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Mixers, frequency converters. Schemes, articles, descriptions

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Mixers, frequency converters

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10,1 MHz Delta-Loop Antenna



HF Antenna Section. The figures show the construction of a triangular antenna (Delta-Loop) for the 10,1 MHz band. Delta gave an average increase of 6 dB in comparison tests with a conventional Slopper dipole during QSO's with ten German stations. Fig. 1 shows the top of the mast with a lifting roller and the upper corner of the antenna web, Fig. 2 - the attachment point of the lower corner of the web through an insulator to a synthetic cable extension, Fig. 3 - scheme of the gamma matcher, Fig. 4 - Delta-Loop sketch ... >>

3V battery low indicator



Section Chargers, batteries, galvanic cells. The proposed device allows you to monitor the state of the battery and, when the voltage on it drops below 2 V, signal the need for urgent recharging. In this case, the LED starts flashing with a period of about 2 s. The indicator can also be used in other devices if it is required to control the voltage and signal its decrease below a predetermined level. It is only required to select the threshold. The battery voltage is supplied to the input of the indicator and through a non-linear voltage divider R1-VD1-VD2-VD3 to the base of the transistor VT1. Divider elements determine the threshold for the indicator ... >>

Electronic massage therapist



Section Electronics in medicine. This device (Fig. 1) is intended for massaging weakened muscles after an illness, and also serves for muscle and skin gymnastics. Transformer Tr (incandescent) - 6,3 V / 127 V. The electrodes are mounted on a plastic tube (Fig. 2). A wire is wound at its ends - without insulation (10 turns each). Two strips of metal foil are laid over the wire at a distance of 25 mm. In the process of electrification, foil plates are taken ... >>

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Articles on mixers, frequency converters

Articles on mixers, frequency converters; schemes of mixers, frequency converters; descriptions of mixers, frequency converters: 10 articles

 


 

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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

Dolphin paradox resolved 16.10.2009

In 1936, English biologist John Gray calculated that a dolphin could not swim at 35 kilometers per hour because its muscle mass was insufficient to overcome water resistance at that speed. Since dolphins actually achieve even faster speeds, biologists have started talking about the "dolphin paradox".

Gray himself suggested that the matter was in the structural features of the dolphin skin, and since then the problem has been studied from this side. But recently, Professor Timothy Wei of Rensselaer Polytechnic Institute (USA) has shown that in fact the muscles of the dolphin are 10 times stronger than it was thought in Gray's time.

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