Color and music installations, garlands. Schemes, articles of the Free Technical Library

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Color and music installations, garlands. Schemes, articles, descriptions

Free library / Schemes of radio-electronic and electrical devices

Color and music settings

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Power amplifiers (without power transformer)

Section RF power amplifiers. The ULF circuit (Fig. 1) is known as a transformer. Its peculiarity is in the absence of a power transformer. The anodes of the lamps are powered from the 220 V network according to the voltage doubling scheme and Ua-k \u620d 220 V. The glow of the lamps is from the 6 V network through the current-limiting capacitor C1. As Tr2, Tr5, you can use power transformers from old tube radios with a midpoint in the secondary winding (as a rule, kenotrons of the 4Ts5S, XNUMXTsZS, etc. type were installed in them). The network winding of these transformers is used as a high output when working in line for subscribers, the filament winding is used as a low-resistance output ... >>

Practical acquaintance with a digital microcircuit

Section Beginner radio amateur. In a variety of instruments and devices of digital technology, designed by radio amateurs, the K155LAZ chip is most widely used. We believe that practical acquaintance with microcircuits of this series should begin with it. The appearance and symbolic graphic designation of this microcircuit is shown in fig. 1. Structurally, it is a rectangular plastic case with 14 plate leads (some microcircuits of this series have 16 or even 24 leads) located along both long sides of the case. On top of the case there is a conditional key - a small round mark indicating the location of pin 1. The rest of the pins are counted from it ... >>

Intercom on the network 220 V

Section Telephony. The use of this type of device justifies itself when negotiating within the same house or neighboring houses, because It is impractical to use a radio station at such distances, and telephones are now paid for by the minute. The principle of operation of these devices is based on the fact that electromagnetic oscillations with a frequency of 10 kHz to 100 kHz can be transmitted through the wires of the electrical network, and they can easily propagate to the nearest transformer ... >>

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Articles on color and music settings, garlands

Articles on color music devices and garlands; schemes of color music devices and garlands; descriptions of color music devices and garlands: 110 articles

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 ... >>

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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 ... >>

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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

Solar rooftops of the British Isles 19.09.2004

To promote new energy, British scientists have built several houses with solar panels on the roofs.

Through a project funded by the UK Department of Trade and Industry, Dr Abu-Bakr Bahaj from the University of Southampton has fitted nine new homes with solar panels. During the day, they provided the main part of the electricity, and additional power was supplied from the city network.

As it turned out, if you use 80% of solar electricity, you can save 132 pounds per year of those 250-500 pounds that the British pay for electricity. True, for this, the inhabitants of the experimental houses had to change their lifestyle somewhat: turn on such energy-hungry appliances as a washing machine and dishwasher at the height of the day.

"Energy bills are a constant headache, especially for the poor," says Dr. Bahaj. "Solar panels will be a good help in reducing these costs as part of the government's program to combat energy poverty."

"Hopefully the project will not be a one-time show, but will serve as an example of how, with a little brain power, you can bring the house in line with the principles of sustainable development," says Paul Hemmling, who is in charge of energy at the local council. "We were happy to be part of the promotion of new ways to save energy," echoes John Fifield of the construction company.

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