Antenna amplifiers. Schemes, articles of the Free Technical Library

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Antenna amplifiers. Schemes, articles, descriptions

Free library / Schemes of radio-electronic and electrical devices

Antenna amplifiers

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Magnetic shielding of acoustic systems

Section Acoustic systems. Most speakers specifically designed for the center channel are shielded from magnetic interference, but when trying to use unshielded speakers or full-range floorstanders for the center, you can easily run into the problem of color spots on the TV screen. This effect is also possible if the front speakers are too close to the TV. Magnetic shielding of acoustics will help to get rid of this effect. ... >>

Resettable fuse, 5 amps

Section Protection of equipment from emergency operation of the network. A diagram of such a fuse with a maximum load current of 5 A is shown in fig. 7.19. Its efficiency exceeds 90% in more than a tenfold range of load current changes. The current consumed in the absence of load is less than 0,5 mA. To reduce the voltage drop across the fuse, a germanium transistor is used as VT4. When the load current is less than the allowable, this transistor is on the verge of saturation ... >>

Fire hazard of short circuits, overloads, large transient resistances

Electrical section. A short circuit can occur due to a violation of the insulation between the phase wires, the phase wire and the neutral wire of the network, or when the phase wire is shorted to metal structures that are connected to the ground, short to ground. A short circuit can be complete (metal) and incomplete. With a full circuit, the transient resistance at the place of the wire closure is insignificant, and it can be neglected. More often, an incomplete short circuit occurs, since in the places where the wires are shorted, a transition resistance appears due to loose contacts, the formation of an oxide film, and charring of the insulation. In the event of a metal short circuit, protection is triggered, which turns off the network. In case of an incomplete short circuit, the protection devices cannot work, resulting in a fire. A fire is possible even with the wrong choice of protection devices ... >>

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Articles on antenna amplifiers

Articles on antenna amplifiers; antenna amplifier circuits; descriptions of antenna amplifiers: 31 articles

All articles on antennas

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

Curly hair is a natural defense against the summer heat. 29.06.2023

Scientists from the University of Southern California (USA) found that people with curly hair tolerate heat better.

The researchers conducted a series of laboratory experiments on a human head model. While maintaining a temperature of 35 °C, corresponding to the warmth of the scalp, they irradiated the model with a heat lamp. The model had different types of hair: straight, slightly curly, very curly, as well as a model with a completely bald head. The skin was either dry or moist.

The results showed that thick curls provide the best protection from the sun. Under them, the artificial skin almost did not heat up. Scientists believe that our ancestors in Africa survived, including thanks to their curls: under the burning sun, thick curls helped ancient people retain water in the body longer.

"The results of the study do not surprise me. Curls protect the head not only from the scorching sun, but also from the cold. In addition, the scalp is better ventilated. Nowadays, in the summer, this is an ideal image not only for women, but also for men. curls, can consider himself lucky,” says stylist Maurice Klostermann from Berlin.

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