Various computer devices. Schemes, articles of the Free Technical Library

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Various computer devices. Schemes, articles, descriptions

Free library / Schemes of radio-electronic and electrical devices

Miscellaneous computer devices

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Shortened 160m Antenna

HF Antenna Section. This antenna can be used in cases where there is not enough space to install a full-size dipole on a range of 160 meters. It should be noted that, using the calculated ratios given in this article, similar shortened antennas can be made for other amateur bands. The antenna is (see figure) a radiator of length A with an extension coil L1. This coil extends the emitter to the electrical length L/4, and the mast B and the ground fitting C of the building are used as ground. To increase the efficiency of the antenna, if possible, it would be good to install a shortened counterweight D with an extension coil L2. It is better if there are several counterweights ... >>

Conditional graphic and alphabetic designations of electroradioelements

Section Beginner radio amateur. Almost all UOS, all products of radio electronics and electrical engineering manufactured by industrial organizations and enterprises, home craftsmen, young technicians and radio amateurs, contain a certain amount of various purchased ERI and elements produced mainly by the domestic industry. But lately there has been a tendency to use ERE and foreign-made components. These include, first of all, PPP, capacitors, resistors, transformers, chokes, electrical connectors, batteries, HIT, switches, installation products and some other types of ERE ... >>

Frequency multiplier

Section Digital technology. For lovers of digital technology, a frequency multiplier device may be of interest, at the output of which the number of pulses is a certain integer number of times greater than the input. A diagram of such a device is shown in the figure. The input pulses U„ are fed to a shaper made on a DD1 chip. Regardless of the duration of the input pulses, short high-level pulses are formed at the non-inverting output (pin 6 of the DD1 microcircuit), the duration of which is determined by the parameters of the elements C1, R1 and the built-in resistance of the microcircuit (about 2 kOhm). The period of their repetition corresponds to the period of the input pulses ... >>

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Articles on various computer devices

Articles on various computer devices; diagrams of various computer devices; descriptions of various computer devices: 32 articles

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Latest news of science and technology, new electronics:

Artificial leather for touch emulation 15.04.2024

In a modern technology world where distance is becoming increasingly commonplace, maintaining connection and a sense of closeness is important. Recent developments in artificial skin by German scientists from Saarland University represent a new era in virtual interactions. German researchers from Saarland University have developed ultra-thin films that can transmit the sensation of touch over a distance. This cutting-edge technology provides new opportunities for virtual communication, especially for those who find themselves far from their loved ones. The ultra-thin films developed by the researchers, just 50 micrometers thick, can be integrated into textiles and worn like a second skin. These films act as sensors that recognize tactile signals from mom or dad, and as actuators that transmit these movements to the baby. Parents' touch to the fabric activates sensors that react to pressure and deform the ultra-thin film. This ... >>

Petgugu Global cat litter 15.04.2024

Taking care of pets can often be a challenge, especially when it comes to keeping your home clean. A new interesting solution from the Petgugu Global startup has been presented, which will make life easier for cat owners and help them keep their home perfectly clean and tidy. Startup Petgugu Global has unveiled a unique cat toilet that can automatically flush feces, keeping your home clean and fresh. This innovative device is equipped with various smart sensors that monitor your pet's toilet activity and activate to automatically clean after use. The device connects to the sewer system and ensures efficient waste removal without the need for intervention from the owner. Additionally, the toilet has a large flushable storage capacity, making it ideal for multi-cat households. The Petgugu cat litter bowl is designed for use with water-soluble litters and offers a range of additional ... >>

The attractiveness of caring men 14.04.2024

The stereotype that women prefer "bad boys" has long been widespread. However, recent research conducted by British scientists from Monash University offers a new perspective on this issue. They looked at how women responded to men's emotional responsibility and willingness to help others. The study's findings could change our understanding of what makes men attractive to women. A study conducted by scientists from Monash University leads to new findings about men's attractiveness to women. In the experiment, women were shown photographs of men with brief stories about their behavior in various situations, including their reaction to an encounter with a homeless person. Some of the men ignored the homeless man, while others helped him, such as buying him food. A study found that men who showed empathy and kindness were more attractive to women compared to men who showed empathy and kindness. ... >>

Random news from the Archive

The ozone hole must disappear 16.07.2019

The ozone hole prevents climate warming in the central and eastern parts of Antarctica.

Under the Montreal Protocol, a ban was established on the emission of freons and the transition to other gases. As a result, chlorine emissions are reduced. Ejected chlorine lives in the atmosphere for 50-70 years. Now we are seeing that it has become smaller. This led to the fact that if earlier the ozone hole expanded and "deepened" (became less ozone), now this process has slowed down: the size and "depth" are becoming smaller. According to the results of joint research by Ukrainian and Australian scientists, the ozone hole as a phenomenon should disappear by 2050-2070.

This was stated by Gennady Milinevskiy, Head of the Space Physics Laboratory of the Faculty of Physics of Taras Shevchenko National University of Kyiv, Senior Researcher at the National Antarctic Research Center. According to him, this is a seasonal effect, which leads to a decrease in the ozone layer from mid-August to the end of October. In November, the ozone layer is already recovering. In Antarctica, ozone has a maximum at an altitude of about 20 kilometers.

How is the ozone layer formed? The ultraviolet rays of the sun produce the dissociation of oxygen molecules, individual oxygen atoms combine with oxygen molecules and ozone molecules are obtained, consisting of three oxygen atoms. In the Antarctic in winter, the temperature in the stratosphere drops sharply - to -70 ... -80 degrees Celsius. At this time, the so-called polar stratospheric clouds with frozen nitrogen oxides and water are formed, and chlorine accumulates on the particles of these clouds. And he appeared in large quantities due to the production of freon, which was widely used in refrigerators.

Freon at the surface of the Earth is an absolutely stable neutral gas, but nevertheless it diffuses into the atmosphere, enters the stratosphere, where there is already more ultraviolet radiation, which breaks it up and releases a free chlorine atom. And one such atom kills a thousand ozone molecules. It turns out the reaction - O3 + Cl> ClO + O2. And ClO is freely destroyed, again a free chlorine atom appears, which again interacts with ozone and leads to its destruction. Thus, chlorine, one might say, "eats" ozone until it disappears from the stratosphere. And in winter, chlorine molecules get on the frozen particles of polar clouds, and their reservoirs are actually created, where they accumulate. The sun rises in late spring, and these clouds quickly melt in a day or two. It turns out a powerful release of chlorine, which "eats away" the ozone layer at the height of its maximum.

The most interesting thing, according to Milinevskiy, is that the ozone hole, which was actually created by man, throwing out freon, led to the creation of a stable fence of inner Antarctica from warm air masses, which prevents climate warming in the central and eastern parts of the ice continent. And in fact, the temperature there has not changed lately, but rather, it even drops a little.

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