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Low frequency amplifiers. Schemes, articles, descriptions

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Low Frequency Amplifiers

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VHF block (144, 430 MHz)



Section Civil radio communications. For field equipment in the ranges of 144 and 420 MHz, 6NZP lamps are the most acceptable of running lamps. With equipment assembled on these lamps according to push-pull circuits (Fig. 1), it is possible to remove not only an increased power of the order of 1,5-2,5 W, such equipment is more stable in frequency and less capricious in establishing and operating under certain conditions. On VHF, circuits with a grounded (common) grid are the most successful, but in order to reveal their advantages, it is necessary that the inductance in the grid circuit (common electrode) be reduced to the limit, so that the cathode circuit, which is under RF voltage, is isolated from the filament circuits or the last must have the same RF potential with the cathode. Usually in amateur designs these conditions are not met, and therefore we will explain their meaning in more detail. ... >>

Charger for nickel-cadmium batteries



Section Chargers, batteries, galvanic cells. At present, miniature MP3 players are very popular, especially among young people, as well as electronic cameras that are powered by a voltage source of 1,2 ... 1,5 V. The use of galvanic disposable cells is hardly justified here - the current consumption is high, and even with prolonged continuous operation. Ordinary AAA cells have to be changed several times a day in this mode, which is quite expensive, but the battery can save you a lot of nerves and money. In order for the battery to serve for a long time, it is necessary to ensure its optimal mode, both charging and discharging. ... >>

Monitor Audio Amplifier



Section Transistor power amplifiers. Not all computer sound cards are designed to accept low-impedance headphones, and those that do are usually not capable of sufficient output power for some low-impedance (less than 16 ohm) as well as relatively high-impedance stereo phones. In addition, when they are directly connected to the output of a sound card, there is a risk of damage to it. All this forces cautious PC users to connect their headphones to the appropriate output of an audio power amplifier or preamplifier. In pre-amplifiers, made as an independent device, there is usually an amplifier for headphones, assembled, for example, on the popular K157UD1 op-amp. In UMZCH, signals to the phone jack usually come from the outputs of amplifiers through current-limiting resistors ... >>

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Articles on low frequency amplifiers

Articles on low frequency amplifiers, low frequency amplifier circuits, descriptions of low frequency amplifiers: 34 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

Triple Differential Receiver AD814 15.04.2005

ANALOG DEVICES introduced the AD8143 Triple Differential Receiver, a compact, single-chip solution for receiving differential signals over twisted pairs up to 10 V and outputting a unipolar signal. The chip is designed to accept a tri-color RGB (red, green, blue) signal with a resolution of up to 1600x1200 or less.

The AD8143 is paired with the AD8133 Triple Differential Signal Amplifier for twisted-pair signaling. The microcircuit is produced in the LFCSP-32 package with dimensions of 5x5 mm.

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