Remote controlled sockets. Socket with remote control Wireless Wi-Fi socket

Most likely, you have more than once had such moments when you settled into your favorite chair or cozy bed and remembered that you forgot to turn off the TV. At this moment there is absolutely no desire to get out from under the blanket and turn it off. We offer you a socket with a remote control, which will help you forget about such an unpleasant little thing forever.

A wireless socket with a remote control is designed to control household appliances from a distance, for example, a microwave oven, TV, iron, etc. It will help save your time, energy and effort. It also prevents fires by controlling the voltage supplied to appliances.

A socket with a remote control really makes your life easier. Now you need to turn off the TV or turn on the air conditioner. You just need to press the remote control button from the comfort of your bed.

When going to the bathroom at night, turn on the light before getting out of bed and this will allow you to get to the bathroom silently and without tripping over furniture.

Reduces energy losses by turning on household appliances in a timely manner and helps save money. With a remote control socket you can reduce your electricity bills by 15%.

A fairly powerful signal allows you to control devices even through a wall or a closed one. Programmed for immediate use, the socket allows you to control appliances using a remote control. Simply plug the device into a power outlet.

Peculiarities

The socket can be connected anywhere and can be turned on and off using the remote control;
Easy to install and use, saves energy;
LED indicators on the socket and remote control;
Great for controlling household appliances.

Notes

Suitable for indoor use only;
Do not exceed the maximum permissible load of 2.5 kW.

Characteristics

Voltage: 120V-230V 50Hz-60Hz;
Transmission frequency: 433.92 MHz;
Radius of action

Tsugunov Anton Valerievich

Reading time: 5 minutes

One of the simplest and at the same time effective ways to control the operation of electrical appliances from a distance is to use a device such as a remote controlled (RC) socket.

Classification

Today, the choice of a particular model of remote-controlled outlet should be dictated by the compliance of its technical characteristics with the operating conditions. First of all, we are talking about the power of the device and the maximum range over which its operation can be controlled.

The most popular types of such devices are:

Wireless socket controlled via radio channel. The cheapest and most practical type. To ensure its operation, a remote control is required that allows you to turn on and off individual consumers or their groups from a distance of up to 30 meters.
GSM socket. It is controlled using a mobile phone, thanks to which the distance from which commands can be given to turn it on or off is practically unlimited. This device does not require a special remote control, but it cannot be used in areas where the mobile phone signal is weak or jammed. In addition, such products today are quite expensive, which is perhaps their main drawback.
WiFi sockets. These devices are controlled using a smartphone or laptop via the Internet. The socket is connected to the control device using a WiFi router. The disadvantages of these models include a fairly high price with a not too wide list of additional functions.

Design of remote controlled devices

It should be noted right away that the devices in question cannot be fully considered classic power sockets, which are equipped with an additional remote control unit.

The remote-controlled models currently on the market are products that, in appearance, most closely resemble an adapter or socket with a timer. That is, they are equipped with a standard electrical “plug”, which is designed to plug a remotely controlled module into an ordinary plug socket.

The main purpose of this device is to open or close the power circuit to which the electrical appliance is connected. This allows you to control the operation of the consumer at a distance, without making any changes to its design or to the power supply network. In fact, the same function is performed by switches with remote control, of which there are quite a large number on the market. The main difference between these devices is that connecting the outlet is much simpler and does not require intervention in the wiring design. This makes it easy to move it from place to place, which is extremely convenient when working with some consumers.

Thus, a remotely controlled socket is essentially a switching device that, upon command from the control panel, opens or closes an electrical circuit.

Radio controlled device

The most common option for remotely controlled devices that are part of the home electrical network today is a socket with a remote control.

In order to ensure reliable transmission of control signals, it uses radio wave transmitters, which allow the signal to be transmitted over a distance of 30-40 meters and are insensitive to interference. Unlike infrared remote controls, their radio wave analogues provide reliable reception of the control signal within the stated range, even if there are concrete walls between the source and receiver.

As a rule, 9 or 12 V batteries are used to power the remote control. One such power source lasts for about a year.

Most models of radio-controlled sockets come in a kit, which includes 3 to 5 separate devices controlled from one remote control. Accordingly, such a remote control is equipped with buttons, the number of which depends on the maximum possible number of devices connected to it.

Thus, a radio-controlled socket is the cheapest and at the same time quite effective device designed to turn on and off electricity consumers at a distance.

