished by the presence of an effective 11” Double-D coil. Operating frequency 7.81 kHz, suitable for identifying coins, jewelry, and large ones. The device weighs 1 kg, the rod is collapsible with an armrest.

Teknetics Alpha 2000 does not have much variety in operating modes. Only All Metal with manual discrimination setting. The discrimination scale consists of 8 types of metals. The Notch function allows you to selectively exclude detection of any of them. The detector determines the depth of the detected object in inches. The sensitivity setting has 5 levels. Ten volume levels, the sound can be turned off completely. There are two headphone jacks: 3.5 mm and ¼”. It is powered by one 9 V crown battery. The manufacturer provides a 5-year warranty on the control unit and 1 year on the coil.

A simple and functional metal detector. Equipped with a concentric 8” coil with an operating frequency of 6.7 kHz. With it you can find coins, jewelry and artifacts. The device weighs 1.134 kg, the rod can be disassembled into 2 parts.

Bounty Hunter Discovery 2200 operates in All Metal and Discrimination modes. The latter consistently excludes the detection of waste metals. The Notch function allows you to selectively ignore unwanted metal groups. If the detector reacts to an unwanted metal, press the Zap button, the category of this metal will no longer be determined. Sensitivity has 5 levels of adjustment. The screen displays the depth of the coin and the battery charge. The device operates for 20 hours from two 9 V CZK. There is a ¼” headphone jack.

The modern design of this model allows you to work efficiently and quickly. Thanks to the special design of the rod, the metal detector does not take up much space, folds quickly, and is widely adjustable in height. Length when folded is 55.5 centimeters, when unfolded - 130.5. Weighs 1.06 kilograms. Equipped with a 10" mono coil with a frequency of 7.8 kHz. It is waterproof and can withstand immersion to a depth of 0.6 meters.

Minelab GO-FIND 40 provides the user with decent functionality. It has 3 operating modes: All Metal, ignoring iron, cutting off all junk metals. The detector notifies you of the find with sound and LEDs. The sound volume is adjustable and there is a ¼” headphone input. There is a Pin-Point mode. Sensitivity has 4 levels of adjustment, ground adjustment is automatic. The device is synchronized with a smartphone using Bluetooth, the application is searched in the Play Market and App Store using the request “Go-Find”. Screen with built-in backlight. Powered by four AA batteries.

For professionals

The flagship in the X-Terra line of metal detectors. The detector is equipped with a 10.5” DD coil with a frequency of 7.5 kHz. Supports proprietary coils with low frequency 3 kHz, medium frequency 7.5 kHz and high frequency 18.75 kHz. The device weighs 1.3 kilograms, the rod is adjustable in length from 121 to 142 centimeters.

Minelab X-Terra 705 works in three modes: Coins for coins, Relics for artifacts and Prospecting Mode for searching for small items, even gold. The latter has four programs that ignore hardware to varying degrees. There is a separate key for the All Metal mode. The Pin-Point function will not only suggest the location of the object, but also provide its characteristics: size and shape.

The model is finely tuned to the needs of a specific user. Discrimination has 28 segments. Ground balance manual and automatic, special setting for searching on the beach. The screen is informative with backlight. Powered by four AA batteries.

This model completes the ACE series from Garrett. The top-end device is equipped with headphones with volume control and an 8.5x10” DD coil with an operating frequency of 10 kHz. There is also a protective cover for the coil and a cover for the control unit. The weight of the device is 1.32 kilograms, the rod is adjustable in length from 106 to 129 centimeters.

The metal detector has 5 operating modes: All Metal, Custom, Coins for coins, Jewelry for jewelry, Relics detects bronze, lead and copper. Discrimination can be set manually. There are 8 sensitivity levels, there is a Pin-Point. Ground balancing is automatic.

The Iron Audio function informs the user with sound about the type of detected object. The tone varies depending on the metal, whether it is an iron nail, a copper coin or a gold ring, it will be different. The screen is not backlit, displays the current operating mode, sensitivity, Target ID, depth indicator and battery charge. Four AA batteries will last for 20 hours.

The metal detector uses advanced FBS technology: the coil operates simultaneously at 28 frequencies from 1.5 to 100 kHz. Significantly facilitates the search for small and large objects at any depth. The 11" Double-D reel is waterproof. The weight of the device is 1.8 kilograms, the rod is adjustable in length from 110 to 140 centimeters.

Minelab Safari is efficient and easy to use. There are four operating modes: All Metal, Coins for coins, Jewelry for decorations and Relics for artifacts. The detector allows you to adjust discrimination, sensitivity, sound volume, and threshold tone. Detuning from ground and electrical interference is automatic. Pin-Point informs about the location of the find by sound and image on the screen. Target ID will help determine the value of a detected object.

