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Automobile. Security devices and alarms. Schemes, articles, descriptions

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Automobile. Security devices and alarms

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Experimental antenna for the 144 MHz band

VHF Antenna Section. The experimental antenna (EA) described below exacerbated another problem of electromagnetic compatibility of communication means - the problem of suppressing the image channel of radio receivers. When experimenting with an EA and a transmitter with an output power of 2 W in the city, there were complaints from a professional-commercial organization about interference from side-frequency radiation. A subsequent check with a scanning receiver in the specified frequency range (145 MHz) near the transmitter did not give a result. The previous work for two years at the same place and with the same equipment did not cause any complaints, and there was only one difference - the other antenna: before the incident - a double square, then - the described EA ... >>

How to search for historical and military relics

Section Metal detectors. The category of historical relics includes numerous items - traces of the life of our ancestors. It can be jewelry and crosses, and various household items - locks, keys, tools, knives, fish hooks, belt pads, buttons, weights, etc. Historical relics also include items associated with ancient wars and battles - arrowheads and spears, sabers, swords, daggers. Material traces of recent wars, apparently, should be called military relics or military souvenirs. These are helmets, firearms and their parts, flasks, soldier's canisters and tokens, awards, safes, tanks, planes, etc. ... >>

Network timer with a delay of 5 minutes

Section Clocks, timers, relays, load switches. This circuit, based on the IC 555, will supply power to the load for a time interval of up to 5 minutes depending on the setting of potentiometer R1. It should be noted that the transformerless power supply unit of the circuit consists of capacitors C1 and C2 and diodes D1 and D2. The time intervals of this timer are 0-5 minutes or a little more, the required interval is determined by the charge of the capacitor C3 through the potentiometer R1, the resistance of which can be adjusted. In order to supply AC power to the load, the circuit uses a triac instead of a relay. In the power node of the IC, the capacitance of the capacitor C1 limits the current, while no heat is generated (the device does not heat up) ... >>

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Articles on car security devices and car alarms

Articles on automobile security devices, car alarms; diagrams of automobile security devices, car alarms; descriptions of car security devices, car alarms: 63 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

Women age earlier than men 03.03.2017

American scientists in the course of the study found that women begin to age earlier than men. This is a kind of "retribution" for a longer life expectancy.

In particular, experts believe that women go through the period of the active phase of life faster than men - at this time a person has no serious health problems, he is efficient, and his vitality and ability to perceive information are at the highest level. In time, this segment of life lasts several decades.

According to scientists, women feel the advent of old age several years earlier than men, namely, they feel the loss of vitality and youth, and they also begin to have serious health problems.

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