The scheme is simple seekers flush

Before hanging cabinets, shelves or picture you want to check: whether under the plaster wiring? Especially if there is a socket, switch ... This can definitely say only those who have it paved. There is a second option: build a simple seeker of hidden wiring.

Seeker flush on one field-effect transistor with earphone

For detection of hidden wiring in most cases it is sufficient a simple device consisting of a field effect transistor, the headset and one to three batteries.

The operating principle of the device is based on the property of the FET change its resistance under the action potentials across the gate terminal. The transistor VT1 - type KP103, KP303 with any letter index (the latter output is connected to the housing gate terminal). Phone BF1 - high resistance, resistance 1600 ... 2200 ohms Polarity battery GB1 is irrelevant.

When you flush the body search of the transistor drive on the wall and a maximum volume of 50 Hz (if electric) or Radio Broadcasting Network) determine the place of the wiring. The indicator can be not only a headset, but also the ohmmeter (depicted by dashed lines) or avometr included in this mode. Power supply and phone GB1 BF1 in this case is not needed.

Antenna may be copper wire segment length of 5 - 8 cm., The board ground foil measuring approximately 55 x 12 mm. or a small cylindrical helix wire diameter of 0.5 ... 0.8 mm., is connected to the gate of the transistor.

Also simple detector hidden wiring formed on one field effect transistor (KP501 with any letter index).

The electric field with a frequency of 50 Hz creates micropower voltage in the antenna, which is a conventional piece of copper wire on VT1 gate length of 15 ... 30 cm. Appear voltage that leads to the discovery of the transistor and the current appearance of the LED. He lights up. Power supply should be not less than 6 V. Possible Replacement transistor - KP502, KP503, KP504 and KP505, but it is best to use a transistor KP504 because its cutoff voltage of only 0.6 V.

E.Artyuhov, "Radio amateur" magazine.

Seeker with dial gauge

Looks like a seeker, too, on one field-effect transistor shown below. The transistor load should dial gauge.

To supply enough battery indicator, 1.5V FET - any of a series of KP302, KP303,

Resistor R1 chosen so that in the absence of electric field was in the arrow 0.

To locate the passage hidden wiring harness will help a relatively simple searcher made three transistors. On the two bipolar transistors (VT1, VT3) assembled flip-flop and on the field (VT2) - an electronic key.

The principle of operation is based on the searcher that is formed around the electric wire electric field - and it picks crawler.

When pressing the switch SB1, but the electric field in WA1 antenna dipstick is not a searcher is located far from power lines, the transistor VT2 open, flip-flop does not work, HL1 LED off.

Suffice it to bring the probe antenna coupled to the gate circuit of the FET to a current conductor or a wire to the power transistor will close VT2, VT3 shunt transistor base multivibrator circuit and stops take effect. LED will start flashing. Moving the antenna probe near the wall, it is easy to trace the passage in her power lines.

The device allows you to locate the place and break the phase conductor. To do this, you need to plug it in the load, such as a table lamp, and move the antenna probe device along the wiring. In a place where the LED stops blinking, it is necessary to search for malfunction.

The field effect transistor may be of any other of said series in scheme and bipolar - any of the series KT312, KT315 or imported analogues S1815, 2N3904 etc. All resistors - MLT-0.125, oxide capacitors - K50-16 or other import small-sized, light-emitting diode - any of the Series AL307, power supply - "Krona" battery is a battery voltage of 6 ... 9, push-button switch SB1 - CM-1 or equivalent .

The antenna probe is a conical plastic cap inside which is a metal rod with a thread. The rod is attached to the nuts housing, inside the housing is put on the metal rod petal that is connected to a flexible conductor assembly with the resistor R1 on the board.

The antenna probe may be of a different design, for example in the form of a loop from a length of thick (5 mm) of high-voltage wires used in television.

The length of segment 80 ... 100 mm, the ends are passed through the housing holes and soldered to the corresponding point of the board.

The desired oscillation frequency of the multivibrator and hence the frequency of the LED flashes can set the selection of resistors R3, R5 or the capacitors C1, C2. To do this, temporarily disable by the resistors R3 and R4, the source terminal of the FET switch and close contacts.

If the search phase wire break point sensitivity of the device would be excessive, it is not difficult to reduce a decrease in the length of the probe antenna or disconnecting the wire connecting the probe with the circuit board.

