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Electrical materials. Schemes, articles, descriptions

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Electrical materials

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invisible antenna

HF Antenna Section. For radio amateurs living in densely populated urban areas, an important parameter of the antenna is its inconspicuousness to others. The proposed antenna has good electrical parameters and is constructed in the form of a two-wire line, similar to the radio transmission lines that run along the roofs of most houses and between them. It is desirable to use the same materials and methods of fastening as for the transmission lines. Based on the J-shaped antenna described in the book by K. Rothammel ... >>

Integral timer in temperature-frequency converter

Section for radio amateur-designer. An integral timer type 555 in self-excited multivibrator mode can be used to generate a square-wave voltage whose frequency exactly matches the measured temperature. In this case, the thermistor with negative TC is used in the charging circuit of the timer. When the temperature changes from 3 to 46 ° C, the frequency at the output of the circuit changes according to an almost linear law in the range from 38 to 114 Hz. In this entire temperature range, there is not a single point where the frequency deviates from the ideal dependence by more than ±1 Hz. Few parts, low cost, and low power requirements (9,3 mA at 10 VDC) make this temperature-to-frequency converter suitable for telemetry applications. ... >>

Stabilizer with a small minimum voltage drop, 5-10/5 volts

Section Voltage stabilizers. One of the important parameters of series voltage stabilizers (including microcircuit ones) is the minimum permissible voltage between the input and output of the stabilizer ΔUmin at maximum load current. It shows at what minimum difference between the input Uin and output Uout voltages all parameters of the stabilizer are within normal limits. Unfortunately, not all radio amateurs pay attention to it; usually they are only interested in the output voltage and maximum output current. Meanwhile, this parameter has a significant impact on both the quality of the output voltage and the efficiency of the stabilizer ... >>

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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

E-cigarette can hack your computer 22.06.2017

Electronic cigarettes can be used to hack a computer with minimal effort. This was reported by cybersecurity researcher Ross Bevington. At the BSides London 2017 conference, he demonstrated the hacking process. According to the researcher, his tactics are effective for unlocked systems, but it is possible to develop a cigarette attack scenario that will work on locked PCs.

Since e-cigarettes are charged via a USB port, owners often plug them into a computer rather than directly into a power outlet. By installing an additional microcircuit in a cigarette, you can convince the PC that it is a keyboard. Accordingly, the OS will begin to execute all commands coming from the connected device. Another option is also possible: the cigarette begins to interact with network traffic, which also leads to hacking.

According to Bevington, the electronic cigarette cannot contain too large code, which imposes restrictions on the choice of malware. For example, the notorious WannaCry ransomware is hundreds of times larger than the cigarette limit. However, theoretically, the cigarette can be modified in such a way as to download a larger file from the Internet.

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