Various components of amateur radio equipment. Schemes, articles of the Free Technical Library

FREE TECH LIBRARY
Free library / Schemes of radio-electronic and electrical devices

Various components of amateur radio equipment. Schemes, articles, descriptions

Free library / Schemes of radio-electronic and electrical devices

Various components of amateur radio equipment

We recommend reading in our Free Technical Library:

Multiband vertical antenna

HF Antenna Section. Vertical antennas have long attracted shortwave antennas by the ability to receive radiation at a low angle to the horizon at a low antenna installation height, as well as by an almost circular radiation pattern in the horizontal plane. In addition, such antennas, which take up relatively little space, are convenient if the radio amateur cannot find sufficiently remote and high antenna suspension points. Vertical antennas, of which the Ground Plane is the most common, are usually designed to operate in one band, especially if tuned elements are used to match the antenna with the feeder ... >>

car anti-theft system

Section Security and car alarm. On the basis of only two cheap integral timers of the type 555 (KR1006VI1), it is possible to assemble an inexpensive car anti-theft system. Its schematic diagram is shown in the figure. Integral timer A gives the shutter speed necessary for the driver, getting into the car, to have time to turn off the anti-theft system. This eliminates the need for an external system switch. The thyristor prevents the timer B from tripping, except from the sensor-switches located at the vulnerable points of the machine ... >>

Two-stage AF amplifier on transistors of the same structure

Section Transistor power amplifiers. Two-stage AF amplifier on transistors of the same structure. Here, a direct connection between the cascades is also used, but the stabilization of the operating mode is somewhat different from previous designs. Assume that the collector current of transistor VT1 has decreased. The voltage drop across this transistor will increase, which will increase the voltage across the resistor R3 included in the emitter circuit of the transistor VT2. Due to the connection of the transistors through the resistor R2, the base current of the input transistor will increase, which will lead to an increase in its collector current. As a result, the initial change in the collector current of this transistor will be compensated ... >>

To any article in this section and all Encyclopedias you can leave your comment.

Articles on various components of amateur radio equipment

Articles on the nodes of amateur radio equipment; diagrams of various components of amateur radio equipment; descriptions of various components of amateur radio equipment: 38 articles

All articles on amateur radio components

Latest news of science and technology, new electronics:

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

The threat of space debris to the Earth's magnetic field 01.05.2024

More and more often we hear about an increase in the amount of space debris surrounding our planet. However, it is not only active satellites and spacecraft that contribute to this problem, but also debris from old missions. The growing number of satellites launched by companies like SpaceX creates not only opportunities for the development of the Internet, but also serious threats to space security. Experts are now turning their attention to the potential implications for the Earth's magnetic field. Dr. Jonathan McDowell of the Harvard-Smithsonian Center for Astrophysics emphasizes that companies are rapidly deploying satellite constellations, and the number of satellites could grow to 100 in the next decade. The rapid development of these cosmic armadas of satellites can lead to contamination of the Earth's plasma environment with dangerous debris and a threat to the stability of the magnetosphere. Metal debris from used rockets can disrupt the ionosphere and magnetosphere. Both of these systems play a key role in protecting the atmosphere and maintaining ... >>

Solidification of bulk substances 30.04.2024

There are quite a few mysteries in the world of science, and one of them is the strange behavior of bulk materials. They may behave like a solid but suddenly turn into a flowing liquid. This phenomenon has attracted the attention of many researchers, and we may finally be getting closer to solving this mystery. Imagine sand in an hourglass. It usually flows freely, but in some cases its particles begin to get stuck, turning from a liquid to a solid. This transition has important implications for many areas, from drug production to construction. Researchers from the USA have attempted to describe this phenomenon and come closer to understanding it. In the study, the scientists conducted simulations in the laboratory using data from bags of polystyrene beads. They found that the vibrations within these sets had specific frequencies, meaning that only certain types of vibrations could travel through the material. Received ... >>

Random news from the Archive

Editing of human embryos for the first time 27.07.2017

Oregon Health and Science University (OHSU) in Portland is the first in the United States to use technology that allows you to change genes in a human embryo.

The research involved modifying DNA in a large number of single-celled embryos using CRISPR gene-editing technology.

Although none of the embryos were allowed to develop for more than a few days - and there was never any intention of implanting them in the uterus - the experiments are a milestone in what may be the inevitable path to the birth of the first genetically engineered human.

By changing the DNA code of human embryos, scientists can remove or fix genes that cause hereditary diseases such as beta thalassemia. This process is called "germ-line engineering" because any genetically modified child will then pass the changes on to subsequent generations through their own germ cells.

Other interesting news:

▪ Titanium turtle jaw

▪ Seebeck magnetic effect

▪ New Large Can DirectFET MOSFET IRF6718

▪ Photosynthesis battery

▪ Sound stream localization creates the perfect signal

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Assembling the Rubik's Cube. Article selection

▪ article Bekhterev Vladimir. Biography of a scientist

▪ article Who, besides the artist Manet, painted the picture Breakfast on the Grass? Detailed answer

▪ Japanese quince article. Legends, cultivation, methods of application

▪ article The light turns off automatically. Encyclopedia of radio electronics and electrical engineering

▪ article Power supply / charger, 20 volts 5 amps. Encyclopedia of radio electronics and electrical engineering

All languages of this page

Home page | Library | Articles | Website map | Site Reviews