Almost all parts of the appliance are arranged on the circuit board of fiberglass sided foil 1 mm thick.

Charge arranged in a housing of dielectric material so that the antenna was in the front of the instrument and was removed by hand.

Housing finder can be a plastic pencil box. In its upper compartment secure the board in the bottom - a battery.

On a side SA1 power switch on the front side of the housing LED HL1, headset, or a dial gauge.

All schemes are simple and easy to build for beginners hams. Assembled without errors seekers in the establishment do not need.

Searchers are functional when activated (current) wiring, they can also be used to control the operation of vehicle ignition system. For this it is necessary to bring the seeker antenna for high voltage wires, the flashing LED is determined chain, for which no high voltage is supplied or seek out a faulty spark plug.

They can also be used as a crawler unfit electric lamp garland.

Simple FM-radio two transistors and a single chip.

What is FM-radio? Radio - is an electronic device that receives radio waves and converts the information carried by them into useful human-readable. The receiver uses electronic filters to separate the desired signal from all other radio frequency signals picked up by the antenna, an electronic amplifier for increasing the signal power for further processing, and finally recovers the desired information through demodulation.

The circuit is connected to an available radio station or radio receiver with a corresponding reception range. Staff cut off the speaker or decrease the receiver volume to "zero". After receiving the tone - the signal is an audible alarm violation of a protected area. More ...

A total of two transistors and can be assembled simple electronic home-made, imitating the singing canaries. It is possible to sew in a soft toy bird ... and it come to life! For more information about this scheme. To build the scheme will need two transistors and a few details. More ...

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Driving flush seeker

Another way - it enables load chain (preferably with a brushed motor or simply a powerful) and using a coil of wire with a resistance of about 500 ohms with an open magnetic circuit the connected to the microphone input of any amplifier (music center, tape, etc...) Volume bigger and 50Hz wire in the wall you will find.

Searchers flush

Before we open the floor or wall batter will not be superfluous to make sure that the location you choose is not hidden wiring, power cables or fittings. After accidentally damaging the wiring, you can deprive yourself of all the house, or even the entire block of electricity. In addition, if you'll be working with the metal tool, your life could be in danger. To avoid such troubles are used devices called seekers, or detectors, buried wires. These simple tools to help you protect yourself from electric shock, or to detect wire breakage. Below discussed several concepts such devices, the repetition of which, in my opinion, even a schoolboy available.

Simple Finder flush

For detection of hidden wiring in most cases it is sufficient a simple device consisting of a field effect transistor, the headset and one to three batteries (Fig. 1). The operating principle of the device is based on the property of the FET change its resistance under the action potentials across the gate terminal. The transistor VT1 - type KP103, KP303 with any letter index (the latter output is connected to the housing gate terminal). Phone BF1 - high-resistance, resistance to 1600. 2200 ohms Polarity batteries GB1 is irrelevant.

When you flush the body search of the transistor drive on the wall and a maximum volume of 50 Hz (if electric) or Radio Broadcasting Network) determine the place of the wiring. The indicator can be not only a headset, but also the ohmmeter (depicted by dashed lines) or avometr included in this mode. Power supply and phone GB1 BF1 in this case is not needed.

Searchers flush transistors

Determine the course of the hidden electrical wiring in the walls of the room will help a relatively simple device, made in three transistors (Fig. 2). On the two bipolar transistors (VT1, VT3) assembled flip-flop and on the field (VT2) - an electronic key.

The operating principle of the searcher based on the fact that around the electric wire an electric field - and it catches iskatel.Esli pressed the switch SB1, but the electric field in WA1 antenna dipstick is not a searcher is located far from power lines, the transistor VT2 open, flip-flop does not work , HL1 LED off.

Suffice it to bring the probe antenna coupled to the gate of the FET circuit, to a current conductor or a wire to the power transistor will close VT2, VT3 shunt transistor base and stop multivibrator circuit starts. LED will start flashing. Moving the antenna probe near the wall, it is easy to trace the proleganiya in her power lines.

The field effect transistor may be of any other of said series in scheme and bipolar - any series of KT312, KT315. All resistors - MLT-0.125, oxide capacitors - K50-16 or other small LED - any of the Series AL307, power supply - "Korund" battery or battery voltage 6. .9 B, pushbutton switch SB1 - CM-1 or equivalent .

