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Electricity for beginners. Schemes, articles, descriptions

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Electricity for beginners

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Small square antenna



HF Antenna Section. Among the problems that short-wave radio amateurs have to face, the main one, perhaps, is the problem of manufacturing a sufficiently effective and at the same time not very complicated antenna in terms of design. There is no doubt that a rotating directional antenna can provide the best results. However, almost all antennas of the final type are quite bulky and structurally complex, which makes it difficult for many amateurs to use them. The article published below proposes a method for significantly reducing the geometric dimensions while maintaining a sufficiently high efficiency of antennas, which will undoubtedly be of interest to shortwave operators. ... >>

Mains outage sensor



Section Protection of equipment from emergency operation of the network, uninterruptible power supplies. Constant mains voltage is not only convenient in terms of, for example, artificial lighting, but also vital if it is the only source of energy that ensures the heating of the greenhouse, maintaining the temperature of the refrigerator or freezer. In addition, the absence of voltage in the network for a long time makes the security system vulnerable. It is enough for a cunning burglar to burn the electric meter and plugs and calmly empty your house, since all the batteries will be discharged. A miniature low-voltage relay is permanently connected to the 220 V network. It has electrical contacts that can be included in the monitoring circuit of a console or telephone transmitter. This relay controls a low-voltage electrical circuit by means of a break contact (rest contact) ... >>

Load switch from horns



Section Clocks, timers, relays, load switches. The device is designed to turn on / off the load from sound signals, such as clapping hands. The cotton received by the microphone and amplified by the transistor VT1 is fed to a monostable multivibrator, made on an integral timer DD1. A D-trigger on a DD2 chip is connected to its output, which changes its state to the opposite with each pulse entering from the multivibrator. In short, it all works like this - slammed once - the relay closed, slammed a second time, the relay opened ... >>

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Articles on electricity for beginners

Articles on electricity for beginners; electricity theory for beginners: 74 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

Cat language inspires scientists to discover new things 23.01.2019

A small cat language can become the basis for a huge number of new scientific discoveries. Scientists are trying to copy the beneficial properties of cat language in order to create new useful things. Its rough surface may be suitable for more than just licking. Scientists at the Georgia Tech Research Institute believe that the useful properties of language can be copied.

It all started with researcher Alexis Noel becoming interested in Murphy's own cat. One day, in front of a scientist, a cat decided to lick a microfiber blanket and its tongue stuck to the fabric. The researcher thought: why did the tongue stick at all? At first she thought cats had tongues like sandpaper. She began to study it under a microscope. As a result, I found out that the tongue of a cat is covered with sharp, wrapped processes in the form of a claw. They are pressed to the tongue. But when a cat licks its fur, they rise up.

The researcher also found a small channel on each process. Noel came to the conclusion that it is through them that the saliva of a cat passes through a thick layer of wool to the skin. This is necessary not only for cleansing: this is how the cat cools down in the heat.

Now the researchers want to patent their research so they can develop a variety of useful things, such as carpet cleaning brushes or devices for applying drugs to the skin of thickly furred pets.

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