When repairing electrical wiring, it is always necessary to have access to the ends of the connecting cables and the contacts of sockets, switches. In modern buildings, a hidden method of installing communications is often used, when all wires are hidden inside the walls for security and design purposes.

To the veins of the cable ends can be reached only at the entrance of the lamp, switch, socket and electrical distribution box. For the convenience of servicing such electrical equipment, certain rules must be taken into account: cables are laid along certain routes provided by the project, in the places where sockets and switches are installed inside the wall, recesses are made to accommodate the corresponding equipment, installation boxes are mounted inside the recesses into which the switches and sockets are mounted. The most favorable time for such work ...

I present an overview of the popular SkyRC iMax B6 mini charging. The instruction is in English only. The device itself is wrapped in a soft bag. Cables included. A warning tag is pasted on the screen stating that if something went wrong - they are to blame, there was nothing left unattended :)

The initial version of firmware is V1.10. The firmware was updated on V1.12 - it added the ability to charge lithium without balancing, which can sometimes be useful, and sometimes dangerous. It was not possible to flash under Win8.1 - it was flashing under Wn7 with language switching to English. As it turned out later, it was necessary to run the program on behalf of the Administrator. Under WinXP, the program refused to start. How to work with this charge has been written many times in other reviews (links below) and it makes no sense to repeat it, inflating the review, so I will try to tell only new information ...

The strongest, most powerful permanent magnet available on the market today are neodymium magnets. They have the chemical formula Nd2Fe14B, and have an exceptional magnetic energy density of up to 512 kJ / m3. If earlier samarium-cobalt (SmCo) magnets were considered the most powerful ones available, then, starting in 1986, they were gradually replaced by neodymium magnets, much more economical in cost of production, albeit with a lower Curie temperature.

With the development of the electronics industry, from the 90s to the present, neodymium magnets have gained great popularity everywhere, and many are still surprised by their remarkable properties, because such a magnet can lift a load thousands of times the weight of the magnet itself. It all started with the fact that in 1982 the Japanese company Sumitomo Special Metals, working together with the American General Motors on the search problem ...

When purchasing a motion sensor to turn on the light, do not take the first one you get. To begin with, it is necessary to determine some significant parameters, the conditions for its future use, and, depending on them, choose a sensor with suitable technical characteristics.

There are four main parameters, taking into account which you will not lose and will not be disappointed; Here are these parameters: environmental conditions, the power of the switched equipment, the characteristics of the response zone (the required viewing angle and the radius of the sensor), the requirements for the sensor response time and the adjustment of the light level.

For different environmental conditions, sensors with various degrees (classes) of protection are provided.The protection class shows how resistant the sensor is to dust, other physical influences ...

Apartment owners are sometimes faced with the need to repair the doorbell or install its new model. To do this, they need to clearly know the electrical circuit of its connection and the principle of operation.

The calls by which the guest warns the owner of his arrival are divided into wired and wireless.

Such designs are the most common and known. Among them, first appeared electromechanical models, which began to be installed on the homes of noble people from the second half of the 18th century. They continue to work with small improvements to this day.

After the start of industrial development of semiconductor elements, doorbells began to be issued on an electronic circuit. They have the same type of bell ringing replaced by more diverse ...

The choice of welding household appliances is huge. In this article I will talk about the Resant 250 inverter type welding machine, why this particular model is what is good and what is not. I do not regret the choice made, I can say about it right away. In the kit, as a gift, a welder helmet, bought electrodes separately.

Advantages of the welding machine. The range of currents and applicable electrode diameters (up to 5 mm) allows you to perform welding work at a professional level (with the exception of volumes, since there are limitations in continuous operation). Good protection, smooth adjustment, low weight and competent layout of the connections allows you to work in hard to reach places. Excellent cable insulation, very rigid holder springs and negative terminals, reliable cooling, the ability to work at sub-zero temperatures (minus 8 - no problem) ...

Children's lamps, in addition to their intended purpose, are able to play the role of an important element of decor and harmoniously complement the most unusual composition in the room of a mischievous little boy or little princess.

What to look for when choosing children's lamps? A product purchased for small users should be, above all, of high quality. Considering safety, it is better to give preference to models in which the ceiling, which is securely fixed to the base of the device, is made of impact-resistant materials that will not break when dropped.

A table lamp should fully illuminate the work surface, without taking up much space. Please note that the light from her does not hit the child in the eye, but gently scatters down. Sharp and traumatic corners and surfaces, overly fragile parts and unreliable fastening mechanisms are not allowed in children's fixtures ...

Today, solar panels based on silicon alone are far from the finale on the path to curbing the energy of sunlight and converting it into usable electrical energy. Many works are still being carried out by scientists, and in this article we will consider five unusual solutions that some of the modern researchers are developing.

In the American National Laboratory of Renewable Energy Sources (NREL), a solar battery based on semiconductor crystals, the sizes of which do not exceed several nanometers, is built up, these are the so-called quantum dots. The sample is already a champion in terms of external and internal quantum efficiency, which amounted to 114% and 130%, respectively. These characteristics show the ratio of the number of generated electron-hole pairs to the number of photons incident on the sample and the ratio of the number of generated electrons...