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Beginner radio amateur. Schemes, articles, descriptions

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Beginner radio amateur

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Automatic pump shutdown

Section House, gardening, hobby. Radio magazine has repeatedly described various designs for automatically controlling a water pump, for example, devices that monitor the level of water either in its source, or in a receiving tank, or in both places. Sometimes it is more convenient to start the pump manually, and assign only the functions of monitoring the overflow of the tank to the machine. In the published article, the author proposes two simple variants of such an automaton. The circuit of the machine is quite simple if you use a float water level sensor (Fig. 1). When the receiving tank is not full, the contacts of the SA1 sensor are open. After pressing the SB1 button, the mains voltage is supplied to the pump motor M1 and through the capacitor C1 and the rectifier bridge VD1 to the winding of the electromagnetic relay K1. The relay is activated and with its contacts K 1.1 blocks the contacts of the button SB1 ... >>

hidden wiring finder

Section Indicators, detectors, metal detectors. A relatively simple finder made on three transistors will help determine the location of the passage of hidden electrical wiring in the walls of the room (Fig. 2). A multivibrator is assembled on two bipolar transistors (VT1, VT3), and an electronic key is assembled on a field transistor (VT2). The principle of operation of the finder is based on the fact that an electric field is formed around the electric wire - it is caught by the finder. If the switch button SB1 is pressed, but there is no electric field in the zone of the antenna probe WA1 or the finder is far from the mains wires, the transistor VT2 is open, the multivibrator does not work, the HL1 LED is off. It is enough to bring the antenna probe connected to the gate circuit of the field-effect transistor to a conductor with current or just to the mains wire, the transistor VT2 will close, the shunting of the base circuit of the transistor VT3 will stop and the multivibrator will come into action. The LED will start flashing. By moving the antenna probe near the wall, it is easy to follow the lodging of network wires in it. ... >>

TV auto bass video input

Section Television. When watching video cassettes, the VCR can be connected to the TV via the antenna input, or you can use the low-frequency (LF) video input on the TV. In the first case, a double conversion of the video signal occurs. In the tape recorder, the video signal is converted to high-frequency, and in the TV the reverse conversion takes place. As a result, distortions are introduced into the signal and the level of noise increases, which is noticeable in the quality of the image on the TV when watching video cassettes. ... >>

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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

thinness gene 01.06.2020

The genetic sequence of ALK (anaplastic lymphomakinase) turned out to be the thinness gene, which scientists have been looking for for quite some time. It is ALK that plays a key role in maintaining harmony.

European scientists, led by Dr. Josef Penninger from the Institute of Natural Sciences, compared the genetic parameters of 47 thousand slender people, and found that they are united by a special mutation in the ALK gene. Until now, scientists have not fully understood what exactly anaplastic lymphomakinase does in the human body - existing studies have shown that the gene may only be a factor in the development of certain types of cancerous tumors.

"Our study shows that the ALK gene is active in brain cells, where it is responsible for regulating metabolism. It is, quite simply, a regulator of energy expenditure," said Michael Orthofer from the Institute of Molecular Biology in Vienna, one of the lead authors of the project.

The scientists deactivated the ALK gene in model mice and observed how rodents that ate the same amount of food as animals from the control group gained markedly less weight in general and fat in particular. The authors of the work are confident that in the foreseeable future anti-obesity drugs will be created that directly affect the synthesis of ALK.

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