Electricity for beginners. Schemes, articles of the Free Technical Library

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Electricity for beginners. Schemes, articles, descriptions

Free library / Schemes of radio-electronic and electrical devices

Electricity for beginners

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Amateur radio power supply, 1,5-24 volts 3 amps

Section Power supplies. Sooner or later, a radio amateur faces the problem of making a universal power supply unit (PSU), which would be useful for all occasions. That is, it had sufficient power, reliability and a widely adjustable output voltage, besides, it protected the load from excessive current consumption during testing and was not afraid of short circuits. It is proposed, in the opinion of the author, that the most satisfying these conditions is a fairly simple power supply for repeating, providing a stabilized voltage of 1,5-24 V at an output current of up to 3 A. In addition, it can operate in the current source mode with the ability to smoothly adjust the stabilization current within 10-100mA or fixed currents 0,1A, 1A, 3A ... >>

Melodious call from a wristwatch

Section Calls and audio simulators. I had an imported electronic watch in a metal case with a faulty indicator. There are many names for watches of this type (for example, Montana), but they are all the same. With the current time on the indicator, the melody is turned on by constantly pressing the AL.TM button and briefly pressing the DATE button. This principle is implemented in the call. The watch battery is replaced with an A343 element, it lasts for several years. The element is best soldered, because. on - salt often comes out and it oxidizes. Instead of a piezo emitter, a load is necessarily turned on - capacitor C1 of the KM type (between the watch case and the spring) ... >>

Bridge power amplifiers. Part three, four-channel

Section Transistor power amplifiers. Now we will talk about 4-channel amplifiers. For the most part, they are used for automotive use, but, in principle, nothing prevents them from being used at home - their characteristics are quite decent, especially for the latest generation. Let's start with the TDA7560, manufactured by SGS-Thomson. As usual, this is a class AB bridge amplifier with all kinds of protections, Mute and StanBy functions, and, as you will see in the diagram, the almost complete absence of attachments. Well, this chip also works great for a load of 2 ohms ... >>

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Articles on electricity for beginners

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

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Regulatory documentation for an electrician

Latest news of science and technology, new electronics:

Artificial leather for touch emulation 15.04.2024

In a modern technology world where distance is becoming increasingly commonplace, maintaining connection and a sense of closeness is important. Recent developments in artificial skin by German scientists from Saarland University represent a new era in virtual interactions. German researchers from Saarland University have developed ultra-thin films that can transmit the sensation of touch over a distance. This cutting-edge technology provides new opportunities for virtual communication, especially for those who find themselves far from their loved ones. The ultra-thin films developed by the researchers, just 50 micrometers thick, can be integrated into textiles and worn like a second skin. These films act as sensors that recognize tactile signals from mom or dad, and as actuators that transmit these movements to the baby. Parents' touch to the fabric activates sensors that react to pressure and deform the ultra-thin film. This ... >>

Petgugu Global cat litter 15.04.2024

Taking care of pets can often be a challenge, especially when it comes to keeping your home clean. A new interesting solution from the Petgugu Global startup has been presented, which will make life easier for cat owners and help them keep their home perfectly clean and tidy. Startup Petgugu Global has unveiled a unique cat toilet that can automatically flush feces, keeping your home clean and fresh. This innovative device is equipped with various smart sensors that monitor your pet's toilet activity and activate to automatically clean after use. The device connects to the sewer system and ensures efficient waste removal without the need for intervention from the owner. Additionally, the toilet has a large flushable storage capacity, making it ideal for multi-cat households. The Petgugu cat litter bowl is designed for use with water-soluble litters and offers a range of additional ... >>

The attractiveness of caring men 14.04.2024

The stereotype that women prefer "bad boys" has long been widespread. However, recent research conducted by British scientists from Monash University offers a new perspective on this issue. They looked at how women responded to men's emotional responsibility and willingness to help others. The study's findings could change our understanding of what makes men attractive to women. A study conducted by scientists from Monash University leads to new findings about men's attractiveness to women. In the experiment, women were shown photographs of men with brief stories about their behavior in various situations, including their reaction to an encounter with a homeless person. Some of the men ignored the homeless man, while others helped him, such as buying him food. A study found that men who showed empathy and kindness were more attractive to women compared to men who showed empathy and kindness. ... >>

Random news from the Archive

Hydrogen from gold and rust 23.05.2013

Duke University engineers have developed a new way to produce pure hydrogen that could help solve the problem of unsustainable fossil fuels. There is a lot of hydrogen in the environment, but the production and transport of molecular hydrogen on an industrial scale is still an expensive and complicated matter. Moreover, with modern technologies for the production of hydrogen, carbon monoxide is often a by-product, which is toxic to humans and animals.

For the first time, scientists have managed to create a catalytic process for reforming petroleum products, which reduces the formation of harmful CO to almost zero. The new process produces hydrogen at much lower temperatures, with carbon dioxide and water as by-products. It should be noted that despite CO2 emissions during hydrogen production, atmospheric pollution by this greenhouse gas will even decrease, since hydrogen burns cleanly, with the formation of water.

The new hydrogen production process is based on the use of nanoparticle catalysts made of gold and iron oxide (rust). This is the know-how, because until now gold has been used as the only catalyst, while engineers at Duke University have used iron oxide as an enhancer of the catalytic reaction.

Thanks to the new catalyst, carbon monoxide emissions are negligible in the production of hydrogen: less than 0,002% or 20 parts per million. This not only reduces atmospheric pollution, but also allows the production of pure hydrogen suitable for use in fuel cells. What's more, the new catalyst has been running for over 200 hours without any sign of reduced efficiency or increased COXNUMX emissions.

While the exact mechanism of the catalyst is unknown - until now it was believed that iron oxide serves only as a supporting structure for gold. However, it turned out that it is able to directly influence the reforming reaction of petroleum products. Scientists believe that this is due to the size of gold nanoparticles and plan to continue experiments in this direction. It remains to be hoped that they will finally be able to find a sufficiently effective and safe method for the industrial production of hydrogen fuel.

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