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Radio amateur technologies. Schemes, articles, descriptions

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Amateur Radio Technology

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Storozh-R - continuous radiation monitoring device



Section Dosimeters. Technogenic pollution of the environment is often viewed as an inevitable price to pay for the conveniences of civilized life that scientific and technological progress provides us with. But if we ourselves can judge pollution, at least somehow manifesting itself, we can somehow minimize their impact on ourselves, then in relation to substances, fields, environments that are inaccessible to our senses, we find ourselves in a different position: not only to take any measures of self-defense, but we cannot simply find out about the appearance of such a danger, even for its long existence ... >>

Battery charger, 2,5 amps



Section Chargers, batteries, galvanic cells. This battery charging current source is capable of delivering up to 2,5A with up to 96% conversion efficiency. It can run on AC adapter or car battery. The device does not affect the ground resistance of automotive electrical equipment, since the charge current is measured in the positive rail. The charger works with batteries containing 5 to 15 cells, and its input voltage can be from 28 V to a level that is only 1,5 V more than the voltage at the poles of a fully charged battery. Charging current is generated by IC1, a current mode stabilized buck-switch converter controller operating with an external power switch (Q1 transistor) and a synchronous rectifier (Q2 transistor) ... >>

Economic FET stabilizer, 10-20/9 volts 150 milliamps



Section Voltage stabilizers. The recommended voltage regulator is designed to power high-quality equipment. The use of a field-effect transistor as a regulating transistor (VT1) in it made it possible to supply a reference voltage source (resistor R1, zener diode VD1) and a DC amplifier (operational amplifier DA1) with an output stabilized voltage, and also to weaken to a minimum the connection between the input and the stabilizer (through the drain channel - source of the transistor), which reduced the penetration of input voltage ripples into the load ... >>

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Articles on amateur radio technology

Articles on amateur radio technologies; descriptions of amateur radio technologies: 256 articles

 


 

Latest news of science and technology, new electronics:

The speech of sperm whales is similar to that of humans 18.05.2024

In the world of the ocean, where the mysterious and unknown coexists with the studied, sperm whales, with their huge brains, are of particular interest to science. Researchers, working with a huge array of audio recordings collected during the Dominica Sperm Whale Project (DSWP) - more than 8000 recordings, seek to unravel the secrets of their communication and understand the structure and complexity of the language of these mysterious creatures. By studying in detail the recordings of 60 sperm whales in the eastern Caribbean, scientists have revealed surprising features of their communication, revealing the complexity of their language. "Our observations indicate that these whales have a highly developed combinatorial communication system, including rubato and ornaments, which indicates their ability to quickly adapt and vary during communication. Despite significant differences in evolution, sperm whales have elements in their communication that are characteristic of human communication," says Shane Gero, a biologist at Carleton University and director of the CETI project. Issl ... >>

Electron spin for quantum information transfer 18.05.2024

The transfer of quantum information remains one of the key tasks of modern science. Recent advances in the use of electron spin to expand the capabilities of information transfer in quantum systems have become very important. Researchers at Lawrence Berkeley National Laboratory are pushing the frontiers of quantum information science by experimenting with the possibilities of electron spin. Electron spin, a natural quantum bit, is a potentially powerful means for storing and transmitting information in quantum systems. Magnon wave packets, collective excitations of electron spin, have revealed their potential to transmit quantum information over significant distances. The work of Berkeley Lab researchers has revolutionized the way such excitations propagate in antiferromagnets, opening up new prospects for quantum technologies. Using pairs of laser pulses, scientists disrupted antiferromagnetic order in one place and simultaneously studied it in another, creating ... >>

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 ... >>

Random news from the Archive

New digital camera reference design announced 24.03.2007

Texas Instruments Corporation, a leading manufacturer of semiconductor products, announced the development of a new reference design based on the DaVinci image processor that increases the performance of digital compact cameras "to the level of SLRs."

The main advantage of the new idea is to increase the speed of serial shooting of digital compacts up to 5 frames per second. Recall that even entry-level and mid-level digital SLR cameras cannot boast of such speed, for example, the rate of fire of such models as the Canon EOS 400D, Nikon D80 and Sony DSLR-A100 is "only" 3 frames per second.

The reference design includes Micron Technology's new 8-megapixel CMOS sensor and a proprietary high-definition (HD) video hardware codec capable of "bringing HD video to sub-$99 models."

Moreover, according to the official press release, the new image stabilization system, coupled with the high performance of the DaVinci processor, reaching 10 megapixels per second, will enable manufacturers of digital cameras to set the sensitivity of new models up to ISO 10000.

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News feed of science and technology, new electronics

 

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