Power amplifiers. Schemes, articles of the Free Technical Library

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Power amplifiers. Schemes, articles, descriptions

Free library / Schemes of radio-electronic and electrical devices

Power Amplifiers

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28 MHz portable radio

Section Civil radio communications. The direct conversion transceiver described in [1] made it possible at one time to begin intensive development of the 160 m range. It did not go unnoticed by foreign radio amateurs either - several adapted versions appeared in the radio magazines of the former socialist countries (unfortunately, in some cases without reference to the author) . For several years, I have been trying to modernize and rebuild this transceiver to other ranges. I hope the experience will be useful for beginners, for those who will assemble this simple but high-quality device. One of the upgrade options was given in [2]. There is no need to manufacture a printed circuit board for the transceiver with the dimensions given in [1]. As experience shows, all parts fit perfectly on a board 1,5 times smaller ... >>

phase trap

Section Protection of equipment from emergency operation of the network. In rural areas, there are constant problems with electricity. Fortunately, I have three phases connected to my house, which allows me to use the electricity network almost uninterruptedly. Three phases is of course very good, you can connect three-phase equipment like a lathe. But my joy was short-lived (it’s good that I didn’t have time to buy a three-phase machine). It turns out that in our village three phases are a very relative thing, since all three of them are extremely rare. It's good if there are two or one. Moreover, they disappear and appear very unpredictably, and since 220 V is taken from one phase, most houses also suffer from power outages. In my case, it is easier, because 220 V can be removed from at least one working phase. Initially, I had to do it manually. I installed three powerful single-phase sockets with neon lights on the shield to indicate the presence of voltage, connecting each to a separate phase, and removed the plug from the wiring of my house. The voltage is gone, you go into the hallway and switch the plug to an outlet where there is voltage ... >>

Frequency selectors

Section Reference materials. Piezoelectric filters (PEF) belong to selection devices and serve to isolate (suppress) a certain spectrum of oscillations ... >>

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Articles on power amplifiers

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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

The brain recognizes touch even outside the body 14.12.2019

A new study has proven that we can feel how an object in our hands comes into contact with something else as clearly as if it were part of our body.

Scientists have found that during the performance of simple, everyday operations, the human brain behaves extremely strange. When you pick up a stick and hit it on, say, a fence, a special set of neurons is activated. They help determine exactly what has happened through certain vibration patterns that run through our nervous system.

Of course, if the object in our hands touches something, we will feel it due to the difference in pressure. However, the new work shows that with the help of the amazing abilities of the brain, we can also accurately determine the location of the contact of an object and a surface - despite the fact that these are two completely alien objects for us.

The project was initiated by neurobiologist Luc Miller from the University of Lyon in France. In 400 different tests, Miller and his colleagues had 16 study participants hold wooden rods in their hands and asked them to determine when the tester touched them twice in places close to each other. The volunteers did surprisingly well: they could recognize two close touches 96% of the time!

The EEG scans that were taken during the study revealed amazing details. It turned out that to detect the zone of touch, the brain uses neural mechanisms that are almost identical to those that allow you to recognize touches on the body's own skin. Scientists believe that we can accurately determine the junction of two objects, as long as at least one of them continues to vibrate. According to the computer model, this happens in just 20 milliseconds.

The most striking example of such a connection in everyday life is blind people who literally “feel” the world around them with a cane, which allows them to navigate the terrain. But, of course, the main application of the data of the new study will be among engineers involved in the manufacture of prostheses. The better we can deceive our own brain, the more complete will be the illusion that instead of an artificial limb, a person uses a real one. Perhaps in the near future, neuroprostheses will become so perfect that even a person with a completely amputated limb will be able to experience at least part of the spectrum of tactile sensations thanks to mechanical augmentation.

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