Screen without backlight. Displays the current operating mode, discrimination parameters, Target ID, finding depth, battery charge. You can connect headphones via a ¼” jack. Minelab Safari is power hungry: it is powered by eight AA batteries, which last for 8 hours.

A metal detector is suitable for searching for small objects: coins and jewelry. The kit includes an 11” DD high frequency coil 13 kHz. The weight of the device is 1.6 kilograms. The bar consists of three sections, adjustable from 113 to 134 centimeters.

Teknetics T2 is extremely easy to use. One button and one adjustment knob are responsible for the settings: sensitivity, sound volume, number of tones, ground balance, discrimination. There are two operating modes: All Metal and discrimination. The discrimination scale and Target ID show what metal is hidden underground. Pin-Point helps you pinpoint the exact location of an object. Ground balancing manual or automatic. The screen displays the discrimination scale, Target ID, and battery charge. Headphones are connected to a ¼” jack. The detector is powered by four AA batteries. Their charge lasts for 35 hours.

A popular model among professionals, the Garrett AT Pro accurately distinguishes non-ferrous metals from unnecessary trash, and is fast and easy to use. Supplied with headphones and an 8.5”x11” DD coil with an operating frequency of 15 kHz. The coil is protected from water. The rod is collapsible, adjustable in length from 106 to 129 centimeters, weight 1.4 kg.

Garrett AT Pro operates in standard or professional mode. Using the second one, the detection depth will increase by a couple of centimeters, but the signals will become more difficult to distinguish; practice will be required. Each of them has three discrimination programs: Custom, Coins and Zero. Discrimination is adjusted on a scale from 1 to 40. The Iron Audio function allows you to distinguish types of metals by sound: an iron nail, a silver coin or a gold earring will have a different tone. Sensitivity has 8 levels of adjustment. Ground balance can be adjusted manually or automatically. There is a Pin-Point.

The model received an information screen, but without backlight. It displays the current operating mode, discrimination scale, digital Target ID, sensitivity, coin depth and battery charge. The device is powered by four AA batteries, the charge lasts for 30 hours.

For children

The model with a shortened rod is suitable for use by children from six years of age and will be an interesting gift for a child. However, the model is successfully used for working in narrow spaces, where there is no room for crowding with a full-size model. The length of the detector is adjustable within 50-85 centimeters and weighs only 350 grams. 6" concentric coil with a frequency of 6.5 kHz.

Bounty Hunter Junior has two control knobs: sensitivity and discrimination. If you do not use discrimination, the All Metal mode works. Ground balancing is automatic. The pointer screen shows the battery status, and if metal is detected, it will determine its type and notify with a sound. Works 20 hours from two 9 V CZK.

A budget device for searching for coins, jewelry and military artifacts. Easy to use and reliable. Weighs 1.35 kilograms, length when unfolded is 134 centimeters. Equipped with an 8” mono coil with a frequency of 6.6 kHz.

The metal detector received a pointer screen that displays the type of metal detected and the battery charge. There are two control knobs: sensitivity and discrimination range adjustment. The three-position switch is responsible for three operating programs: All Metal, discrimination and tone discrimination. The last mode is needed to search for coins. The detector ignores iron, gives an intermittent short signal for aluminum waste, a low tone for nickel, and a high tone for other valuable metals. Ground balance is automatic. There is a ¼” input for connecting headphones. The device is powered by two 9 V crowns.

Just like the older model GO-FIND 40 - already mentioned in the category of devices for beginners - the younger GO-FIND 20 has a progressive rod design that allows you to quickly adjust it to any height or fold it for transportation. Weight 1 kilogram, length when folded is 55.5 centimeters, when unfolded - 130.5. The 8" concentric coil with an operating frequency of 7.8 kHz can withstand immersion in a body of water to a depth of 0.6 meters.

Minelab GO-FIND 20 has two operating modes: All Metal and iron discrimination. Sensitivity has 3 levels of adjustment. 5 volume levels, headphones connected via ¼” input. Ground balance is automatic. There is no Pin-Point mode, no Bluetooth. The screen is informative without backlight. Powered by four AA batteries.

To search for gold

The metal detector is designed to search for gold, including nuggets, and small artifacts such as lead bullets. The complete high-frequency 18 kHz DD coil is just for such purposes. It measures 5" x 8". The device weighs 1.4 kilograms, the rod is adjustable from 106 to 129 centimeters. The detector can be immersed in fresh water to a depth of up to three meters.

