What is so sorely lacking at the right time for a person who keeps up with progress and keeps track of all the technical innovations? Of course sockets.

According to the law of meanness known to all of us, the sockets in our apartments are for the most part located in the most uncomfortable way, which creates a lot of problems for us, but conducting new ones is quite expensive, and extension cords are constantly breaking and terribly interfering. There is no question of convenience and comfort in such situations, but now it is no longer a problem. The inquiring mind of a person is in constant creative search, trying to make life easier for his master.

Another such “relief” this time was a hybrid of an ordinary outlet and the same ordinary extension cord ...

To conduct water supply and sewerage, to make open-air cages for pets and birds, beautiful flower stands and many other things useful in the household, a welding machine made of available parts and materials will help you. With electrodes up to 4 mm in diameter, they can weld metal with a thickness of 1 - 20 mm. The home-made welding machine operates on AC 220 or 380 V.

Its basis is a three-phase step-down transformer 380/36 V, power 1 - 2 kW, designed to supply low voltage power tools. Even a copy with one burned-out winding is suitable.

Without disassembling the core, remove the secondary windings from all the coils by biting the copper bus in several places. Do not touch the primary windings of the extreme coils, and rewind the middle one with the same wire, making bends every 30 turns ...

If you live in a house that was built 10-15 years ago, then you probably have already touched on the problems that arise with electrical wiring.

To begin with, at that time our life was not saturated with such a large number of household appliances that consume electricity. Accordingly, the wiring in old houses was done based on a small electricity consumption.

Mostly the electrical wiring was laid by builders using aluminum wires and, often, without grounding. Our time makes higher demands on wiring. But not every landlord understands that it is quite easy to change the electrical wiring in a single room or in the apartment by yourself and it is not at all necessary to contact electricians.

Advantages of self-replacement of wiring: when shutting down the walls of hired workers, they are not at all interested in how well you covered the furniture from dust, whether you moved things to a place inaccessible to dirt - they usually work “all along the front”, and dust and dirt happen many. With independent work, you plan your activity yourself, if necessary, you can even take out all things from any room ...

In a dark room, the light switch always has to be looked for by touch. This task is facilitated by the “firefly” installed on its decorative panel - a luminous neon bulb or LED.

Connect a neon bulb or LED of the AL102, AL307, KL101 and other series in series with a resistor of 100 - 500 kOhm or 100 - 200 kOhm to the terminals of the wall switch. Instead of a neon lamp, you can use a starter for a fluorescent lamp.

In the history of domestic electrical engineering, the year 1893 was marked by two unrelated events.At this time, one of the world's first Electrotechnical Institute in St. Petersburg was founded and the power station at the Novorossiysk elevator was put into operation. It so happened that a year later the head of the department of electrical engineering of this institute M.A.Shatelen completely accidentally ended up in Novorossiysk and visited the elevator. He left here, shocked by what he saw. What struck the metropolitan professor?

It was difficult to surprise the most important specialist in electrical engineering in Russia. He himself was a physicist with an electrical specialization in 1888-1889, he improved his knowledge in France (the birthplace of Coulomb and Ampere) and, having a degree, went from working to chef in the company of Edison, the creator of the world's first district power station.

A little later in the journal "Electricity" No. 19-20 for 1895. his article appeared, where one could read the following: “Stations like Novorossiysk are of great importance in the spread of the use of electricity. When engineers and technicians see such stations, they can make sure that the use of electricity in power transmission is a very simple matter and they can defeat their prejudice against it. ”

The professor had too little time to get acquainted with the station and he himself could not prepare a full-fledged article, and this ended with the words: “It would be nice if the station organizer published details of its construction and operation.” What reasons prevented the appearance of such an article in the journal at that time is unknown. But she still appeared, though in 1953.

The modern reader will probably be completely perplexed about the prejudices regarding electricity in those not so distant times. But that is exactly so. The average person did not always even want the introduction of electric light, considering it too bright and harmful to health. Among the specialists introducing this lighting, there was an irreconcilable confrontation on the power supply system of installations - direct or alternating current. This enmity has crossed all borders of industry competition, which is known to be the engine of progress ...

At home, we often have to work with electric tools and devices (electric drills, rotary hammers, circular saws, electric planers, etc.) at a considerable distance from the outlet. And if the extension cord has a long length (more than 25 m), it becomes difficult to unwind, wind and store it. Therefore, we decided to make a portable extension cord (see. Fig.).

The extension cord consists of a base, a pillar, and a wire-mounted reel. A plug connector is connected to one end thereof, and a plug to the other. The bobbin is mounted on the axis with the help of curly washers and is locked with the wing nut.

The stand consists of a pipe curved in the form of a bracket 1 / 2–3 / 4" and two corners welded to it. In turn, the axis on which the bobbin with the wire is mounted is welded to the top ...

The name of Oleg Vladimirovich Losev today is known only to a narrow circle of specialists. What a pity: his contribution to science, to the development of radio engineering is such that it entitles this ascetic scientist to the grateful memory of his descendants.

Pupil of the fifth grade of the real school of the pre-revolutionary Tver Oleg Losev that quietly rummaged for an evening in his half-secret home radio laboratory, which he equipped with money saved from school breakfasts, and made another electric squeaker. And no one could have thought that in a modest polite boy who stood out among classmates with a deep understanding of physics, a love of experimentation, the personality of a purposeful researcher is formed.

It all started with a public lecture on wireless telegraphy, as they called radio at that time, which was delivered by the head of the Tver radio receiving station B. M. Leshchinsky.At fourteen, Oleg Losev makes the final choice: his calling is radio engineering ...

Typically, electric motors are divided into three groups: large, medium and low power. For low power engines (we will call them micromotors), the upper limit of the power is not set, usually a few hundred watts. Micromotors are widely used in household appliances and devices (now every family has several micromotors - in refrigerators, vacuum cleaners, tape recorders, players, etc.), measuring equipment, automatic control systems, aviation and space technology, and other areas of human activity.

Single-phase asynchronous micromotors are the most common type, they satisfy the requirements of most electric drives of devices and apparatuses, differing in low cost and noise level, high reliability, do not require maintenance and do not contain moving contacts ...