Often a situation arises when the question becomes relevant: “How to connect two phones together?” For example, you need to copy a large video or program file from one phone to another. Or move a large number of music records and photos. In addition to the traditional sending of files via Bluetooth and Wi-Fi channels, there are several more ways. This article will show you how to connect two smartphones with a USB cable.
Is it possible to connect smartphones with a cable?
In order to connect two phones with a cable, you need to have a micro-USB cable - USB and a USB-female adapter for "OTG" in stock. To begin with, it is worth noting that only phones that support the One-touch-Go (OTG) function can be connected. Thanks to this technology, you can connect any peripheral device to your smartphone, including a second phone.
USB adapters can be labeled "master" or "slave", that is, they can be master and slave. If there is an adapter marked "master", then the phone with this adapter will be the main one, and the second phone will be displayed on its screen as a removable media. If the adapter is marked "slave", then the situation will be mirrored.
All modern smartphones support OTG technology. It was designed to connect a keyboard, webcam, removable media, printer, mouse, and other peripherals to Android devices.
To connect two phones, you first need to connect a USB-female adapter to one phone, and a micro-USB cable to the second phone. After determining the cable and adapter by the phones, you can safely connect them together.
When connecting two phones, you do not need to use additional software. For this, the interface of a standard smartphone file manager is enough. In this case, the contents of the slave phone are displayed in the file manager of the main phone as the contents of a removable media. After connecting the phones with a cable, you can copy files at high speed and not worry about a possible disconnection or data loss, as is the case with data transfer via the Bluetooth channel.
How to connect a smartphone with a tablet?
No less popular than smartphones today are tablets. And so the question of how to connect a tablet to a phone with a USB cable arises quite often. Moreover, most modern users often have both of these devices. And sometimes it is very necessary to quickly copy a large amount of information from one of them to another.
As in the situation with two phones, a micro-USB cable - USB and a USB-female adapter for the "OTG" function will come to our aid. But some tablets already have a built-in USB interface. In such a situation, the task is simplified: only a micro-USB to USB cable is required for connection. Just remember that the built-in USB-female often has the manufacturer's label "master", and take this into account when connecting.
Once you know how to connect your phone and tablet via a USB cable, transferring information between the two devices is even faster and more reliable. Of course, in the world of wireless technology, this capability is not always necessary. But situations are different. For example, one of the devices has a broken Wi-Fi adapter. Then data transfer via the USB interface will be the only and no less reliable way.
Having two telephone sets, a coil of two-wire wire of sufficient length and a small number of radio components, you can organize your own telephone line for two subscribers. For example, to arrange a connection between two neighboring apartments by throwing a wire between the windows, or between neighboring country houses, between the house and the gazebo. First of all, let us recall from the school physics course how the telephone works. In the simplest case, these are two telephone capsules interconnected by a two-wire line.
When they speak in front of one capsule, its magnetic membrane moves from sound waves and induces some alternating voltage in the coil, which is fed through the wires to the coil of the second capsule and sets its membrane in motion. It turns out that the membrane of the second capsule moves in the same way as the first, creating sound waves that can be heard. But theoretically, such a connection is ineffective, too large losses in the wires and low efficiency of the capsule.
Therefore, a real telephone set has a carbon microphone, the resistance of which changes in time with speech. In addition, a certain constant voltage is supplied to the line. As a result, it turns out that a carbon microphone connected to the line, changing its resistance in time with the speech, causes a change in the current strength in the line.
Thus, an alternating current is obtained in the line, which changes in time with speech. This current feeds the capsule of another telephone and emits sound waves that are quite distinct and loud.
A schematic diagram of a simple telephone line is shown in the figure. Two electronic telephones are used - handsets with push-button dialers, but you can also take simple
disk devices. They are connected by two wires. A constant voltage of 60-80V is supplied to these wires through the resistance R1. When the tubes of both SLTs are hung between these wires, there is a voltage of 60-80V, since in this state the internal resistances of the SLTs are very high.