Connection

Before starting work, the wireless socket is combined with the remote control, for which you need to press the corresponding buttons on its body and on the remote control itself. At this moment, both devices are paired with each other via one of the radio channels available to the remote control; the successful completion of this process is signaled by a light indicator on the socket body.

It should be noted that a theoretically unlimited number of devices can be controlled via the same radio channel; the only limiting factor in this regard is the functionality and ease of use of such a system.

Since the purpose of these devices is to provide remote switching on and off of any electricity consumers, the scope of application of such sockets seems to be extremely broad. An example of their use is:

Control of lighting systems for apartments, houses, and large external areas.
Turning pumps and fans on and off.
Control of garage doors and electric door locks.
Opening and closing windows or dampers in ventilation systems.
Remote control of telecommunication systems.

This socket allows you to issue a command to reboot the equipment in the event of software failures.

Advantages of using remote controlled sockets:

Significantly increase the convenience of managing remote consumers of electrical energy. This quality is especially valuable for people with disabilities.
Easy to connect and operate the device. The ability to move it to any place where a standard electrical outlet is installed.
There is no need to make changes to the electrical wiring structure when installing such a device.

Flaws:

The use of radio waves may sometimes interfere with devices such as pacemakers or hearing aids. Therefore, before installing sockets with remote control, you should check them for electromagnetic compatibility with the above-mentioned devices.
Additional elements in the design of any electrical network inevitably reduce its reliability. Connecting such switching devices may cause unintentional operations and unexpected switching on of consumers. It is imperative to provide for this possibility and take measures to prevent the negative consequences of spontaneous activations.
It is not recommended to control most models of sockets with remote control from a distance of less than 1 meter.
Installing radio-controlled outlets in walls that are covered with sheet metal significantly reduces the range of these devices.

When choosing sockets with remote control, you should pay attention to their characteristics, which determine the permissible operating conditions and the power of the connected load. Thus, most models of such devices allow you to connect electrical appliances with a power of 1 to 1.5 kW, in some cases this is not enough, so you should pay attention to more expensive sockets designed for a power of up to 5 kW.

As for operating conditions, sockets with remote control are classified according to IP (enclosure protection degree) in the same way as other electrical appliances of this type. For example, the RCS 1044 N socket, which has an IP44 rating, is protected from objects larger than 1 mm getting inside its housing, as well as splashes falling in any direction. Such characteristics make it possible to use this device outdoors.

These devices are an extremely convenient type of remote controlled outlet. As their name suggests, the operation of such devices can be controlled using a mobile phone. For this purpose, the GSM socket housing has a slot for installing a SIM card.

A card provided by any mobile operator is suitable. Control can be carried out by calling or sending a message (blank or with a specific text). It should be noted that transmission of control commands to such an outlet is not possible from any mobile phone, but only from one whose SIM card number was previously registered in the device’s memory. The maximum number of such numbers, as a rule, does not exceed 5 units.

The main advantage of a wireless socket is the ability to control its operation from anywhere where there is mobile communication. Another positive point is that there is no need to use a remote control, which requires power from a separate battery and, moreover, can be easily lost.

To control the power supply of computers, special GSM socket modules are used, which include up to 6 separate connectors. Each of them is assigned a serial number, which allows you to control any device individually or all at the same time using your phone.

The disadvantages of GSM sockets include their relatively high price and the need to purchase a SIM card. In addition, using a telephone it is often impossible to determine the current state, that is, it is not clear whether the device is on or off at the moment.

WiFi sockets

The operation of many modern devices can be controlled using WiFi wireless communication. The electrical outlet is no exception in this regard.

The main advantage of WiFi sockets is the ability to control their operation using a computer or tablet via the Internet. In addition, such devices are often equipped with timer functions, which are very convenient to configure in a special mobile application.

To connect and configure this product, you must use a package of drivers, which can be completely freely downloaded from the Internet or downloaded from the installation disk included in the package. After installing the application on your smartphone or tablet and connecting the socket to your home WiFi network, the socket must be found in the smartphone menu. After which a connection is established between these devices.

You can control the operation of such an outlet either via the Internet or directly via a WiFi connection. However, to do this, the smartphone and the outlet must be within range of the router.

The main disadvantage, which significantly limits the popularity of sockets of this type, is their high price with rather modest functionality.