Housing finder can be a plastic case for the storage of school counting sticks. In its upper compartment secure the board in the bottom - a battery. To a side wall of the upper compartment attached switch and LED, and the top wall - the antenna probe. It is a conical plastic cap inside which is a metal rod with a thread. The rod is attached to the nuts housing, inside the housing is put on the metal rod petal that is connected to a flexible conductor assembly with the resistor R1 on the board.

The antenna probe may be of a different design, for example in the form of a loop from a length of thick (5 mm) of high-voltage wires used in television. The length of segment 80 to 100 mm, the ends are passed through holes in the upper compartment of the housing and soldered to a corresponding point on the board.

The desired oscillation frequency of the multivibrator and hence the frequency of the LED flashes can set the selection of resistors R3, R5 or the capacitors Cl, C2. To do this, temporarily disable by the resistors R3 and R4, the source terminal of the FET switch and close contacts.

Seeker can be assembled and several different scheme (Figure 3.) Using bipolar transistors of different structure - they are executed generator. A field effect transistor (VT2) still controls the operation of the generator in contact with the antenna probe WA1 in the electric field of the connecting cord.

VT1-KT209 and KT361 with any indexes

VT2-KP103 any index

VT3-KT315, KT503, KT3102 with any indexes

The antenna wire 80 ... 100 mm

Driving seeker flush - indicators flush on chips

Driving device shown in Fig. 4. It consists of two components - an AC voltage amplifier, which serves as basis for micropower operational amplifier DA1, and the oscillation frequency sound generator collected at the inverting Schmitt trigger DD1.1 K561TL1 chip, R7C2 and piezo BF1 frequency control circuit.

By arranging WA1 antenna near the current-carrying electrical wires aiming EMF industrial frequency of 50 Hz is amplified chip DA1, whereby the LED lights HL1. The same output voltage of the operational amplifier, with a pulsating frequency of 50 Hz, triggers an audio frequency generator.

The current consumed by the device chips during feeding them from the voltage source 9 is not more than 2 mA, and when the LED HL1 - b. 7 mA. The power source may be a battery 7 D-0,125, "Emery" or similar foreign production.

Sometimes, especially when the required wiring is high, watch the glow indicator HL1 and difficult enough audible alarm. In this case, the LED may be disabled, which will increase the efficiency of the device. All fixed resistors - MLT-0,125, customized resistor R2 - type SDR-38B, the capacitor C1 - K50-6. WA1 antenna serves foil pad on the board size of about 55h12 mm.

A circuit board disposed in the housing of the dielectric material so that the antenna was in the head and was as far from the operator's hand. On the front side of the housing SA1 a power switch and LED HL1 BF1 sounder device mounted initial sensitivity trimmer R2 unmistakable device mounted in adjustment is not needed.

Scheme crawler flush - a simple alternating electric field indicator

A simple indicator of the alternating electric field buried wires can be assembled using as the external electric field controlled voltage divider - resistor R1 and the FET channel (Figure 5.). As a control pulse generator used K122TL1 generator chip. A load generator for indicating the headphones are high-impedance type TON-1 (TON-2)

When an external alternating electric field signal induced in the antenna is fed to the control electrode of the FET (gate) causing modulation of the channel resistance of the FET. As a result, the voltage divider is changed, which in turn causes the generation of a variable frequency.

Scheme flush crawler indicator of the magnetic field

Around a conductor through which an alternating current flows, create a variable, not only electrical but also the magnetic field. Therefore it is possible to record an alternating magnetic field to detect hidden wiring.

Proposed your attention magnetic field indicator (Figure 6) comprises a magnetic field sensor B1, AC power collected on the OS DA1, and the voltage comparator on the OS DA2. The alternating magnetic field in the transmitter coil excites an alternating voltage, which after amplification is applied to one input of a comparator and to its second input is supplied with a constant regulated voltage to the variable resistor R3 engine

If the sensor is located outside the magnetic field, the voltage amplitude at the output of op amp DA2 low (noise and interference), the comparator output will be a constant voltage of 1 V. Therefore .. 1.5 HL1 or LED is not lit, or poorly lit - it depends upon the particular properties of OS instance DA2 and diode light-HL1 When the sensor closer to the conductor with the current at the output of amplifier DA1 appears an alternating voltage sufficient to switch the comparator

The comparator output voltage pulses appear, and HL1 LED turns on to indicate that the subject of the conductor current flows. To increase the sensitivity and noise immunity of the sensor device sensor parallel winding B1 switched capacitor C2. Together with the capacitor winding forms a circuit tuned to a frequency equal to the mains frequency. Response threshold comparator, and thus the indicator sensitivity can be adjusted by the variable resistor R3.

