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Transistor power amplifiers. Schemes, articles, descriptions

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Transistor power amplifiers

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Power supply with digital indication of voltage and current, 220/0-30 volts 5 amperes



Section Power supplies. The described power supply is designed for use in an amateur radio laboratory. Despite the fact that many circuits of such devices were printed in amateur radio literature, this power supply is not picky about specialized microcircuits and imported elements. At present, the issue of acquiring chips is still relevant, and in some regions it is problematic to get them. This power supply is an upgrade to the power supply described in ( II ). The power supply is assembled only from available parts ... >>

The principle of operation of the metal detector



Section Metal detectors. The dynamic mode of operation provides for the continuous movement of the search head (coil). The reaction of the device will be observed only when the head is passed over the metal. If the head is stopped over an object, the reaction will disappear. Static mode of operation is a mode in which the response of the device will be maintained while the head is above the object. It doesn't matter if it moves or not. Pseudo-static mode of operation - dynamic mode with very slow threshold adjustment. That is, if the head is held over an object for a long time, the device will adjust to this object and the reaction will disappear. When the head moves away from the object, a reverse adjustment of the same duration will begin. In computerized devices, the microprocessor controls the threshold adjustment processes, so the adjustment speeds when approaching and moving away from the object can be different. ... >>

Another power supply for the Chizhevsky chandelier



Section Electronics in medicine. Most devices designed to produce high voltage that feeds the Chizhevsky Chandelier can be divided into transistor voltage inverters and trinistor (and sometimes thyristor, since they use varieties of this group: dinistors, trinistors, triacs) pulse converters. The disadvantage of the former is the need to lower and rectify the mains voltage, which increases both the cost and the dimensions of the device. Trinistor devices [1 - 3] are relatively simple, which is the main argument in their favor. As a rule, trinistor devices operate on the principle of a half-wave arrester (Fig. 1) ... >>

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Articles on transistor power amplifiers

Articles on transistor power amplifiers, transistor power amplifier circuits, descriptions of transistor power amplifiers: 229 articles

 


 

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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 ... >>

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Random news from the Archive

80 terabyte hard drives 17.02.2020

Drive platter manufacturer Showa Denko has announced that it has developed a technology that will allow the production of 70-80 TB HDDs.

To date, conventional hard drives are as close as possible to the mark of 20 TB. If you look at the current plans of the major players in this market, you can see that, thanks to HAMR technology, we can get 2026 TB drives in 50.

However, the company Showa Denko, which produces magnetic drives for drives, announced that it had developed a technology that would allow the production of HDDs with a capacity of 70-80 TB!

It is based on the same HAMR technology, but Showa Denko proposes the use of thin films of a magnetic alloy (Fe-Pt), a new structure of magnetic layers, as well as new methods of temperature control during production. As a result, it is possible to achieve several times higher coercive force than modern solutions, with a small crystal grain size.

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