Let's suppose that they picked up the phone TA2, while its lever switch connects its conversational node to the line and the resistance of TA2 decreases sharply, so much so that the voltage in the line drops to 8-10V (the voltage drops because resistor R1 and the resistance of the conversational node TA get voltage divider, and the line is connected just through this divider).
If you start talking in front of the TA2 microphone, the resistance of its conversational node begins to change in time with the speech, which means that the total resistance of TA2 also changes. In this case, R1 remains unchanged and the voltage in the line changes in time with speech. The telephone set TA1 is also connected to this line, and if you pick up its handset, you can hear what is being said in front of the TA2 microphone. If subscriber TA1 answers, subscriber TA2 will hear his voice. This way you can talk to each other.
To call a subscriber, the telephone set has a bell or a buzzer, it is always connected to the line when the TA handset is hung up and responds to any significant voltage drop in the line. If you pick up the TA2 handset, then the TA1 bell will "ring" once, because there was one voltage drop in the line, hang up - TA1 will "ring" again.
As part of the TA there is a dialer, push-button or disk, it does not matter, in any case, it serves to create voltage drops in the line, these drops are received by the telephone exchange, count them and thus determine the subscriber's number. In our case, there is no telephone exchange, but the dialer can be used to call the subscriber. If you dial the number "9" TA creates nine voltage drops in the line, which means that the second TA will "ring" not once but nine times, if the number "0" - ten times.
Thus, in order for you to call your friend on TA1 from your TA2 phone, you need to pick up the TA2 handset and dial "O" (or another number) several times in a row. As a result, TA1 will ring, your friend will hear the call, and by picking up the phone he will be able to talk to you. In the same way, you can call TA2 from the TA1 device.
A constant voltage for powering the line is obtained from the mains voltage of 220V using a transformer T1 and a rectifier with diodes VD1-VD4. The ripple of the rectified voltage is smoothed out by the capacitor C1. Transformer T1 can be made from a small-sized transformer from a mains source to power toys or portable equipment. It is necessary to disassemble the source case and by connecting the transformer with an extension cord to the network, measure the voltage on its secondary winding. Suppose the voltmeter showed 6V.
We need 50 V. Now we disconnect the transformer from the network, disassemble its lamellar core and unwind the secondary winding (not the network one), carefully counting its turns. Let's say we counted 120 turns, this one despite the fact that the output voltage was 6V. Now we calculate how many turns this transformer has per 1V: 120/6 = 20, total 20 turns. We need 50 V, so the secondary winding should contain 20x50 = 1000 turns. We take a thin winding wire, for example, PEV 0.06 or PEV 0.09, and carefully wind 1000 turns with this wire instead of the old secondary winding.
Then we assemble the core of the transformer. You can take a ready-made transformer that produces at least 36V and a maximum of 50V.
Diodes D226 can be replaced with any rectifier, for example, D7 or modern KD102, KD103, KD105, KD226, KD209. Capacitor C1 for a voltage of at least 100V and a capacitance of at least 160 microfarads. Resistor R1 with a resistance of 1 kOhm to 1.8 kOhm for a power of at least 2 watts. Toggle switch S1 of any type.
Structurally, the power supply can be connected to the line anywhere, near TA2, near TA1, or even in the middle. For example, if TA2 is located in an electrified room, and TA1 is in a garden gazebo, it is clear that the source is connected near TA2.
When installing, do not reverse the polarity of the connection of the capacitor C1 and diodes. For D226 diodes, a graphic image of the diode is applied on the case, along the case, so that you can understand the purpose of the pins.
Despite the rapid decline in the popularity of landline telephones, there are not so many people who are ready to refuse them flatly. Admit it, it happens that sometimes it is extremely difficult or even impossible to do without traditional communication.
To connect the device to the switching network, you need a low-current node, the installation of which you can handle yourself. We will tell you in detail how to connect a telephone socket without calling a wizard.
