Quite often, in various schemes, voltage converters are required. The most typical example is powering a device from a car battery. Typically, such voltage converters are push-pull based on various specialized microcircuits. But, if the power of the converter is small, it is quite possible to create one on the basis of the 555 timer (KR1006VI1). A diagram of one of the possible options is shown in the figure.

The circuit contains a self-oscillating multivibrator already familiar from previous articles about the 555 timer, the output of which is connected to a gate of a powerful field-effect transistor. The stabilization device is a threshold device, almost a comparator, with a threshold threshold set by the zener diode. The stabilization device works as follows ...

Power supply of country houses has a number of distinctive features. The main one is the need to connect to the overhead line (VL). The burden of arranging this connection is usually the responsibility of the owner of the house, and the point of connection between the power supply organization and the homeowner is the point of connection to the overhead line.

When the branch device is installed, additional installation of one or several supports may be necessary if the distance from the entry point into the house to the overhead line is more than 25 meters. The input itself should be located at a height of at least 2.75 meters, and the wall passage should be made in accordance with fire safety requirements. We are talking about the presence in the wall of a mortgage tube made of non-combustible material, as well as the compliance of the lead wire cross section with the maximum permissible load, taking into account the stock. It is best to use SIP as an input conductor, although the use of VVG or bare wires is not excluded ...

For an effective sale of products and services, firms have long since “invented” a trouble-free method - exposure of customers to light advertising. Until recently, neon signs dominated advertising. But recent decades have gradually changed this situation: promotional items from luminous cords, or duralight, have spread.

Duralight quickly gained popularity for performing outdoor advertising of shops, contour lighting of bridges, architectural ensembles, and even decorative lighting of residential premises. Often used in the interior decoration of shopping centers, bars, restaurants. It looks very effective as a decoration of Christmas trees on New Year's holidays.

Structurally, duralight is made in the form of a flexible transparent polyvinyl chloride (PVC) cord of rectangular or circular cross section. Inside are miniature light sources: incandescent lamps or LEDs ...

Programmable Logic Controllers (PLCs) - a magical combination of terms for the uninitiated and a mundane reality for professionals. This material is for those who are just interested in the possibility of using them for home automation.

Let's start over, or from the “stove”. In not so distant times, electrical engineers designed their equipment based on existing discrete devices manufactured by industry. These are relays, timers, engine control buttons and a small list of devices that were available in a power that had vanished into the past.

Several decades passed, and the practice of working with individual electrical components almost stopped - the market was filled with universal devices that can perform any control and monitoring functions - PLCs. In order to understand the features and capabilities ...

From a burnt compact fluorescent lamp, you can make a replacement for it and at the same time it will be almost eternal. I will tell you how to do it.

Assembly: The burnt-out compact fluorescent lamp must be carefully disassembled and the new circuit soldered by hinged mounting directly inside the base. Leave the fuse that was in the lamp. Diodes 1N4007 are extracted from the board of the same lamp. To them we add a capacitor 1mkf 630 volt K73-17 and one electrolyte. The electrolyte is suitable for almost any voltage of 50 volts or higher, well, and with a capacity of more than 100 microfarads. Still need 4 pieces of LED strip. As a rule, the tape is produced so that it can be divided into pieces of 12 volts.

In this case, on one such piece 3 LEDs. Cut 4 pieces of 3 LEDs and turn them on sequentially. So that the parts do not hang out, inside the cap they can be glued with any glue ...

When we hear the phrase “old wiring”, a very specific image pops up in our memory: two thin aluminum wires in common single-layer insulation with a wide and flat separation gap. Since the insulation is common, the phase and zero conductors, of course, do not differ in color. What brand did that ever-memorable cable have? And it’s hard to remember, although it is still on sale today. Of course, we do not recommend using it.

Today, we can rightfully say that aluminum in household wiring has already outlived its own. This is confirmed by the rules of the PUE prohibiting the installation of aluminum conductors with a cross section of less than 16 square meters. mm But even without these norms, it has long been known that aluminum wires always form a film of non-conductive oxide on their surface, which often causes overheating of contacts. The mechanical properties of aluminum from overheating become even worse ...