Garrett AT Gold has three operating modes: All Metal, Disc 1 for gold, jewelry and coins, Disc 2 only for American coins. The Threshold function - setting the threshold sound - is useful for working in All Metal mode. The Iron Audio function allows you to accurately determine the value of detected metal in a cluttered area by sound. The type of metal will also be displayed on the discrimination scale and through the Target ID coefficient. Ground balancing manual or automatic. The detector independently adjusts the ground balance depending on the degree of soil mineralization. Pin-Point is present.

The controls are simple, each function has its own button. The screen is informative, but without backlight. The metal detector is equipped with full-size Garrett Deluxe headphones. The device is powered by four AA batteries, the charge of which is enough for 30 hours of operation.

Easy to learn, effective and reliable metal detector. 11” DD coil with operating frequency 13 kHz. The device is not designed for searching in water, but the coil is protected from water. Weight is 1.6 kilograms, the length of the rod is adjustable from 110 to 133 centimeters.

Three operating modes: dynamic All Metal, static All Metal and discrimination. The dynamic one works at maximum depth, the static one is useful for searching for large objects. Discrimination has 65 settings, the Notch function allows you to selectively ignore unnecessary ranges. The sensitivity of the operation, tone and volume of the sound are adjusted. For the All Metal mode, the threshold sound and ground balance are adjusted. There is a Pin-Point function.

Backlit screen. In addition to standard parameters, it displays an indicator of the reliability of the find and a Fe3O4 scale, informing about the degree of mineralization of the soil. The metal detector is powered by four AA batteries, the charge of which is enough for 30 hours of operation. There is a ¼” headphone output.

A military-style metal detector, built on the basis of a mine detector, will become a reliable tool for a professional in searching on any type of soil. The electronics are based on pulse induction technology, which is effective in finding gold at great depths, even in water, but is sensitive to electrical interference. In one second, the device emits 730 pulses with a frequency of 18-19 kHz. The set includes Garrett Deluxe headphones and a 12” DD coil that rotates 90° to the side. The durable rod of a progressive design folds compactly for transportation and is adjustable in length from 51 to 172. Weight 2.5 kilograms. The detector can withstand immersion to a depth of three meters.

Garrett ATX operates in two modes: dynamic and static. Dynamic requires constant movement of the coil, works stably with complex soil, and does not emit unnecessary signals, since the detector itself regulates the threshold noise. The static mode is more sensitive and detects metals at greater depths. The discrimination setting has 25 adjustment levels, sensitivity - 13. Ground balance and noise threshold are adjusted manually or automatically. There is a Pin-Point.

It does not have the usual LCD screen, instead there are LEDs. Multifunctional keys. There is a battery charge indicator. Powered by eight AA batteries or rechargeable batteries. The charge lasts for 16 hours of operation.

The flagship from Minelab will be useful to an experienced treasure hunter in searching for treasures on land or in water. The model will withstand immersion in a body of water to a depth of three meters. The 11” DD coil is adapted to work with any soil. FBS2 technology is used: the coil operates simultaneously at 28 frequencies from 1.5 to 100 kHz, which ensures equally effective search for small and large objects at maximum depth. The device weighs 2.3 kilograms, the rod is adjustable in length from 93 to 140 centimeters.

Minelab CTX 3030 has five operating modes and five more empty slots for creating your own programs. You can individually adjust the usual parameters: discrimination, sensitivity, ground balance and threshold tone. It has an intuitive interface. A well-designed Russified menu allows you to quickly configure the device. Pin-Point is present.

The metal detector has a built-in GPS that writes a track. It also allows you to create a route in advance and mark interesting points on the map for later viewing on your computer. The device is equipped with Koss wireless headphones. Powered by eight AA batteries, the charge will last for 12 hours.

This metal detector knows exactly where the trash is and where the treasure is. The main feature of the device is captured in the abbreviation of the model name: the Graphic Target Imaging function provides the user with the exact size and depth of the detected object. You can tell valuable coins and gold jewelry from junk by their appearance without having to dig them up. The information is displayed on the screen in the form of a clear table.

Garrett GTI 2500 operates in five modes: Zero, Custom, Coins, Jewelry, Relics. Discrimination has 24 settings levels. Sensitivity adjustment is available, ground balance is set manually or automatically. The sound is adjustable in volume, you can change the tone and adjust the noise threshold.

Concentric coil 9.5” with a frequency of 7.2 kHz. If you purchase a depth attachment for a metal detector, the detection depth will increase from 40 centimeters to three meters. The screen is large with built-in backlight. Powered by eight AA batteries, enough for 20 hours of operation.

Conclusion

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