There is absolutely nothing complicated in the schemes and methods, and the useful information we have proposed, as well as photos and videos, will help to deal with the issue.
Designs of landline telephones are modified and improved every year. And modern devices are significantly superior to their predecessors, standing out against the background of their high reliability and ease of use.
To ensure the smooth operation of the device, two conditions are necessary:
- The presence of a valid communication line from the PBX.
- Possibility of electrical connection of a stationary device to this line.
The only thing that does not change in the field of telephony is the principle of operation of landline telephones. However, there are significant changes in designs and connection methods.
Old and new options for telephone switching are presented in a photo selection:
Image gallery
From the tools for the work it is necessary to prepare:
- building level;
- cross knife;
- voltmeter;
- screwdriver
- wire cutters;
- graphite pencil;
- protective gloves;
- Double-sided tape;
- perforator (if mounting a new point).
When choosing a screwdriver, they are guided by the type of surface and dimensions of the screws used for fastening. To minimize the likelihood of electric shock, it is better to perform all manipulations with a screwdriver, the handle of which has insulation.
Having outlined the installation location of the connection point, using the building level, correct the horizontal and vertical position of its position
To connect a hidden type socket, you must first make a hole in the wall for its installation -. This can be done using a puncher equipped with a special crown with a diameter of 60-70 mm.
In the absence of such, the work can be done with an ordinary hammer with a chisel. But manual labor will take much more time and effort. Then, to the hole made, it is necessary to drill a channel for laying the telephone cable.
There are certain nuances when installing a socket box in.
Stage #2: Stripping the ends of the veins
Before proceeding with the melting of the cores, it is necessary to strip the ends of the wires by removing the outer layer. Bare enough extreme 4 cm of the wire.
When stripping a telephone cable, remember that it is very vulnerable to damage. And broken wires will only lead to equipment malfunction. Therefore, it is important to use a specialized .
Since it is not always possible to carefully cut the first time, experienced craftsmen recommend making some margin along its length when laying the cable. The extra wire can then be hidden under the cover of the device.
Removing the protective insulation from the ends of the cable should be done very carefully, using a cross-cutting knife, a sharply sharpened blade or side cutters.
The task of the master is to strip the ends of the wires from the braid so that in their bare form they are intact and devoid of any defects.
Step #3: Connecting the Outlet Wires
Stripped wires with separated conductors are connected to the connectors of the box itself, focusing on the designations indicated on the front panel of the indoor unit. With a closed installation method, for ease of connection, the wires are made protruding beyond the wall plane by 50-80 mm.
To observe the polarity when connecting wires, they are guided by the rule: red insulation on the line with the “-” sign, and green braid on the “+”
If the polarity rule is not followed, there is a high risk that the telephone will malfunction from time to time during operation.
At this stage of work, you will need a voltmeter. With it, you need to check the readiness of the communication line. The voltage in the line should be in the range of 40-60 volts.
The connected cable cores are applied to the clamp and tightly tightened with special screws, ensuring a secure fit. The shape of the grooves to which the cores are attached facilitates the installation process. It is not necessary to wrap the joints with electrical tape.
When connecting devices, the design of which is equipped with four fork-shaped contacts, only two central contacts are used.
When performing surface mounting, at the final stage it remains only to close the housing cover with a latch and fasten it with screws. The finished outlet is attached to the wall or floor, "planting" it on double-sided tape.
With a closed installation method, making sure that the wires are not intertwined in the socket, according to the applied markings, the indoor unit is mounted in the wall. Having given the block the desired position, the structure is fixed with expansion screws and self-tapping screws.
At the final stage, it remains only to eliminate the gaps between the socket box and the wall, covering it with gypsum mortar, and also close up the channels with the laid telephone cable.
After the gypsum has acquired the desired strength, the protective edging is put in place and the front panel is attached. In modern devices, the protective edging snaps onto the indoor unit, and the front panel is attached by screwing in screws.
