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Quartz filters. Schemes, articles, descriptions

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Regulated bipolar power supply, 12/6 volts 2 amps



Section Power supplies. In the laboratory of a radio amateur, as a rule, there is an adjustable stabilized power supply. By adding a simple prefix to it, you can get a bipolar power source. A diagram of such a prefix is ​​shown in the figure. It is designed to work in conjunction with a stabilizer with an output voltage of 12 volts and a load current of 2 A. The set-top box is equipped with a transistorized power amplifier, which made it possible to increase the efficiency of the device when the load resistance changes over a wide range. The ratio of the output voltages of the source can be changed within 0,6 ... 1,6 with a variable resistor R2. With a ratio equal to 1, the maximum load current of each arm is 2 A, while at extreme values ​​it should be reduced by 1,5 ... 2 times. The prefix works like a voltage stabilizer with a regulating element connected in parallel ... >>

Metal detectors TR-IB (Transmitter Receiver - Induction Balance), theory



Section Metal detectors. Recently, metal detectors TR-IB (Transmitter Receiver - Induction Balance), or simply TR, which are based on the principle of reception and transmission, have been especially popular. In such devices, called balanced metal detectors, the coil system is balanced to zero mutual inductance. The main feature of TR-IB devices is that it is not the reflected signal of the transmitter that enters the receiving coil, but the signal, the source of which is eddy currents excited on the surface of a metal object. ... >>

Digital frequency converter



Section Digital technology. Pulses with a stable repetition rate are usually formed from a crystal oscillator signal using a divider that lowers its frequency by the required (mostly integer) number of times. However, there are frequent cases when, due to the lack of the required quartz resonator, the ratio of the initial and required frequencies is not integer, and then it is necessary to use dividers with a fractional conversion factor [1, 2]. True, the period of oscillations they form is not constant, but in some devices this does not matter. ... >>

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Articles on quartz filters

Articles on quartz filters; circuits of quartz filters; descriptions of quartz filters: 12 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

Liquid writing technology 22.10.2023

German scientists from the Technical University of Darmstadt and John Gutenberg University have presented innovative technology that allows the creation of durable images in a liquid medium. Based on the principles of diffusion and osmosis, this method opens up new perspectives for the technology of writing and drawing in liquids.

The researchers used the liquid mixture as an alternative to paper, where a low concentration of charged ions and large colloidal particles replace traditional ink. A small ion exchange bead that can replace large charged particles becomes a writing pen.

The process of rotating a liquid using gravity allows researchers to create different patterns and images. The moving liquid, carrying colloidal particles along with it, forms visible lines and images in the trace of the ion exchange pen.

The experiment was carried out using silica particles dissolved in water, but scientists are continuing research to develop alternative materials for "paper" and "ink", as well as improving pen control mechanisms for writing in liquid.

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