Low frequency amplifiers. Schemes, articles of the Free Technical Library

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Low frequency amplifiers. Schemes, articles, descriptions

Free library / Schemes of radio-electronic and electrical devices

Low Frequency Amplifiers

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Rectangle UB5UG

HF Antenna Section. In the manufacture of a KB antenna, gain can be gained if the usual double-square antenna frame is converted into a rectangular one, as shown in Fig. 1. Active, or radiating, are the vertical sides of the antenna. To increase the efficiency, it is advantageous to make them from duralumin tubes with a diameter of 10-20 mm. The horizontal sides - reactive - complement the perimeter of the rectangle to the resonant length and are made from a conventional antenna cord. The upper side is torn exactly in the middle by a nut insulator so that the current distribution in the frame does not depend on the feeder connection point, by changing which you can match the antenna with any cable. The input impedance of the frame varies from 30-40 ohms (the feeder is connected in the corner of the frame) to several thousand ohms in the center of the horizontal side ... >>

Standard fluorescent lamps. Marking

Section Fluorescent lamps. An example of marking standard foreign LL is shown in fig. 2.4. The marking of domestic LL usually consists of 2-3 letters and numbers. The first letter L means luminescent. The following letters indicate the color of radiation: D - daylight, HB - cold white, B - white, TB - warm white, E - natural white, K, W, 3, G, S - respectively: red, yellow, green, blue, blue, UV - ultraviolet. For lamps with improved color rendering quality, after the letters denoting the color, there is the letter C, and for especially high quality color rendering, the letters CZ ... >>

Power supply for Chizhevsky chandelier

Section Electronics in medicine. In the January and February issues of the Radio magazine of the current year, it was told about the unique invention of our compatriot A.L. Chizhevsky - an air ionizer, later called the Chandelier of Chizhevsky. Hundreds of readers who are interested in this installation, which can create a relaxation area with mountain air in the apartment, call and write to the editorial office. Today's story is devoted to two more options for a high-voltage block needed to power an electro-fluvial chandelier - a generator of negative air ions. As already reported in [1], the DC voltage of negative polarity supplied to the electro-fluvial chandelier should not be lower than 25 V, otherwise the desired effect from the air ionizer will not be. Therefore, any power supply assembled according to the schemes published in [000, 1] or designed independently must meet precisely this most important requirement. ... >>

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Articles on low frequency amplifiers

Articles on low frequency amplifiers, low frequency amplifier circuits, descriptions of low frequency amplifiers: 34 articles

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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 ... >>

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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

Racing car of the future 08.12.2015

Formula 1 cars are often used to test new technologies that may in the future migrate to conventional cars. And where will the technology of the future for the racing cars themselves come from? This question was answered by McLaren, which recently showed the MP4-X Formula One concept car.

In collaboration with their racing partners, Honda, McLaren engineers came up with a number of ideas that they believe meet the requirements for the cars of the future. For example, given the general trend towards "electrification", including racing cars, recharging in a promising car will be carried out using the mutual induction of conductors in the car and on the track itself. A fundamentally new approach to the layout is also proposed, in which technological components are "packed" into structural elements - say, "thin" batteries are located in a protective frame, and solar panels are installed in the case for additional recharging and energy storage near the place of its use.

Another look into the future is the use of a protective cap in the future car. Formula 1 purists, of course, will not like this idea. However, all trends in the development of the organization, as well as accidents with serious consequences, indicate that the safety of drivers will become the most serious requirement, that is, a cap is indispensable.

But the most important difference of the future car is that it will not have a steering wheel and pedals. McLaren has partnered with international pharmaceutical giant GlaxoSmithKline to sponsor research into neuropathology, including amyotrophic lateral sclerosis. The company hopes that the results of the research will help create a system that will allow you to drive a car using electrical brain impulses and gestures.

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