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Residual current devices (RCD). Schemes, articles, descriptions

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Residual current devices (RCDs)

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Finalization of the acoustic system AC-35 (S-90)

Section Acoustic systems. Acoustic systems AC-35 (S-90) are known as one of the best acoustic systems of pre-perestroika times. They were produced by different factories and in a slightly different configuration, without changing in essence. For the modification, systems 35AS-012 GOST 23262-88 of the Bryansk Electromechanical Plant, released in January 1990, were used. They contain speakers 75GDN-3-4, 20GDS-3-4, 10GDV-2-16 and are designed for a frequency range of 40-25000 Hz (resistance 4 ohms). The refinement made it possible to reduce the unevenness of the frequency response at medium frequencies and get rid of their characteristic clatter and harshness at high frequencies by replacing the high-frequency head and mid-frequency damping. For the conversion we used Peerless 100 DT 26 72 SF FF WA 8 tweeters (catalog number 811827). Quite a good option, especially if you are not embarrassed by the prospect of spending about $53 on them, which is comparable to the cost of the S-90s themselves ... >>

Automatic voltage polarity switch for charger

Section Chargers, batteries, galvanic cells. The device described below is designed to charge 12-volt automotive batteries. Its main feature is that that it allows you to connect the battery without thinking about its polarity In a poorly lit garage, this is important because often the marking of the polarity of the charger clamps and the color of the connecting wires are difficult to distinguish ... >>

SAMSUNG flash memory chips

Section Reference materials. The article describes 4 Gbit flash memory chips K9K4G08Q0M-YCB0/YIB0, K9K4G16Q0M- YCBO/YIBO, K9K4G08U0M- YCBO/YIBO, K9K4G16U0M-YCB0/YIB0. These microcircuits are used as non-volatile memory in consumer, industrial and computer devices. In digital video and photo cameras, voice recorders and answering machines, these chips are used as memory for image and sound as part of solid-state flash drives. ... >>

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Articles on residual current devices

Articles on protective shutdown devices; descriptions of residual current devices: 10 articles



All articles for an electrician

Regulatory documentation for an electrician



Latest news of science and technology, new electronics:

Sound-absorbing silk 17.05.2024

In a world where noise is becoming increasingly intrusive, the emergence of innovative materials that can reduce its impact is of great interest. MIT researchers have unveiled a new sound-absorbing silk fabric that promises to revolutionize quiet spaces. The Massachusetts Institute of Technology (MIT) has made significant breakthroughs in the field of sound absorption. Researchers have developed a special silk fabric that can effectively absorb sound and create cozy, quiet environments. The fabric, thinner than a human hair, contains a unique vibrating fiber that is activated when voltage is applied to it. This feature allows the fabric to be used to suppress sound waves in two different ways. The first method uses fabric vibrations to generate sound waves that cover and cancel out unwanted noise, similar to noise-canceling headphones. This p ... >>

High Energy Density Capacitor 17.05.2024

Energy plays a key role in many aspects of modern life, and the ever-increasing demand for efficient and fast-charging power sources is driving innovation. Researchers at the McKelvey School of Engineering at Washington University in St. Louis have taken a significant step forward with a high-energy-density capacitor that promises to revolutionize the world of energy. A team of scientists from the McKelvey School of Engineering at Washington University in St. Louis presented the results of their latest research on heterogeneous thin-film structures for capacitors. Researchers, working with ferroelectrics, inadvertently created a capacitor with an amazing energy density that is 19 times higher than that of conventional elements. This breakthrough opens up new prospects for the development of fast-charging batteries, which are so necessary in the modern world. Capacitors play a key role in various devices, providing stable ... >>

Causes of conflicts between brothers and sisters 16.05.2024

Family relationships are often complex and multi-layered, and conflicts between siblings are no exception. Research in this area can help us understand what factors underlie these conflicts and why they occur so frequently. Let's look at some of the findings from psychologists at Arizona State University. American psychologists from Arizona State University conducted a study aimed at identifying the causes of conflicts between brothers and sisters. They found that different forms of violence, whether physical or verbal, did not depend on the gender of the siblings. This means that both girls and boys can exhibit aggressive behavior towards their loved ones. Other studies have shown that conflict between siblings often persists into adulthood, even as contact decreases. This indicates that people often follow established patterns of behavior formed in childhood. It was also found that, despite ... >>

Random news from the Archive

Modern teenagers are lagging behind in development 29.09.2017

Modern teenagers develop more slowly than their peers from previous generations, a study has shown. They are also less likely to participate in activities such as driving and working as adults.

American scientists decided to find out how fast modern teenagers are growing. It turned out that this indicator has significantly decreased compared to the growth rate of adolescents from previous generations.

Modern young people are much less likely to engage in any serious business like work or driving a car, preferring to be taken over by adults.

Researchers at the University of San Diego examined how often teens engage in activities that adults also do but children don't, including romantic dates, paid jobs, driving, traveling without parents, and having sex. They targeted 8,3 million teenagers aged 13 to 19 between 1976 and 2012.

The speed of development, hobbies, and leisure among adolescents in the 2000s, 1990s, 1980s, and 1970s were compared with each other. In general, it has been proven that the current generation of teenagers enjoys working, dating, drinking alcohol, going out without parents, or having sex much less than teenagers from previous generations.

This trend cannot be explained by the fact that teenagers are spending more time doing homework, as the volume and time spent on homework also decrease from generation to generation. It is possible, the authors of the study believe, that these changes can be explained by the amount of time that teenagers spend on the Internet. This indicator has demonstrated the most powerful growth in the last 20 years.

In addition, in recent years there has been significant infantilism, when teenagers prefer to stay longer on the neck of their parents. Perhaps this is due to an increase in overall life expectancy, the tendency of women to give birth to children at a later age, as well as later education. Many teenagers simply do not want to take responsibility, preferring to leave it to adults.

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