Despite the ability to connect to a computer, such a device cannot be considered an element of the “smart home” system, since it does not provide for full integration into an intelligent control system. In addition, almost all models of WiFi sockets produced today are not capable of receiving and transmitting information about the connected load, current and voltage, as well as ambient temperature and other data that affects the operation of the power supply system. Accordingly, the installed program cannot make any decisions if these parameters deviate from the norm.

Control of air temperature in the room. When a certain value is reached, the outlet can be turned on or off independently.
Timer functions.
The ability to control the outlet from several separate devices (usually at least 5 users).
Availability of an autonomous power supply that allows you to save device settings in the event of a power failure.
Informing the user about the occurrence of emergency situations, such as a sharp increase in temperature or loss (switching on) of voltage in the network. In this way, additional fire alarm redundancy can be implemented.

Manufacturers of remote control devices

As in many areas of the modern market, the main manufacturers of such devices are Chinese companies. Since the use of remotely controlled sockets is not yet widespread, such eminent European manufacturers as Legrand or Scneider-electric, although they have similar devices in their model range, still rely on more traditional and popular technical solutions.

At the same time, technologies for the manufacture of electrical devices for household use are developing very quickly, so we can soon expect the appearance on the market of reliable, functional and inexpensive devices that allow not only remote, but also centralized control of the operation of all elements of electrical wiring.

Thus, the use of remotely controlled sockets can greatly simplify the operation of individual electricity consumers, as well as their groups. However, the installation of such devices should be approached with caution; their use is justified only in cases where manual switching on of electrical appliances is very difficult for some reason or there is a need to control their operation over significant distances.

New technologies have long stepped into our homes. The automation system of a residential and commercial building is not a whim, but a comfort that is created with the help of the latest devices. Wireless sockets are devices that simplify human life and create the most comfortable and modern space around. Now opening garage doors, windows, turning on an electric kettle and much more is not at all difficult. To do this, you do not need to make any physical effort; just press a button on the remote control or open the application on your smartphone.

What is this?

A wireless socket is a modern device that has gained popularity quite recently. With its help, you can effectively control the operation of electrical appliances from a distance using a remote control or gadget. Three types of sockets are produced:

wireless, which is controlled via a radio channel;
Wi-Fi.

GSM models operate using a smartphone, so the control distance of the device is not limited. It works without a remote control, but the device is expensive.

Wi-Fi sockets operate via a smartphone or laptop via the Internet.

Possibilities

Wireless sockets with remote control allow you to install a switch in any part of the house; where it is most convenient for the owner. So, what are the features of such sockets and their capabilities?

The user can control the outdoor lighting.
Open the garage door without leaving the car. The outlet is much cheaper than automated garage door systems.
Close and open the lock on the entrance gate and door.
Adjust the position of windows to ventilate the room, for example in a greenhouse.
Turn off electrical appliances without going near them.

Wireless sockets have a lot of capabilities and are easy to install and configure.

Principle of operation

Wireless sockets operate on the basis of technology that resembles the remote control circuit of an electrical appliance. A remote controlled socket includes two main elements: a remote control and the socket itself. Each component has its own power supply system. For example, the socket is powered by mains voltage, and the remote control is powered by batteries. The interaction scheme consists in the ability to transmit a signal from the remote control to the device. This signal contains certain information, but it depends on the type of receiving and transmitting device.

The socket is always installed as an external one. This allows for interaction between the old and the new. The signal source becomes a radio frequency remote control. A pulse is generated inside the remote control. When a button is pressed, a combination of signals is transmitted. It has a wave structure, as well as a phase, modulation and amplitude information transmission system. The signal receiver is located in the socket, it interprets the received signal, extracting the necessary data.

Models

Wireless sockets are a modern device that makes life easier for people. Manufacturers offer many models with remote control. There are most Chinese sockets on the market, but this does not mean that they are of poor quality.

List of the most popular devices:

TW686. The set includes two sockets and a remote control that simultaneously controls four devices.
YKI-3. Three low power sockets with manual control buttons.
Jebao RC-400. You can control the operation of electrical appliances at a distance of up to 50 meters.
Proove. This company produces automated sockets that are installed in a regular one to turn on and off various equipment at a distance of up to 30 meters.
CoCo. Device with radio adapter and memory. There is a lighting function.
ExpressPower. A set of sockets that are controlled using radio key fobs and a smartphone. They are also connected to the security alarm system.
Z-Wave. A company that produces products for the modern home, including sockets connected to the electrical network.