Almost all parts of the appliance are arranged on the circuit board of fiberglass sided foil 1 mm thick. Charge was placed in a separate metal shield case. The amount of payment is chosen so that it can be mounted in a rectangular cage from the exhaust "Krona" battery or "Korund". By Case indicator probe is attached at the end of which is mounted a magnetic field sensor.

As the sensor B1, you can use ready-made universal head of the tape recorder or player. Easy to manufacture sensor independently. The basis of the head is annular madnitoprovod diameter of 7 mm 1500NM ferrite. Ring gently breaking open halves again are glued with an epoxy adhesive, having invested in a pre-gap of non-magnetic spacer (e.g., paper or PCB) with a thickness of about 0.5 mm. This gap - working, it will serve as a sensitive head area. Then, at the ring 400 turns of wire wound NDV 2 0.1 mm. The edges of the ring to be blunt. The wire is wound so that the entire coil is located on the half ring opposite the running clearance. The same adhesive impregnated coil sensor is fixed on the probe and enveloping it with a thin adhesive layer to protect against mechanical damage. Capacitor C2 is placed in the probe near the sensor. Connect the sensor board shielded wire.

The instrument, other than those specified in the scheme, you can use OU K140UD6B, K140UD7A. K140UD7B; LED - AL102A-AL102D, AL307A-AL307N, AL316A, AL316B, AL341A-AL341E, AL360A, AL360B. Resistor R2 - STR or SP4-1, ostalnye- sun, MLT; capacitors C1, C5 - K50-6, K53-1, K52-1, the rest - KM, KLS. Establishing reduces to setting circuit R1C2 on the oscillator frequency. The capacitor may be comprised of several parallel. Generally speaking, the circuit can not adjust, and even completely abandon the capacitor C2, but the sensitivity of the indicator will be less than two or three times. Feed device must be 'from a stabilized voltage source with an output current 60 70 mA. But it is possible and self-powered by batteries "Corundum" or battery - 7D-0.125.

Driving seeker concealed wiring - universal device indicator

This versatile device indicator is for you to simply find, as combines, for all its simplicity, the two indicators. The device makes it possible not only to determine the wiring razed, but also to detect any metal object, located in the wall or floor (fittings, old wires, etc.), and thus easier to find space for a cache of equipment.

The device consists of two independent units: a metal detector and indicator of hidden wiring (Figure 7.). On transistor VT1 assembled HF generator, which is inserted in the drive voltage control mode based on VT1 via potentiometer R6. RF voltage is rectified by the diode VD1 and translates comparator collected on DU DA1, to a position at which the LED is extinguished HL1 and a generator of periodic audio signals collected on DA1 chip is in the off state. R6 rotation VT1 sensitivity control mode is set at the lasing threshold, which is controlled by turning off LEDs HL1 and the periodic signal generator. When injected into the L1 / L2 inductance field metal object generation breaks, komparayayur switches and a position where the LED lights HL1, and the piezoceramic transducer is supplied a periodic voltage with a frequency of about 1000 Hz with a period of about 0.2 s.

Resistor R2 is used for setting the lasing threshold mode when the middle position of potentiometer R6. LED flush compiled on the basis of a micropower operational amplifier DA2. When positioned close to the wiring conductor connected to the amplifier input, route guidance industrial frequency of 50 Hz is perceived WA2 antenna sensitive amplifier amplifies collected on DA2, and switches this frequency LED HL2.

Structurally the device is formed in the housing soldered foil-clad fiberglass and stained nitroemalyu. WA1 and WA2 receiving antennas should be as remote from the arm and being at the head of the instrument. It should be noted that part of the body, which contains the antenna should have an inner coating foil. SB1 switches the operation modes, the power switch SB2 R6 combined as the power source battery used such as "Emery" Currents consumption in various operating modes:

The device is powered by an autonomous voltage source 9 and is enclosed in an aluminum casing size 80H38H27 mm. The operating principle of the following devices. On one of the hidden electrical wires fed alternating voltage 12 from the step-down transformer. The remaining wire is grounded. The device is activated and moves parallel to the wall surface in the region of 5-40 mm. In places the cliff, or the end of the wire device goes off. The device can also be used for detecting lesions in living portable flexible hose and cables.

