Various electronic devices. Schemes, articles of the Free Technical Library

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Various electronic devices. Schemes, articles, descriptions

Free library / Schemes of radio-electronic and electrical devices

Miscellaneous electronic devices

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Acoustic design of multi-way loudspeakers

Section Acoustic systems. The most widespread among foreign radio amateurs are two- and three-way acoustic systems. Often, to further improve the return at low frequencies, the loudspeaker case is equipped with a phase inverter. I use other techniques to improve the performance of loudspeakers with two and three signal frequency separation bands. Two-way loudspeaker with slot inverter. Typically, the inverter hole is rectangular in shape and is located slightly below the hole of the low-frequency driver. Since the bass reflex improves the sound only at low frequencies, where there is practically no radiation directivity, the location of the hole, as well as its shape, is not important for the normal operation of the bass reflex. The main thing is that its area should be equal to about half the area of the diffuser ... >>

TRAN-C converter

Section Radio reception. The proposed converter is the first in a series of TRAN converters. On its basis, the VHF converter described in [1] was developed, and much of what was said there is also true for the proposed converter. I consider it necessary to provide only additional information. The sensitivity of the converter is low, which implies the use of this converter only as an auxiliary one, used to check and adjust the equipment and for communication over short distances. The converter is quite broadband and allows you to transfer the entire two-meter range to the broadcasting VHF FM ... >>

Amplifier on the chip K174UN7

Section Transistor power amplifiers. Old design, but good quality. This is one of the simplest options for a low-frequency power amplifier using the K174UN7 chip. Output power 4,5W. The load can withstand up to 4 ohms. The microcircuit is Soviet, but finding it is not a problem. They are full of transistor TVs. The microcircuit should be installed on a small heatsink (All boards come with heatsinks, so this is not a problem either. But if you can’t find it already, you can use foreign analogues: TBA810AS and LA4420 (they are naturally more expensive) ... >>

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Articles on various electronic devices

Articles on various electronic devices; schemes of various electronic devices; descriptions of various electronic devices: 12 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 ... >>

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

Invisible wires 10.03.2002

The American firm "Decorp" proposes to replace the traditional "round" electrical wiring in the house, invented more than a hundred years ago, with flat conductors of the type that are widely used in modern electronics.

The company launched the production of flat cables for power wiring (a cable for 15-20 amperes and 110-220 volts has the thickness of a business card), as well as telephone and antenna cables (thick as newsprint). Flat wires can be laid anywhere on the wall, and then covered with paint or wallpaper. Special sockets and switches have been developed for flat wiring.

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