Devices with a remote control are cheaper than those controlled using a smartphone via Wi-Fi. A remote control and three radio adapters for a 1 kW socket APA 3 - 1500K CoCo/Trust 71066 3 is an excellent choice for a large home. The device controls lighting and electrical appliances connected to a regular 1500 W outlet. Up to four additional transmitters can be connected to one receiver. It works at a distance indoors of up to thirty meters, and the signal reception area outdoors is up to seventy meters. Power is supplied via an adapter, the remote control is battery-powered, and the body is made of white plastic.

The wireless set with remote control Heliosa 205S-1 operates with a single heating device. The kit includes a base for the plug and a wireless remote control. The operating range of the device is 25 meters, the device is connected to a regular outlet.

Advantages

With the help of a controlled outlet you can really make life more comfortable. The advantages of these modern devices include:

programming ability, for example, you can set the time to open windows at the same time if they are automated;
quickly connect to the electrical network;
instant signal reception;
universal sockets;
automatically reboot if the program crashes.

Flaws

What are the disadvantages of sockets?

If the device is radio-controlled, it may cause false alarms.
Affects the operation of medical equipment, including pacemakers.
High price for Wi-Fi models.

Wi-Fi devices operate on the principle of a wireless computer mouse. The socket, which is controlled by a remote control, is ideal for modern premises that support an automation system.

Socket with remote control

A wireless socket with a remote control is a necessary element of a modern home. With its help, the processes of turning on and off household appliances and equipment are automated. This outlet is controlled using a remote control. Some manufacturers produce several models of sockets for one remote control. The peculiarity is that control over objects is carried out in a large office, workshop, house, apartment.

The standard kit includes a wireless electrical outlet, a remote control and batteries for it. Each such outlet has a ground connection. It operates on AC voltage, but the device is compact in size. The range is forty meters, and devices connected to a wireless outlet should not exceed a power of 4 kW. The signal penetrates through the walls. The device starts working after connecting the wireless device to a regular connector.

Wireless Wi-Fi socket

With this connection it is easy to control any modern devices. The electrical outlet is no exception. The main advantage of Wi-Fi sockets is that the user can control its operation via the Internet using a tablet, laptop or smartphone. Such devices are equipped with a timer, which is configured in a mobile application. To connect the outlet, you will need drivers. They are loaded from the installation disk or downloaded from the Internet. Install a special application on your smartphone or tablet, connect the outlet to Wi-Fi, go to the menu via your smartphone, and establish a connection.

The main disadvantage of the device is its high cost and modest functionality. Almost all models of such devices cannot provide information about air temperature, transmit and receive information about voltage, load and other data. Some models have the ability to control the air temperature in the room, a timer, control of sockets from several devices, an autonomous power supply, and notification of emergency situations.

The plug connector for connecting various devices to the electrical network is known to everyone, but it is not always convenient to use. Therefore, let's consider such an interesting thing as sockets controlled by remote control. We'll tell you how they differ from conventional connectors, and when you should choose them.

Today's complex household appliances almost always have their own remote control systems, but the simplest appliances are not equipped with them. In addition, standard remote controls are not always convenient. An outlet that can be turned on and off from a distance is useful in the following situations.

If access to the outlet installation site is difficult, this is very common today. For example, they installed a cabinet that covers it, but there is no other one nearby. Of course, you can install an additional connector, but this requires repairing the wall decoration after installing the wiring. Also, in rented premises, any work to change communications must almost always be coordinated with the owner.

In addition, a hidden outlet is sometimes a big plus - if it is visible, it may not fit into the interior. For example, in historical buildings (or you want your house to look old), where the atmosphere of an era not familiar with electricity is recreated.

Therefore, it is easier to hide an outlet behind a cassone, chest of drawers, desk or wardrobe and control it remotely than to put an object of modern design on display in an apartment built before Columbus discovered America (as in the photo below).

For connecting simple heating devices - air convectors, oil radiators. If the house gets too hot, you can simply turn off the heating in one motion, without getting up from the couch.

If you use communication channels (more on this below) that can operate over a long distance, it is possible to turn on a volumetric water heater and other devices at a great distance from the house. We leave work, turn on the boiler and heating - a warm house and a shower are ready upon arrival.

