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Building a hybrid cascade



Section RF power amplifiers. In amateur communication KB equipment, hybrid stages are often used with the inclusion of a transistor in the cathode of the output lamp of the transceiver. But what if the cathode of the lamp is connected to a filament or a direct incandescent lamp is used? A possible option for building a hybrid cascade with GI-7B, GK-71 (VL1) lamps is shown in the figure. A three-winding choke-transformer is included in their heating circuit. A transistor is connected to one of its windings, for example. KT907, KT904 ... >>

Possible malfunctions



Section Beginner radio amateur. The detector receiver is the simplest radio engineering device. However, in it, as in a complex receiver, there may be problems that you need to be able to find and fix. The least malfunctions occur, as a rule, in the receiver, the parts of which are firmly fixed, the installation is done carefully, and all connections are securely soldered. But if, nevertheless, the receiver stops working or works intermittently, then somewhere there is an open, unreliable or very bad contact, a short circuit has occurred. First of all, it is necessary to see if there are any external damages in the coil, if the antenna and ground are well connected, if the switch is in order. ... >>

Simple heat stabilizer, 1-80 degrees



Section Power regulators, thermometers, heat stabilizers. The device is universal and is designed to maintain a fixed value of a given positive temperature in the range of +1...80 °C with an accuracy of 0,2 °C. The heat stabilizer can be used in an artificial incubator for hatching chickens from eggs (+37,5 °C), a drying cabinet (+60 °C), a home bath, or maintain a positive temperature (+2 °C) in an insulated storage for vegetables on the balcony at negative ambient temperature. In this case, the operation of the device is not affected by possible instability of the mains voltage. The device is powered using a transformerless circuit (Fig. 1.15) directly from a 220 V network, which makes it possible to significantly reduce its dimensions ... >>

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Electrician Tool Articles

Articles on tools for an electrician; electrician tool descriptions: 30 articles

 


 

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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

Celebrities in junk food ads 13.06.2016

A study by NYU Langone Medical Center experts found that most of the foods and drinks that popular musicians face in advertising are unhealthy - and above all, the health of teenagers, the main fans of pop stars. According to researchers, this situation largely contributes to the development of childhood and adolescent obesity.

Most often, musicians popular among teenagers advertise sweet carbonated drinks, fast food and various sweets, the authors found out after analyzing advertising messages. They evaluated the popularity of musicians using various charts, including those based on the opinions of teenagers, such as the Teen Choice Award. Next, the scientists correlated it with the number of views of videos on YouTube, where the musicians advertise food and drinks. In addition, using a special database, they found all the commercials with the participation of stars for the period 2000-2014, which appeared on TV, in magazines and on radio, and compiled a list of concerts sponsored by beverage and food manufacturers.

The researchers found that 65 pop stars are associated with advertisements for 57 different foods and drinks. For each of these products, they found information on its nutritional value. It turned out that 81% of them are defined as poor in nutrients, drinks were most often in the category of very sweet, with an excess of sugar.

Beverage and food companies spend huge amounts of money on advertising aimed at teenage audiences. And shooting stars in it makes this advertisement popular among teenagers. The age-related desire to imitate idols leads to unhealthy eating habits, which affects the health of young people, scientists warn, and call for the adoption of any regulations in this area.

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