There is nothing difficult in connecting a telephone socket. The only thing - you should not save money by purchasing equipment of a low price range. It does not always meet the standards and can fail even at the connection stage.
Share your personal experience of connecting a telephone socket, leave comments on the article and ask questions. The contact form is located below.
Hello, dear lovers of experiments and experiments with your own hands!
We have already touched on the topic of telephone communication on the pages of the blog about science and technology with our own hands. Then it was about a phone made of plastic cups. Unfortunately, such a phone demonstrates some laws of acoustics very well, but in practice it can only be applied in fairly ideal conditions - the phone's thread must be taut and must not touch any obstacles. And the length of the thread is limited. Another thing is a regular wired phone. There is no doubt about its applicability. Despite the spread of mobile communications, it will not soon be ousted from apartments and offices. We will talk about it, and at the same time we will build our own simplest telephone network, devoid of the above disadvantages.
Did you know that telephone communication dates back to the 19th century, and since then the fundamental design of the telephone has not changed much? It really is. Of course, the phone has become different in details - the modern telephone set includes electronic components that simply did not exist at the time of its invention. In telephone networks, there are automatic telephone exchanges that switch subscribers among themselves. There are various telephone services. However, the purpose of a telephone set of any circuit has remained unchanged since its invention by Alexander Bell in 1876 - converting sound into an electrical signal and transmitting it along the communication line to the desired subscriber and converting it back into an audio signal. And in this classical telephone communication has no equal.
To demonstrate this statement, let's compare the aforementioned plastic cup telephone with a conventional telephone network. We have already talked about the shortcomings of the first - this is a short range, the absence of obstacles in the path of the communication line, ensuring the tension of the thread. In addition, let's estimate the speed of sound propagation in the first and second type of communication. Thus, the speed of propagation of a sound wave in iron is approximately 5000 meters per second. Even if we found a way to eliminate the attenuation of the sound wave, the sound from, say, Moscow to Vladivostok would take 30 minutes! I don’t know about you, but I would quickly get tired of such a phone - the radio signal reaches Mars faster! Another thing is the speed of propagation of an electrical impulse - 300,000 kilometers per second. There is no better intermediary for sound transmission. You just need to come up with a way to convert a sound wave into an electrical signal and vice versa. And Alexander Bell just found such a way.
In his telephone set, the sound signal was converted into electrical impulses, which reached the opposite device through the wires and were converted back into an audio signal there. Everything turned out to be as simple as it was ingenious! Of course, in the first telephone network there were no telephone exchanges, no dialers, no other modern telephone charms. There were only two telephones connected by an electric wire. I suggest you check the possibility of the existence of such a telephone network. Moreover, such a telephone connection is quite realistic to use in practice, for example, to telephone a home workshop. And if you take such a phone to the place where your child plays, then it will remain a key link in many games for a long time.
So, we will need:
- two telephone sets;
- electrical wire.
- DC source.
- telephone patch cord.
As for the electrical wire - you can not limit yourself here - any length of telephone wire can be used for your experimental or domestic needs. The type of wire can also be almost any. I used 30 meters of twisted pair in my experiments.
As for the direct current source, we can say the following. In the telephone network, the line voltage at rest (on-hook) is 60 volts. But for our experiments, the voltage from two Krona-type batteries will be enough. You can also use a 12-20 volt power supply.
Take the patch cord and cut it in half.
We clean the ends. The cores of the patch cord are often very thin, it can be inconvenient to simply strip them with a knife. You can burn them.
If using batteries, connect them in series. It is convenient to use clip-contacts, but you can do without them.
We include our current source in the circuit in series, that is, in the gap of one of the wires.
Don't forget to isolate contacts.
Everything you can use! The only significant drawback of such a scheme is the inability to call a subscriber. To provide such a possibility, it is necessary either to supply an alternating voltage to the line, as is done in urban networks, or to conduct an additional line to provide a sound or light call.