For particularly suspicious people, remote control (also with a large range) is a huge plus - alarms about whether the iron or kettle has been turned off can be eliminated by remotely turning off the socket.

In addition, remote control increases the service life of both the devices themselves and the sockets. Simply pulling the plug loosens the sockets and burns the contacts, but the electronic control (especially if the remote socket contains triacs rather than relays) is almost eternal.

What is a socket with a remote control?

If a regular socket includes only a housing, contacts (usually three or four, depending on whether single-phase or three-phase connection of devices is provided, and whether there is a grounding or neutral wire), as well as additional parts for fasteners and, possibly, decorative elements, then The remote-controlled socket has two additional blocks:

switching unit for supplying current to the connectors;
receiver block - receives signals from the remote control and commands switching.

How to control sockets with remote control

There are several ways to communicate between the receiver and the remote control. We list them, describing their advantages and disadvantages.

Mechanical control

Something like “Little Red Riding Hood, pull the string on the door and it will open.” This can even include simply pulling the plug by the cord (I don’t recommend it, it’s dangerous).

Because of its primitiveness, we won’t even consider it. Although it should be noted that the first TV remote controls used exactly this method.

Via wired channel

One of the most reliable channels, absolutely protected from interference. Many short-range missiles and torpedoes are controlled by wire, but for a socket this is not remote control (we get additional wires to control the wires). Therefore, we don’t consider it either.

Acoustic control

The method is not the best, since it is very afraid of interference, and speech and music can be a source of false positives. Even if you filter the sound, there may still be errors (on smartphones, the “OK, Google” command sometimes turns on by itself during a conversation).

Interesting. The first TV remotes also used this principle. The Zenit Commander console had a set of metal plates that, when a key was pressed (like a piano), emitted infrasound of a certain frequency. The receiver responded to it. The remote control itself lasted forever, no batteries.

We will not develop this topic in detail either, so as not to move away from outlets, but perhaps it is worth addressing it seriously for two reasons.

To control staircase lighting, this is the best option, since acoustic control saves energy. That is, even if the sensor does not respond to the sound of a door opening and footsteps, you can turn on the lighting with your voice or the clap of your palms.
Why we turned in more detail to the design of this channel - the fact is that staircase lighting is general communications, and their operation is carried out by the housing and communal services or another similar structure. An ordinary tenant does not have the right to make changes. But if it’s dark, then no one bothers you to install an adapter with a remote control into the socket, which responds to sounds, and connect an additional lamp to it. In this case, you do not touch the wiring.

IR channel

The outlet is controlled using invisible infrared radiation. Most remote control systems for household appliances (TVs, stereo systems, air conditioners) operate on this principle. The IR control system is simple and has a rich element base.

In some cases, when assembling such an outlet yourself, you can not even make a remote control, but adapt a purchased universal one or a remote control from other electrical equipment.

But there are also disadvantages:

Control is possible only with direct visibility (in some cases it is possible to trigger the sensor by radiation reflected from the walls). It is impossible to turn on the socket at a great distance or from the next room with the doors closed.
False alarms are possible from light sources whose spectrum also includes the IR region (for example, a socket with an infrared remote control can be triggered by a flash of lightning) or from a command from a third-party remote control.

Radio channel

One of the oldest (not counting wired) methods of remote control. Allows you to turn on the device (with sufficient sensitivity of the receiver and transmitter power) not only at a distance, but also from several kilometers away.

However, the range is still limited. The simplest circuits of such devices can be sensitive to interference, so it is advisable to implement a signal encryption system.

Note that Wi-Fi and Bluetooth receivers and transmitters are often used. This approach allows you to control the outlet not only using a separate remote control, but also to issue commands using a mobile phone or tablet.

GSM channel

In principle, it is the same as a radio channel, but this control is more convenient, since you can control the outlet from anywhere in the world where there is cellular network coverage. To simplify assembly, either special modules or cheap (old) mobile phones are used as receivers.

For example, while in another city, using such an outlet you can turn on the heating in the house or the aerator for the aquarium. There is only one drawback - you need to pay the telecom operator for using the SIM card.

Several diagrams for self-assembly

Now let's look at several diagrams for assembling a socket with a remote control with your own hands, which were found on the network. Let’s not hide that these circuits are generally suitable for many other devices for controlling electrical equipment at a distance, so we will try to select the most interesting ones that require different levels of skill.

