Power supply. Schemes, articles of the Free Technical Library

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Power supply. Schemes, articles, descriptions

Free library / Schemes of radio-electronic and electrical devices

Electric power supply

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Switching power supply on the LM2577 chip, 220 / 3,5-30 volts 0,2 amperes

Section Power supplies. Switching DC / DC power supplies are widely used due to their higher efficiency compared to linear ones. Although they are inferior to linear ones in less stable output voltage, with a significant change in the input voltage, less power is dissipated on them. A fairly wide range of various microcircuits is produced, on the basis of which it is possible to perform a similar task. This article discusses practical diagrams of two power supplies based on the LM2577T-AJI chip. ... >>

How GSM networks work, a brief basics of communication

Section Mobile communications. Almost everyone used a cell phone, but few people thought - how does it all work? In this literary opus, we will try to consider how communication takes place from the point of view of your telecom operator. When you dial a number and start calling, well, or someone calls you, then your device communicates via radio with one of the antennas of the nearest base station ... >>

Bug. Micro power radio transmitter

Section Telephony. Miniature micro-power radio transmitters (commonly known as bugs) are very popular among novice radio amateurs. After all, if a novice solderer heard his voice from the radio in the next room, this means that he has become a real radio amateur. The diagram of my bug is shown in Fig. 1a. The printed circuit board for it is designed to match the size of a matchbox, so there are no problems with the case ... >>

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Articles on power supply

Articles on power supply; power supply schemes, power supply descriptions: 8 articles

All articles for an electrician

Regulatory documentation for an electrician

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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 ... >>

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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

Smart pen with spell checker 06.08.2013

Young German entrepreneurs Falk Wolsky and Daniel Kaesmacher are planning to start serial production of the Lernstift pen, capable of checking spelling and putting beautiful handwriting, in six months.

Lernstift contains an embedded computer running a Linux kernel operating system, a motion sensor, memory, a Wi-Fi adapter and a vibration motor. The motion sensor, consisting of an accelerometer, a gyroscope and a magnetometer, has a resolution of 400 dpi. It scans the text that the user writes. Every second, the sensor is able to send data to the processor 200 times.

The computer has software installed that decrypts the data received from the sensor. The program was developed by "the world leader in optical recognition technology" Vision Objects and "has been tested on millions of tablets and smartphones around the world." The authors of the project turned to many third-party companies for help. For example, the design of the handle was developed by the design office ipdd from Stuttgart.

The program needs much less data than the sensor can provide - a resolution of 100 dpi is enough to recognize handwritten text, and 50 times per second is enough to receive data. The program is executed by the processor included in the computer built into Lernstift, which is equipped with 128 MB of RAM. The recognition rate of one character is 20 ms.

Lernstift can do two things. The first function is error checking. If the user makes a mistake in a word, the pen will automatically vibrate. The second function is handwriting improvement. The pen vibrates if the handwriting becomes illegible.

The Lernstift software is able to adapt to a person's handwriting. To calibrate the pen, the user needs to write a few words in block letters and then in italics. Based on these data, the program will further study the user's handwriting.

The Lernstift pen is intended to be used by children aged 5 years and older and adults of all ages. Pen nibs can be changed. Pens are planned to be produced in blue and pink colors - for boys and girls. And an open programming interface (API) will allow third-party developers to create various applications for Lernstift.

Lernstift can be connected to a computer, smartphone or tablet and save the text that is written with it. So you can save notes, or, for example, parents can check the progress of their child. Notes can be shared on Facebook and Twitter.

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