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Knots of amateur radio equipment. Schemes, articles, descriptions

Free library / Schemes of radio-electronic and electrical devices

Nodes of amateur radio equipment

We recommend reading in our Free Technical Library:

A simple temperature compensated voltage regulator for a car



Section Car. Batteries, chargers. Most of the described amateur voltage regulators for a car, as well as industrial regulators that are equipped with mass-produced cars, are designed to maintain an unchanging stable voltage at the generator terminals. When the load increases (headlights, fan and other consumers are turned on), the voltage drop on the wires increases, and the voltage of the on-board network decreases accordingly, and the battery charging current also decreases. ... >>

Unpretentious metal detector with increased sensitivity, working on the principle of beats



Section Metal detectors. The metal detector (Fig. 2.28, a) works on the principle of beats, which are formed due to the difference between the oscillations of the reference and search oscillators (on the 5-10th harmonic, the closest in frequency is selected). This allows you to bring the sensitivity of the device to a high level, which makes it possible to detect: a five-kopeck coin in the ground at a depth of 10 cm, a steel manhole cover or pipe - at a depth of 65 cm ... >>

Making a printed circuit board at home



Section Ham Radio Technologies. Being in amateur radio for many years I made printed circuit boards in many ways. I painted with varnish (remember those times), with a cutter (simple boards), etc. Recently, the method of a laser printer and an iron for transferring a pattern to foil fiberglass has become popular. According to various recommendations and articles on the Internet, I tested almost all the materials that were recommended. Thin glossy paper from magazines, photo paper, fax paper, backing paper from self-adhesive film, and even thermal transfer paper for fabric. I’m lying, I haven’t tested food grade aluminum foil ... >>

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Articles on the nodes of amateur radio equipment

 


 

Generators, heterodynes

Articles on generators, heterodynes; circuits of generators, local oscillators; descriptions of generators, local oscillators: 100 articles

 


 

Quartz filters

Articles on quartz filters; circuits of quartz filters; descriptions of quartz filters: 10 articles

 


 

Modulators

Articles on modulators; modulator circuits; descriptions of modulators: 8 articles

 


 

Signal limiters, compressors

Articles on signal limiters, compressors; circuits of signal limiters, compressors; descriptions of signal limiters, compressors: 3 articles

 


 

Mixers, frequency converters

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

Filters and matching devices

Articles on filters and matching devices; schemes of filters and matching devices; descriptions of filters and matching devices: 49 articles

 


 

Miscellanea

Articles on the nodes of amateur radio equipment; diagrams of various components of amateur radio equipment; descriptions of various components of amateur radio equipment: 38 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

32 Gb ReRAM chip 23.02.2013

Back in early January, the preliminary program of the ISSCC 2013 conference announced an interesting joint report by SanDisk and Toshiba on the development of the industry's first ReRAM chip (resistive memory) with a capacity of 32 Gbps. And now some detailed information about the new product has become available.

The chip was released using a 24nm process technology. The area of ​​one cell is 24 x 24 nm, and the area of ​​the entire crystal is 130,7 mm2. The memory page size is 2 kilobytes. The read and write latencies are 40 and 230 µs, respectively.

The traditional cross-point ReRAM architecture uses conductive metal oxides. Selective devices are located at the intersection of horizontal lines and vertical bit lines, and cells are formed in the same plane with other circuits. The new chip forms a two-layer array of memory cells on shared page registers and readout amplifiers. This made it possible to increase the density of the components. According to the source, this approach is similar to the technology of Matrix Semiconductor, which was bought by SanDisk.

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News feed of science and technology, new electronics

 

Interesting materials of the Free Technical Library:

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