Moreover, we chose the first two schemes with radio control, since sockets with IR control, despite the fact that they are much cheaper, will not save you from the problem of a “burning iron” - you left the house and forgot whether you turned off the electrical appliance.

On ready-made modules

The easiest way to assemble a remote-controlled socket is in just a couple of hours using a set of ready-made modules from the Master Kit company, which can be easily purchased on the Internet. The device has pretty good characteristics - switched load up to 2 kW and 10A, range up to 50 meters. Although we will say that the cost is low (you will have to pay about 2 thousand rubles for all the blocks), you can assemble it yourself for less.

We will need:

receiver module with switching device MP912;
Power supply for it(you can assemble it yourself, but it’s better to buy it in pairs, especially since there’s a discount on the set) WP1245;
MP910 remote control.

The price for everything, if you purchase a receiver and power supply, is approximately the same as for ready-made sockets with radio remote control, but, nevertheless, it will be done with your own hands.

Assembly does not require any special knowledge of radio engineering, the main thing is to be able to read circuit diagrams and hold a soldering iron and wire cutters in your hands. Here is a diagram of connecting the receiver and power supply.

The socket can be assembled in several versions:

like a regular overhead (you will have to find additional volume in the case, for example, by removing the switch in a socket with a switch);
as built into the wall (in this case, additional volume for electronics can be found in the volume of the wall, not forgetting about cooling the elements);
as an adapter for a socket;
like an extension cord or splitter.

On the receiver board, with a drop of solder, we bridge two “patches” to select the signal encoding option (as in the photo below, shown by the red circle).

Having disassembled the transmitter, we close the spots on its board in the same way, then assemble the case again.
We connect the receiver to the power supply.
We connect the power supply and the receiver relay to a 220 volt network (if the socket is built-in, then directly or through a switch, if it is made as an adapter or extension cord, then to a cord or plug).
We are testing the design - when you press the transmitter buttons, you should hear clicks from the receiver relay.
We install the receiver with the power supply into the case.

Scheme without using ready-made modules

The following circuit is assembled from scratch, and is intended for more experienced radio amateurs. A huge plus is that it works at a distance of up to five kilometers.

If you live close to your place of work (for example, in a small village), then having a remote control with you, you can turn on and off any device in the house. In addition, by making small changes, you can increase the number of channels and control not just one outlet, but several.

Note that it is also interesting because it is done without ready-made modules (unless we consider microcircuits as such), and this is of interest to many craftsmen. The cost of all components is about a thousand rubles. However, all the parts are very common and can be removed from old devices.

To make it easier to assemble devices, we provide not only circuit diagrams, but also drawings of printed circuit boards.

Attention. The printed circuit board design is designed for small-sized parts - resistors and capacitors (except for microcircuits, of course). Therefore, if some element does not fit, it can be adjusted; it is not difficult, but the size may increase

The receiver circuit works as follows:

A receiving circuit tuned to the operating frequency (27.12 MHz is the permitted range for such devices) is assembled on coil L1 and capacitors C1 and C2. Diode VD 1 suppresses excess signal if the transmitter is nearby.
A high-frequency amplifier is assembled on transistor VT 1. A field-effect transistor was chosen due to its high sensitivity.
The DA 1 chip contains a local oscillator, the signal of which is mixed with the signal of the high-frequency amplifier. For stable operation of the local oscillator, its frequency of 26.655 MHz is set by the quartz resonator Q 1.
The intermediate frequency signal of 465 kHz is filtered through resonator Q 2. Installing a resonator instead of a conventional LC filter provides high selectivity of the receiver.
Then the intermediate frequency signal is fed to an amplifier, which is assembled on part of the DA 2 microcircuit. The microcircuit also includes an automatic signal level controller, a detector and a low frequency amplifier (LF). To adjust the signal at the ULF input, a trim resistor is installed between pins 9 and 8.
From the output of the low-frequency amplifier, a signal is sent to an amplifier assembled on transistor VT 2 and a reflex cascade on coil L2 and capacitor C 19.
The reflex cascade is set to a frequency of 1.25 kHz. The appearance of a low frequency of exactly this value leads to resonance and a constant voltage appears at the cathode of the diode VD 2. It opens the transistor VT 2, the collector circuit of which includes a relay XC, which controls the supply of current to the socket connectors.