Driving flush seeker

Driving flush finder taken tranzistror KP-103 to connect the correct polarity to the normal (Chinese multimitru) on the (base) to attach the wire (- invented himself) search faznorgo wire dostantochno good, turn the multimeter to resistance

Detector (LED) flush

During the repair, remodeling, but just even, if necessary, drill a hole in the wall, it is advisable to make sure that at this point there is no wiring, fittings or pipes. All this may Detector flush. This is a small and relatively inexpensive device that weighs 200 grams force, but help may be quite noticeable: there when repairing the chimney with water or wiring, to put it mildly, unpleasant.

Find for plaster or tile hidden pipes or wires - a task that can perform a device for determining the latent leashes

Types of devices for the detection of concealed wiring

Devices for the detection of buried wires have several types. They work on the basis of various phenomena and serve different purposes.

Talking about the types of devices to begin with, as they call this equipment. The official name - Detector flush. May call: detector, indicator, signaling, seeker determinant tester. In general, the mass of names, but the essence is the same. These devices (some of them) can be found hidden in the wall of the wiring frame (wooden or metal) and metal or plastic pipes.

Devices are different according to the principle of action and functionality

There wiring detectors, valves, metal frames, which are tiny metal detectors. They are around us create a magnetic field, which react in the wall hidden metals. Detect any metal, be it a screw, a water pipe or wiring.

These devices are generally inexpensive, many are quite accurately indicate the location of a wall, and some of them under the floor (at a sufficient detection range). The disadvantage - an abundance of metals is difficult to determine where it is located. For example, in the concrete wall to determine where the armature, and which wiring. To be precise, the bearing device for the detection of this type of wiring, it is simply impossible.

Metal Detector - simple device, but it can sometimes be useful

Some models of devices, metal detectors can detect not only metal, but wood or plastic, hidden in the wall. They work on a different principle - determines the density of the materials for the passage of the pulse rate. It is already quite sophisticated devices more expensive, often have a liquid crystal display, which displays information that is found in the wall.

There is another type of equipment for wiring search - detectors (also called testers and indicators). These devices respond to an electromagnetic field, which creates a current flowing through a conductor. That is, this type of instrument detects the presence of a well-wiring under load or stress. If a wire is broken or need to find a pipe or metal frame, wiring detectors are useless.

Have these devices is one drawback - they are useless on wet walls, since signals fed almost constantly. Wet wall "respond" to the electromagnetic field of the device, causing it to constantly ringing.

So as you would often require both types of equipment, it has been created a universal device for the detection of the wiring. In such equipment usually has several operation modes - for the detection of metals in general and separately for wiring search. These modes are available with varying degrees of sensitivity - to determine the exact location of the found communication with the wall.

Universal machines can not only find metal but also wood and plastic, however, the plastic must be filled with water

Typically, such a device for the detection of concealed wiring refers to a class of professional equipment or proluprofessionalnogo. They work usually more accurate, but there are many times more expensive. Also note that some models (in particular VOSCH DMF 10 Zoom) require presetting. Before you use it for its intended purpose, it is necessary to include and some time to hold pressed against the wall. And in the wall should be no voids, metal and other irregularities. After this setting, the unit is very good all identifies, but if they are to work immediately after the shows nonsense.

There are several things that are common to all the devices to search for hidden wiring. Only they occur in varying degrees - the cheaper models more, expensive - less. So here's the problem:

  • Each scanner has a top metal determine the depth (and not only). The closer to the depth of the desired objects are, the more likely mistakes: two that are a few centimeters from each other object, can be defined as one or not at all to decide.

Not always harness is where there should be logically

As already said, these things the less, the higher the class of the device. So when working, always remember that mistakes can be and work accurately and certainly a power failure.

What to look for when buying

First you need to decide on a set of features that you need. If you only need to find the wiring, it is quite cope with the low-cost detector. If you have yet to determine the frames or pipes, you need a device more seriously.

