You go into the room, turn on the switch, but the chandelier does not light up, even though the lamps are intact and in place. Before buying a new chandelier, you need to check everything, maybe the switch does not work or the contact has oxidized somewhere.

When troubleshooting, it should be remembered: in Soviet times, wiring was often done so that the switch interrupted the neutral wire, according to modern requirements, the switch must necessarily break the phase wire. Therefore, today in the apartments there are both options, which can cause additional difficulties.

For example, take a chandelier with two groups of lamps, each of which is turned on by its own switch button. If all the lamps do not work, therefore, a malfunction should be sought in the general part of the circuit for both groups of lamps. And this is the section from the box to the switch ...

Many of those who turned electronics into an entertaining pastime often ask themselves the question: “Why am I doing this?” I read magazines and books from the section “Electronics is Simple” and other literature from the series “For Dummies”. More sophisticated and clever books simply lack patience.

And then the reasoning goes approximately along this line: here, they say, made a simple amplifier, assembled several flashing lights (light effects), a charger. But it turns out that all this can be bought, if not new, then at least used, and it will turn out to be of better quality, in branded cases, even in working condition. The question is, where is the benefit, the economic effect of such occupations?

But perhaps you should not bother with such thoughts. After all, there are many examples that do not bring any benefits. These activities are called hobbies, i.e. a hobby in which one should hardly look for meaning ...

At times, it seems that enough has been said about the rules for installing and operating electrical wiring. But, oddly enough, the question "what is the wiring and how is it arranged?" still many may be confused.

If you believe GOST, then the wiring in the apartment is a combination of all conductors, as well as fasteners and fixation devices for these conductors, together with installation products and protection devices.

That is, the input cable, socket conductors and wires of the lighting circuit are electrical wiring. Sockets, switches, most of the lamps are also electrical wiring. We include junction boxes, cable channels, switchboards and automatic machines there. These are, so to speak, “actors.” And the “plot” is a simple relationship and relationship of these elements. Wiring in the apartment begins with an input cable ...

In this article, we will consider the question of how to find the phase and zero using a probe and a multimeter.

If it is necessary to service apartment electricians, in particular replacing sockets, lighting switches or conducting minor repairs, it becomes necessary to determine the phase and zero. If a person has some knowledge in the field of the basics of electrical engineering, then it will not be difficult for him to find phase and zero. But what if you do not have these skills? Finding phase and zero is not as complex a process as it might seem. Consider several methods for determining phase and zero.

First, we will determine what phase and zero are. Our entire energy system is three-phase, including low-voltage lines that feed residential buildings and apartments. As a rule, the voltage between any two phases is 380 volts - this is a linear voltage ...

With electricity you need to be on you !!! (time-tested wisdom).

Many probably heard that a real electrician is not one that is not afraid of electricity, but one that is able to avoid direct contact with electricity. According to statistics, from electric shock, most often die electricians with experience of ten years or more. It is at this age that a sense of danger is dulled. Some experienced electricians test the presence of electricity by touch, yes, it is by touch. But why risk your own life when there are devices showing the presence of voltage?

There are a lot of devices showing the presence of voltage - from the simplest voltage indicator on a gas discharge lamp (neonka) to devices showing not only the presence of voltage but also many other parameters. In this article we will consider indicators and voltage indicators ...

This article provides an example of repairing the Nokia WH-205 headset with illustrative illustrations. This method is suitable for repairing any wired headset or earphones of a mobile phone.

Very often, owners of mobile phones are faced with the problem of failure of a wired headset (headphone). In this case, there may be no sound in the headphones or the microphone may not work. As a rule, a person acquires a new headset or gives an old one for repair. Why spend money if you can repair your headset yourself? In this article, we answer the question of how to repair any wired headset or headphones yourself.

Consider a good example of repairing a Nokia WH-205 headset. The main reason for a headset malfunctioning is damage to the wire or wire breakage at the place of soldering in the microphone unit or to the plug ...

Fundamental science in recent years has rarely spoiled engineers with discoveries suitable for industrial implementation. But the last two decades have become a pleasant exception. Two Nobel Prizes and a third discovery, not yet appreciated by the Nobel Committee, created prospects for engineers and technologists to work for many decades. And they are all associated with one element - carbon.

Why are these discoveries so important and what new can such a familiar chemical element give us? Everything that we know about carbon makes it the most interesting and important element of the periodic table. To begin with, life itself arose on a carbon basis. The ability of carbon atoms to combine into complex structures has allowed nature to create protein organisms and breathe the mind into humans. All organic chemistry with its abundance of new, artificial materials ...

In the case of repair of electronic devices, the “ringing” of the transistor installed in the circuit is not always possible, so you have to solder it from the circuit. Often this interference leads to damage to the printed circuit boards, and sometimes to the transistors themselves. Therefore, it is very good if there is a device at hand that allows you to determine the health of the transistor without evaporating it from the board. Schemes of such devices are given in this article.

The basis of the circuit is a classic blocking generator. The output of such a generator produces short rectangular pulses. Naturally, in order to get a working blocking generator to the probe socket, you need to get the tested transistor. Fluctuations are obtained due to the positive feedback in the transformer through the coupling winding.The optimal feedback value is selected by rotating a variable resistor ...