In power engineering, electronics and other branches of applied electrical engineering, a large role is given to transformations of electromagnetic energy from one type to another. Numerous transformer devices, which are created for various production tasks, deal with this issue.

Some of them, having the most complex design, perform the transformation of powerful high-voltage energy flows, for example. 500 or 750 kilovolts in 330 and 110 kV or in the opposite direction. Others work as a part of small-sized devices of household appliances, electronic devices, automation systems. They are also widely used in various power supplies of mobile devices. Transformers work only in alternating voltage circuits of different frequencies and are not intended for use in DC circuits that use other types of converters ...

Today it is hardly possible to surprise anyone with just a luminous sign or a bright light box with a painted picture. The consumer requires spectacles, and a static advertising image is rapidly becoming a thing of the past, giving way to dynamic displays and signs with running lights, iridescent letters, and in general, dynamics is replacing statics, and this is not at all surprising, because programmable LED controllers appeared on the market allowing it is easy to create unique lighting dynamic effects that, in combination with modern LEDs, are capable of creating real miracles of visualization.

A small controller box for signs at the request of the designer will revive the LED line, the composition of the LED duralight, or a large LED cluster - a block of individual LEDs or a block of entire LED lines. Solutions based on RGB LED clusters ...

When a person gets under electric voltage, an electric current begins to flow through his body, and the magnitude of this current depends not only on the magnitude of the applied voltage, but also on the resistance of the human body. Meanwhile, the resistance of the human body is by no means constant; its value depends on many factors: on the state of the person at the moment of contact (mental and physical), on the parameters of the closed circuit, on the external environmental conditions in which the person is at the time of the impact.

The human body consists of various tissues, and each type of tissue has its own resistance. For example, tendons, skin, adipose tissue, cartilage and bones have a resistivity of the order of 3 to 20 kΩ / m. Blood, muscles, lymph, brain and spinal cord - only from 0.5 to 1 Ohm / m. Of all these tissues, skin is the most resistant, therefore it is the skin that largely determines the resistance of the human body to electric current ...

Modern digital technology requires high accuracy, so it is not surprising that almost any digital device, which would not catch the attention of the average man today, contains a quartz resonator inside. Quartz resonators for various frequencies are necessary as reliable and stable sources of harmonic oscillations, so that the digital microcontroller could rely on the reference frequency and operate with it in the future, during the operation of the digital device. Thus, a quartz resonator is a reliable replacement for an oscillatory LC circuit.

If we consider a simple oscillatory circuit, consisting of a capacitor and an inductor, it quickly becomes clear that the quality factor of such a circuit in the circuit does not exceed 300, moreover, the capacitance of the capacitor will float depending on the ambient temperature, the same will happen with the inductance ...

Now you can quite simply purchase equipment for the protection of an apartment or house in a store or order it via the Internet. It will differ in the number of constituent elements, their capabilities, but have common features.Thanks to the built-in power supply module and all the elements inherent in mobile communication devices with a SIM card, including a microphone and speaker, such a remote control can operate in a mobile phone mode. Through it, you can conduct conversations and send SMS messages, which is used to immediately transmit information to the apartment owner about the operation of a specific sensor.

The presence of factory mounting methods in the form of special sockets for screws allows you to install a security unit at the exit of the apartment near the door, which is quite convenient for constant use Individual owners place it in a conspicuous place, using it to decorate a room or as a wall clock. However, it is worth considering...

Issues of home security and property conservation concern every apartment owner. People solve them in various ways, including the installation of a security alarm system, which makes it possible to effectively identify the occurrence of an unusual situation in the area of ​​their residence, and take effective measures to prevent theft. The term security alarm refers to a set of technical means operating in automatic mode, which is designed to detect cases of unauthorized access of people to the protected zone and take effective measures to suppress them.

Typically, the controlled space is divided into several composite zones, including: the external lines of observation of the approach to the house, the internal space of the apartment, the condition of the fencing of building structures with the ability to penetrate through: walls, windows and doors, roof, basement. The simplified structure of such a system can be imagined ...

In the operation of home wiring, the most important issue is the safety of the operation of household electrical appliances. Grounding of electrical wiring is the main way to minimize the impact of electric current on a person in the event of a life-threatening potential on the metal case of household electrical appliances. The problem of the lack of grounding in the apartment or in the house is quite common due to the power supply from outdated TN-C configuration networks in which the grounding of home electrical wiring is not provided.

To solve the problem, proceed as follows - ground the electrical wiring through the alteration of the TN-C system to TN-C-S. As a result, improper grounding of the wiring makes the operation of the wiring even more dangerous than in the absence of grounding per se. In this article, we consider the danger of self-grounding ...

Luminescent lighting in the form in which we have it today is about 80 years old, although the history of the formation of technology lasted about the same, that is, in general, about 160 years have taken the path of technology of luminescent lamps.

Before a fluorescent lamp appeared in every house, before fluorescent lamps appeared in street lighting, before fluorescent lamps appeared in offices, engineers and scientists went a long way from inventing a vacuum tube, through experiments with glowing inert gases under high voltage, to developing integral technology with reliable and high-quality fluorescent coating of luminous tubes and a suitable power supply circuit for fluorescent lamps. The first gas-discharge lamp (in the form of an experimental setup) will be released in 1856, and it will be a Geisler tube.German glassblower Heinrich Geisler was distinguished by inventive talent, and thanks to the vacuum pump...