Oobnaruzhitel flush handy during repairs

When buying, pay attention to what materials can determine the model on the depth at which these materials are located. Cheap models are usually looking at a depth of 20 mm, which is not enough - a layer of plaster is usually more - about 30-40 mm. In general, it is desirable to "see" the device to detect hidden wiring as far as possible. However, such models are more expensive.

Scanning depth - one of the key features

It will be necessary to determine the type of alert. It comes in three types:

  • Sound signals are of different pitch and / or duration. According to the type of signal can be discerned that it had found the device at this point.
  • Tally. There are LEDs that turn on when it detects wiring or connections. They can illuminate in different colors, with different intensity. Knowing how the device responds to any material or degree of approximation, be accustomed, can be fairly accurately identify the "findings".

The presence of the screen makes it easier to use

In general, it is necessary to get used to any detector - to examine what signals it is served on the approach to each type of "finds". To do this, first check the response to the open wires, fixtures, timber, then try to find hidden in the wall or in the floor. In addition, before starting work, it is desirable to make incredible - read the operating instructions. It usually helps to quickly learn how to handle the appliance.

Before buying the model chosen test it. As the object one can use any wire to appliance. Look, whether declared scanning depth real - try the "find" the wire at different distances from it, close it, board, plastic pieces, and so on, then try again. If all tests run normally, you can buy.

Before buying, check how the device works

In this section we have tried to collect the most successful model of reviews detectors flush. As usual, on the same model sometimes have conflicting reviews. We have tried to select those in which the number of positive responses is significantly higher than the negative.

LED flush is needed even when you want to beat a nail

This unit is available in Ukraine is relatively little $ 25-30. Received three times more positive ratings than negative. It can be used for finding the conductors under tension. When the light is off, and the network is desirable something load (e.g., turn on the lamp). energized wires determines success, but if the conductor is laid in a plastic tube, he could not see him.

Woodpecker - a device hidden wiring detection

Detector flush Woodpecker has four sensitivity mode:

  1. determines the location of a conductor with an accuracy of 10 mm;
  2. to 100 mm;
  3. to 300 mm;
  4. to 700 mm.

That is, to start the work necessary to include the 4th mode. When approaching the wire, LED starts blinking, you will hear a squeak. The closer to the conductor, the blinking frequently, the sound louder. Having found out the border of the most intense signals put a mark on the wall. The operation is repeated on the other side. Next, the mode is changed and the search begins with the already marked boundaries. So, gradually we find the location of a conductor with an accuracy of 1 cm in both directions.

This device has a liquid crystal display and two operating modes: determining a metal (magnetic and nonmagnetic), wood and wiring. There Zoom mode to increase the sensitivity of the device. But its inclusion leads to the fact that the detector begins to respond not only to the wiring, for example, but also to the vicinity of the metal rack or reinforcement bars.

Bosh dmf 10 zoom

When approaching object is turned to the desired sound and light indicators. The display device illuminates the scale, which can be determined by how close the device is to the conductor - the closer, the more shaded bars on the scale.

Also, the display shows graphics of found materials:

  • strikethrough magnet means nonmagnetic metal (aluminum, for example);
  • Lightning graduated - wiring under tension;

In order to be able to properly find objects, you must read these instructions. There is described a lot of nuances that will correctly interpret different situations and not to make a mistake at work.

Determine the Bosch GMS-120 flush

Another detector known firm. Also metal wiring and look for wood. There are three modes of operation:

  1. magnetic and nonmagnetic metals;
  2. wiring;
  3. wood.

It has good reviews from the previous version by the absence of Zoom function. But in the middle of the housing there is a hole through which you can notice on the wall of the place of passage of the conductor, or vice versa, a place that is free from every kind of metal - for safe drilling in the wall, ceiling or floor.

Out of all the reviews you can deduce a few practical recommendations:

  • if the instrument is "links" across the wall, touching the wall of the second hand (remove crosstalk) will work fine;
  • if you do not get into the testimony, read the manual, it should explain everything clearly - when to use which mode.

In general, when a certain experience, can quite accurately determine where the wiring.

The product of domestic production is good because it allows you to not only detect wiring energized. He may even find a broken wire in the wall. To this end, the appliance should be conducted along the conductor. Until the wire is intact, light display is enabled. In a place where the light goes out and is open. To ensure conduct a similar operation on the other side (the test can be repeated twice).

It is worth this little device - $ 20-25, but the popularity of it is not very high, there were no reviews.