Filters and matching devices. Schemes, articles of the Free Technical Library

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Filters and matching devices. Schemes, articles, descriptions

Free library / Schemes of radio-electronic and electrical devices

Filters and matching devices

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Radio output stage

Section RF power amplifiers. Below are two output stages for FM radio stations, proven in practice. Figure 1 shows a diagram of a transistor power amplifier. The amplifier is shown without a P-loop, which you can calculate yourself. If the PA is used at frequencies close to 27 MHz, then the P-loop data can be taken from [1]. Figure 2 shows the arrangement of parts in the housing. Installation is carried out on patches ... >>

Battery charger, 2,5 amps

Section Chargers, batteries, galvanic cells. This battery charging current source is capable of delivering up to 2,5A with up to 96% conversion efficiency. It can run on AC adapter or car battery. The device does not affect the ground resistance of automotive electrical equipment, since the charge current is measured in the positive rail. The charger works with batteries containing 5 to 15 cells, and its input voltage can be from 28 V to a level that is only 1,5 V more than the voltage at the poles of a fully charged battery. Charging current is generated by IC1, a current mode stabilized buck-switch converter controller operating with an external power switch (Q1 transistor) and a synchronous rectifier (Q2 transistor) ... >>

Triac power controller

Section Regulators of current, voltage, power. In triac power controllers operating on the principle of passing a certain number of current half-cycles through the load per unit time, the parity condition for their number must be met. In many well-known amateur radio (and not only) designs, it is violated. Readers are offered a regulator that is free from this shortcoming. Its scheme is shown in Fig. 1 ... >>

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Articles on filters and matching devices; schemes of filters and matching devices; descriptions of filters and matching devices: 49 articles

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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

External hard drives for social media users 19.06.2012

The new hard drives allow one-button backup of photos and videos stored on Facebook and Flickr. Seagate Technology has introduced a new line of external hard drives - Backup Plus. The new drives are the first on the market designed to automatically back up user photos and videos stored on Facebook and Flickr, according to the manufacturer's press service.

"It's an interesting idea to back up photos and videos stored on social networks to a local device. I think this will help people understand the benefits of storing multiple copies of content, regardless of where it is originally located," commented Brett Sappington ( Brett Sappington, director of research at Parks Associates, "Social media has been playing the role of a huge repository of personal digital content for some time now, and most users don't think they can lose that data."

More than half of Americans (54%) have experienced a file loss or have a friend who has lost information, according to a survey commissioned by Harris Interactive for Seagate in late May. More than a quarter (27%) of those surveyed lost personal files. Moreover, of all respondents, only 11% regularly use reservations.

When using Backup Plus hard drives, backing up photos and videos from Facebook and Flickr is done at the touch of a button using the included Seagate Dashboard software. The same software allows you to upload content from your hard drive to the Internet, as well as make backup copies of files stored on a personal computer to which the drive is connected.

The Seagate Backup Plus lineup includes 2,5GB, 500GB, and 750TB 1-inch pocket models with MSRPs of $120, $130, and $140, respectively, and 3,5TB, 1TB, 2TB, and 3TB desktop models (4 inches) priced at $130, $150, $180, and $250 respectively for Windows computers. Macs are available in 500GB and 1TB mobile models for $120 and $140, and 2TB and 3TB desktop models for $190 and $210, respectively.

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