Computer devices. Schemes, articles of the Free Technical Library

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Computer devices. Schemes, articles, descriptions

Free library / Schemes of radio-electronic and electrical devices

Computer devices

We recommend reading in our Free Technical Library:

Power supplies for LCD and LED displays

Section Power supplies. Liquid crystal display (LCD) indicators and displays based on light emitting diodes (LED) can be operated from conventional power supplies. However, this is not the best way to supply power. Below will be shown options for switching on using specialized microcircuits - voltage regulators, which are produced by MAXIM ... >>

Photomechanical sensor

Section for radio amateur-designer. The photomechanical method of obtaining a slow-sweep television image is the most affordable for radio amateurs. Its essence lies in the progressive conversion of an optical image into an electrical signal, supplemented by horizontal and vertical sync pulses. The quality of the picture obtained in this case can be no worse than from an SSTV camera made on a vidicon. It depends mainly on the design of the mechanical part of the device, schematically shown in Fig. 1 ... >>

Stable transistor generator

Section Nodes of amateur radio equipment. Generators, heterodynes. The described master oscillator is designed to generate oscillations in the 10-meter amateur band. Frequency stability in the range of 28,0-29,7 MHz changes very little (deteriorating with decreasing frequency). It is generally accepted that the most stable quartz-free self-oscillators are tube ones. However, with an appropriate calculation of the self-oscillator circuit and full consideration of the specifics of the operation of the transistor in self-generation modes at RF, the stability of the circuit can be obtained, which differs little from the circuits on lamps. The circuit used by the author (see figure) is a self-oscillator with capacitive coupling, which is the most rational in terms of design ... >>

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Articles on computer devices

Articles on computer devices; diagrams of computer devices; descriptions of computer devices: 98 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

Portable camera with support for SD memory cards 10.01.2004

Deja View has released a portable camera Camwear Model 100 with support for Toshiba NAND Flash SD memory cards.

A compact digital camera is attached to clothes and constantly takes a panorama with a viewing angle of 60 degrees and saves it to the buffer. By pressing the record button, the last 30 seconds of video or audio are recorded to the removable storage. Video is saved at 320x240 pixel resolution in MPEG-4 30 frames per second format and saved to an SD memory card.

The Camwear Model 100 costs $400 and comes with a 64MB memory card, up to 512MB memory cards, and a 2000mAh Li-Ion battery. Phone-powder box Panasonic has released a mobile phone exclusively for ladies: the device at first glance strongly resembles an ordinary powder box.

The model was named G70 and, of course, does not pretend to be the most functional phone - there is not even support for the popular MMS service. But there is a function specifically for the fair sex: as soon as the backlight turns off, the screen turns into a mirror.

Note the characteristics of the G70: work in networks GSM 900/1800/1900 MHz; support for EMS, SMS and GRPS; polyphony for 16 voices; screen with a resolution of 128x96; talk time - 3...5 hours, standby time - up to 200 hours; dimensions - 88x60x27 mm.

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