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Radio reception. Schemes, articles, descriptions

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radio reception

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Charging and desulfating machine for car batteries



Section Car. Batteries, chargers. It has long been known that the charge of electrochemical power sources with an asymmetric current, at a ratio of Icharge : Idischarge = 10:1, in particular acid batteries, leads to the elimination of sulfation of the plates in the battery, i.e. to restore their capacity, which in turn prolongs battery life. It is not always possible to be near the charger and control the charging process all the time, so often the batteries are either systematically undercharged or recharged, which, of course, does not extend their service life. ... >>

Megashoker-2 (Improved high power stun gun circuit)



Section Security and safety. Personal safety. This scheme is an improved version of the original Megashocker scheme. Due to the use of a PWM controller with a complementary output, the heating of transistors in it is much less, respectively, the efficiency of the device is higher (> 90%). Transformers, EU-but, are the same as in the first version of the circuit. The frequency of the converter seems to be adjusted by R5, but C7, apparently, will have to be selected for the required power (starting somewhere with a thread from 2 nF). C7 must be rated for a voltage of at least 630v. For the rest, see the description for MegaShocker v1.1 Regarding the cross-sectional area of ​​​​the T2 trance core: 450 sq. mm is not a joke, I even made 540 for myself. Only such a trance will transmit impulses with an energy of 1,8 ... 2,4 J without loss Dimensions of the device: there was an opinion here that the device would have to be carried along on a trolley. :) I authoritatively declare: nifiga - everything is in your hands! And in the wallet ... >>

Amplifier on the chip K174UN7



Section Transistor power amplifiers. Old design, but good quality. This is one of the simplest options for a low-frequency power amplifier using the K174UN7 chip. Output power 4,5W. The load can withstand up to 4 ohms. The microcircuit is Soviet, but finding it is not a problem. They are full of transistor TVs. The microcircuit should be installed on a small heatsink (All boards come with heatsinks, so this is not a problem either. But if you can’t find it already, you can use foreign analogues: TBA810AS and LA4420 (they are naturally more expensive) ... >>

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Articles on radio reception

Articles on radio reception; diagrams of devices for radio reception; descriptions of devices for radio reception: 299 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

Users of online stores browse products more often than they buy them 30.08.2022

The share of visits to online stores that ended with the purchase of any goods is in the range of 1-2%, and in some states it is even lower.

A new study has shown that online shopping is most often not shopping in the strict sense of the word. The fact is that in 33 out of 57 countries studied by experiments, the number of visits to online stores, during which users purchased any product, does not exceed 2%.

In dozens of countries, this figure is even lower. In India, as well as in the countries of South America, the number of visits to online stores that ended in purchases of goods does not exceed 1%. The highest rates were recorded in the Netherlands (3%), the UK (2,9%) and Switzerland (2,6%).

Despite this, the study clearly demonstrates that in most cases, Internet users are limited to browsing products on online platforms.

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