With the modern development of electronics in China, it seems that you can buy anything you want: from home theaters and computers to simple products such as electrical outlets and plugs.

Somewhere between them are all kinds of timers, flashing Christmas lights, clocks with thermometers, power controllers, temperature controllers, photorelay and much more. As the great satirist Arkady Raikin said in a monologue about the deficit: “Let everything be, but let something be missing!” In general, just what is included in the “repertoire” of simple amateur radio designs is missing. Despite such competition from the Chinese industry, the interest of amateur designers in these simple designs has not been lost so far. They continue to be developed and in some cases find worthy application in small home automation devices ...

From a long list of fantastic technical ideas realized today, only the dream of wireless transmission of electrical energy continues to remain unassailable. Detailed descriptions of energy rays in science fiction novels tease engineers with their obvious need, and at the same time the practical impossibility of implementation. But the situation is gradually changing for the better. From the very beginning of the discovery of electricity, there was a problem of its transmission to the final consumer.

The development of industrial production has led to a sharp increase in demand for electricity. Wires and poles of electric transmission lines have become an integral element of landscapes. But only specialists know how much money and effort is spent on maintaining these lines in working condition, and how much energy is lost in them. Fossil resources are gradually running out ...

After a shaft of optimistic forecasts about the imminent crowding out of incandescent LEDs, there was a lull. The first samples of LED lamps did not cause delight, but rather bewilderment. Are these pathetic, blinding eyes light sources called upon to replace the usual light bulbs with a filament?

Let's try to answer this, and several other questions. The advent of blue LEDs in 1998 paved the way for solid-state white light sources. After that, the scope of LEDs began to expand rapidly: from the traditional illumination of dashboards to the replacement of fluorescent lamps in televisions and monitors with LCD panels. But the impressive progress of semiconductor sources has not affected household lighting. According to one version, LED lamps are too expensive, so they are not popular with buyers ...

Overhaul in an apartment is a natural disaster that is familiar to many of our fellow citizens. What is included in the mandatory program of this event?

Removing furniture with partial rejection, removing the old floor covering and, possibly, the floor itself, peeling old wallpaper, dismantling old plumbing, interior doors ... And this is just the beginning. Next on the schedule is the replacement of the risers of heating, domestic hot water, cold water and sewage, work to align the walls, floor and ceiling, replacing doors and windows, installing new coatings for the same walls, floor and ceiling.

In general, plenty of work. And the older the apartment, the more problems you will have to face. But we did not mention one important point, which is most rational to coincide with the general overhaul of the apartment. It is about replacing the old worn electrical wiring. The need to replace wiring is dictated by ...

The article provides a real-world example of the refinement of a cheap extension cord by amplifying electrical contacts and replacing a wire. The result is a good and reliable extension cord, in no way inferior to expensive analogues.

Currently, more and more portable electric appliances and tools are being produced. For them, often for work, extension cords are required. And there are plenty of this product in today's market: from cheap to expensive. Extension cords, which are more expensive, can meet all the necessary requirements, but which are unlikely to be cheaper. But once they are, then naturally the people also buy them. Maybe because they don’t know which ones are better, which are worse, or maybe for financial reasons. And once having bought a cheap product, it ceases to work normally, namely, as they say - "phase, that is, it is not there." The main reason that a cheap extension cord does not work well is poor contact ...

Once, just some twenty years ago, almost all electronic equipment, both domestic and industrial, was domestically produced. Accordingly, the entire elemental base - transistors, microcircuits, diodes, resistors, was used domestic.

To understand this, albeit not very large by modern standards, reference books were issued. This literature was so scarce that, in current terms, it should be called a bestseller: in bookstores, all literature on electronics was sold out instantly. The purchasers of these books were mainly radio amateurs and repair engineers.

Currently, all electronics are developed and manufactured abroad, so the entire elemental base is also “from there”. This is noticeable already at the stage of acquiring radio components on radio markets and in online stores. If you are looking for, for example, KR1006VI1, then helpful sellers will certainly offer ...