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Dosimeters. Schemes, articles, descriptions

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Power supply with microcontroller control, 0-25 volts

Section Power supplies. It consists of an indication and control unit, a measuring unit and a short circuit protection unit. Display and control unit. Indicator - LCD display based on the HD44780 controller, 2 lines of 16 characters. Voltage control is carried out by the PWM built into the controller. Its duty cycle is regulated by an encoder, each step of which leads to an increase or decrease in voltage by 0,1 volts at the PSU output. A full turn of the encoder is 2 volts. Since PWM can change the voltage on the storage tank only in the range from 0 to 5 volts, an op-amp with a gain of 5 is used. Thus, the actual voltage at the PSU output is regulated within 0 - 25 volts ... >>

Voltage doubling converter

Section Voltage converters, rectifiers, inverters. In amateur radio designs, there is often a need for several supply voltages, while the power supply produces only one, and reworking it is quite complicated. At low consumption currents, various voltage converters (multipliers) can be used. Many of them are complex and require expensive components. Compact and convenient pulse voltage converters. I propose my version of such a converter based on a simple and very popular type 555 timer integrated circuit (domestic analogue - KR1006VI1). The converter allows you to get two voltages from +5 V: +10 V and -5 V ... >>

Stabilizers on chips AMS1117хх

Section Voltage stabilizers. Микросхемы серий AMS1117, LD1117A, IL1117A (аналог К1254ЕНхх, завод Транзистор, Минск) представляют собой линейные стабилизаторы напряжения положительной полярности с низким напряжением насыщения, производятся в корпусах SOT-223 и ID-Pack. Выпускаются на фиксированные напряжения 1,2, 1,5, 1,8, 2,5, 2,85, 3,3, 5,0 вольт и 1,25 В регулируемый. Выходной ток микросхем до 1 А, максимальная рассеиваемая мощность 0,8 Вт для микросхем в корпусе SOT-223 и 1,5 Вт выполненных в корпусе D-Pack ... >>

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Articles on dosimeters

Articles on dosimeters; dosimeter schemes; descriptions of dosimeters: 22 articles



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

40" OLED panel for ultra-thin displays and TVs 12.06.2005

At the Society of Information Display 2005 International Symposium, Seminar and Exhibition, which opens next week in Boston, Samsung is due to present its new development - a prototype of a very thin 40-inch OLED (Organic Light Emitting Diode) panel. . Its thickness is 2,2 cm, so, according to Samsung, we should expect TVs no more than 3 cm thick after a while.

Recall that OLED displays are good, first of all, in that their power consumption is lower than that of traditional LCD displays due to the fact that they do not require backlighting. In addition, the image resolution on OLED displays is higher than on LCD displays. However, until recently it was not possible to make OLED displays large enough at reasonable prices, so for now they are being built into cell phones and other devices with small screens. But work on the creation of large OLED displays is quite active.

For example, the same company Samsung showed two prototypes last year: first with a diagonal size of 14,1 inches with a resolution of 1280 x 768 pixels, and then a 21-inch panel with a resolution of 1920 x 1080 pixels. True, the new 40-inch panel has a lower resolution - 1280 x 800 pixels. Among other characteristics, we note the brightness of 600 cd/m2 and the contrast ratio of 5000:1.

This prototype was made from a 730mm x 920mm glass blank using amorphous silicon and traditional LCD technology. That is, an important step has been taken in reducing the cost of producing OLED displays (previously, more complex and expensive technologies were used for this).

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