Here are the winding data of the coils and the markings of elements that are not indicated in the diagram:

Coil L 1 is wound on a ferrite rod with a diameter of 2.8 millimeters and a length of 1.2 centimeters. Winding wire with a cross-section of 0.31 millimeters. The number of turns is 14. The coil is wound in such a way that it can be moved along the core for adjustment.
The L 2 coil is wound on a 400NN ferrite ring with dimensions K7-4-2. It contains 350 turns of wire with a cross section of 0.06 millimeters.
Piezoceramic filter FGLP 061-02, although any other can be used, the main thing is that the frequency matches.
Relay type RES-55, but you can also use RES-43 or 44 or any other. If it is necessary to switch a load of more than 0.25 amperes, then we additionally install a contactor, the winding of which will be controlled by the relay, and it, in turn, will control the load.

Interesting to know. The diagram shows a battery as a power source. For a socket receiver, this approach is nonsense, so it is better to use a power supply from the network (there are many circuits, including a transformerless one, as in the image below). However, today it is much easier and cheaper to buy a ready-made power supply (for example, the same as for the previous device) or use the filling of a damaged (frayed cable) charging unit for electronic devices.

It is a little simpler than the receiver, like all transmitters, designed to work with one receiver and at one frequency.

It works as follows:

Transistor VT 1 operates in the carrier frequency generator— it is stabilized by a quartz resonator Q 1 at 27.12 MHz. The signal is isolated on inductor L 1, after which it is supplied to the power amplifier through capacitor C8 (to eliminate the influence of subsequent circuits and additional filtering of the signal).
A high-frequency amplifier (UHF) is assembled on transistor VT 2 raising the generator signal to the required supply level to the antenna.
To match with the antenna and remove unwanted harmonics, a multi-stage adjustable filter is used on coils L 4, L 5, L 6 and capacitors C 13, C 14, C 15. After this, a simple whip antenna is connected through capacitor C 17. For maximum sensitivity of the system, its dyne should be more than half a meter, that is, all telescopic options from any radio receivers are suitable.
Transistor VT 3, whose emitter-collector junction is included in the collector circuit VT 2, on which the UHF is assembled, is intended for amplitude modulation. The more it is open, the higher the carrier frequency signal level.
To trigger the receiver relay, it is necessary that after detecting a radio signal, a low frequency signal of 1.25 kHz must be selected, it is produced by a multivibrator based on the “or-not” logic elements D1.1, D1.2 of the simplest digital microcircuit of type LE 5. The frequency is set by the values of resistors R1 and R2, as well as capacitor C3.
The signal is supplied to the modulator through chain D1.3, D1.4, which is controlled by switch S 1. If it is open, then the radio signal is modulated with the required frequency and the receiver relay is turned on, the socket powers the consumer, if it is closed, then there is no power.

Now we present the names and values of elements that are not indicated on the circuit diagram, as well as possible replacements with analogues:

Quartz resonator Q 1 - any, designed for a frequency of 27.12 MHz.
Coils L 1, L 2, L 3 are wound using MLT 0.5 resistors with a nominal value of at least 100 kOhm as a core. They contain 40 turns of wire, with a cross-section of 0.16 millimeters.
Coil L 4 and L 5 without core. Their diameter is 7 millimeters, length ten. The first contains 15 turns of wire with a cross-section of 0.61 millimeters, the second 20 turns with a cross-section of 0.56.
Coil L 6 is wound in the same way as on the input circuit of the receiver, on a ferrite rod with a diameter of 2.8 millimeters and a length of 12. It contains 18 turns of wire with a cross-section of 0.2 millimeters and must move freely along the core.
The 176-series microcircuit can be replaced with exactly the same (LA7) 561-series or even 564-series (but in the latter case you will need to slightly change the board layout). Moreover, if the marking does not have the letter “K” in front of the series number, it will be even better, due to the fact that the batch from which this microcircuit is from is not for general use, but special - for military products, and therefore more reliable.
The KT 608 transistor can have any letter index (this also applies to other transistors),
Analogs applicable in our circuit to replace the KT 608 transistor are KT 606 and KT 907.
The VT 3 transistor can be not only KT 814, but also KT 816 and even the old germanium GT 403.

