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144 MHz Band Power Amplifier



Section RF power amplifiers. The amplifier has been designed for use with most types of portable FM transceivers. With a transceiver output power of about 5 W, the amplifier produces approximately 18 W, which is quite sufficient for the vast majority of real-life situations. Any transceivers or transmitters that provide an output power of 3...6 W can work with this amplifier, and exceeding the maximum specified value is highly undesirable ... >>

Automatic Light day for household plots



Section Lighting. Homestead greenhouses play a significant role in the subsidiary farming. But a green cucumber or flowers for the holiday require a lot of work and skill. One of the main parameters for growing winter greens is lighting. So, for example, for a cucumber, daylight hours should be 16 hours, and for tomatoes - 18 hours [1]. In some greenhouses around the clock lighting is practiced. However, for the normal physiological development of plants, several hours of complete darkness are required. ... >>

Soldering aluminum at home



Section Ham Radio Technologies. Method 1. To solder two aluminum wires, they are pre-tinned. To do this, the end of the wire is covered with rosin, placed on a sanding skin (with a medium grain) and pressed with a hot tinned soldering iron to the sanding skin, while the soldering iron is not taken away from the wire and rosin is added to the tinned end all the time. The wire is tinned well, but all operations have to be repeated many times. Then the soldering goes in the usual order. Better results are obtained if mineral oil for sewing machines or alkaline oil (for cleaning weapons after firing) is used instead of rosin. ... >>

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Articles on acoustic systems

Articles on acoustic systems; acoustic system diagrams; descriptions of acoustic systems: 180 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

Google Stadia 18.07.2019

By releasing the Google Stadia project, the corporation plans to create a kind of Netflix for video games. In the app, games will be streamed to the user's device at the highest resolution of 4K, Ultra HD, High Dynamic Range (HDR), and 60 frames per second. In general, you no longer need an expensive high-end computer or game console. In the future, Google Stadia promises 8K resolution and over 120+ FPS.

Because games don't have to be downloaded to your own device, there's no need to worry about memory, installation, updates, or patches.

Google Stadia will also be integrated into the YouTube platform, making game streaming easier. In addition, additional features such as Crowd Play will be available, allowing you to directly connect to live streamers.

In November 2019, Google will launch Google Stadia in 14 countries. At the time of release, the service will offer reasonable prices and an excellent selection of games. The good news is that many Google Stadia features will be free to use at the Stadia Base tier, with some games purchased separately.

To get more features, you'll need the paid version of Stadia Pro, which will cost $9,99 per month. In this case, games from the Stadia database will be available on a subscription basis. Plus, with Stadia Pro, you get up to 4K resolution and 5.1 Surround Sound.

Google Stadia: release, price and available games Among the interesting releases: limited edition Stadia Founder's Edition for $129, already available for pre-order. It includes the Stadia Controller, Chromecast Ultra, three months of Stadia Pro access for you, and three more months for you to gift. Plus, with the purchase of the Founder's Edition, you'll be able to choose your exclusive gamertag before anyone else.

Google Stadia is designed to work on almost any device without sacrificing quality. The most important thing is a stable internet connection. At 29 Mbps, you can already play games at 1080p Full HD and 60 FPS. 4K resolution becomes possible already from 30 Mbps. Of course, you can also use a service with a slow connection. In this case, the resolution is reduced to, for example, 720p.

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