Now about setting up the receiver and transmitter of the socket. First of all, we deal with the transmitter:

Using a high-frequency oscilloscope with modulation turned off, we achieve the maximum signal at the output to the antenna. We do this by compressing and unclenching the turns of coils L 4 and L 5 and adjusting the construction capacitor C 13.

Then, by connecting the antenna, we achieve the same thing 1 meter from the transmitter, changing the position of the L 6 coil on the core.

Attention. When setting up, the main thing is not to mistakenly measure one of the signal harmonics, its level is lower.

Now turn on the modulation using switch S 1. The sine wave will vary in level. By changing the sweep time of the oscilloscope, we should see a square wave.

Having configured the transmitter, we fix the positions of the turns of coils L 4 and L 5, as well as the position of coil L 6 on the core with epoxy resin or glue.

Then we take on the receiver:

We turn on our transmitter.
By moving coil L 1 along the core, we achieve the maximum signal level at the output of the high-frequency amplifier on transistor VT 1.
After this, using the construction resistor R 8, we achieve clear operation of the relay when the modulation of the transmitter is turned on at a distance. Additionally, you can adjust the frequency of the low-frequency generator on the transmitter using a construction resistor R 2 in its circuit.

After we have assembled and adjusted the electronic part, all that remains is to mount it in any convenient housing, just like the previous version of the design. You can also upgrade this circuit and use a receiver and transmitter to control several outlets (channels).

To do this you need to make the following changes:

Connect to point “A” in the receiver (after capacitor C 18) several more nodes completely similar to the node on transistor VT 3, except for the capacitance of capacitor C 19, the relay of each such node will control its own channel. We select capacitors, for example, with capacities of 0.15 μF, 0.1 μF and 0.68 μF.
In the transmitter you need to use several parallel construction resistors R2 (each for its own channel) switched by a switch.
When setting up, we set the frequencies with additional trimmed resistors to trigger each channel in accordance with the position of the switch.

Control via GSM channel

Let's also give a diagram of a remotely controlled socket controlled via GSM. In this case, we will use any phone as a receiver (an old one with a broken case, etc.), the main thing is that it receives the signal.

The transmitter is also, of course, a cell phone. We liked it because it does not require disassembling the mobile phone, like most other options that connect to the phone’s vibration motor, and can support several channels.

Working with this device is simple. We will not analyze this scheme in great detail, since if you have enough experience in assembling the previous one, then you can handle this one without any problems.

Such an outlet is controlled from a mobile phone instead of a remote control. Everything is very simple:

We dial our receiver phone number.
After the connection has occurred, use the telephone keys “1” - “7” to change the state of the sockets connected to the corresponding relay (channel). You can turn off all sockets by pressing “0”.

The principle is based on the fact that after connection the phone switches to tone-DTFM dialing mode. It is recognized by an additional unit, which is connected by connector X 1 to the phone’s headphone jack (usually a 3.5 mm mini jack). Having accepted the command, he turns the relay on and off, and it turns the load on the socket. Here is a diagram of this block.

The main part of the circuit is a large integrated circuit KR1008VZh18, which is a DTFM decoder and developed for digital telephone exchanges back in the days of the Soviet Union, costs a little more than a hundred rubles.

The block works as follows:

The signal from the telephone output, capacitor C 1 (to decouple the circuitry of the device and the telephone) and the voltage divider across resistors R 2, R 3 is supplied to the input of the decoder. The gain depends on the ratio of the resistances of resistors R 2 and R 3.
For stable operation of the decoder clock generator, a Q 1 quartz resonator is installed.
Having recognized the signal at outputs 11, 12, 13 of the decoder, its three-digit binary code is set. Moreover, it is preserved even in the absence of a signal (when the button on the transmitter phone has already been released).
This code is deciphered into decimal by the D 1 chip, and voltage appears at its corresponding outputs (in principle, the number of channels can be increased to nine).
The signal from outputs D 1 opens the corresponding transistor switches, which supply voltage to the relay windings K1 - K7, and they, in turn, supply voltage to the sockets.

To make assembly easier, here is a drawing of the printed circuit board.

Attention. There is one jumper wire on the board, and the outputs of the D 1 chip with transient switches are connected by a wire harness.

We will be glad if our article helped you understand what a remotely controlled socket is intended for and the principles of its operation. If you were still able to assemble several designs with the help of our descriptions, then the time spent on writing it was not wasted. Let your home be beautiful and comfortable, including thanks to remote control sockets.