Menu English Ukrainian russian Home

Free technical library for hobbyists and professionals Free technical library


Calls and audio simulators. Schemes, articles, descriptions

Free library / Schemes of radio-electronic and electrical devices

Calls and audio simulators

We recommend reading in our Free Technical Library:

Nine band KB antenna



HF Antenna Section. This antenna is a variation of the well-known multi-band WINDOM antenna - a dipole, in which the feed point is off-center. In this case, the input impedance of the antenna in several amateur KB bands is approximately 300 ohms. which allows using both a single wire and a two-wire line with the corresponding characteristic impedance as a feeder, and, finally, a coaxial cable connected through a matching transformer ... >>

Transistor converter at 144 MHz



Section Radio reception. The requirements currently placed on VHF sports receiving equipment are quite contradictory. To achieve maximum sensitivity, it is necessary to ensure the lowest possible noise figure. At the same time, the receiver must have a wide dynamic range and low crosstalk distortion so that it can operate in conditions of interfering signals from nearby powerful radio stations. That's why. on the one hand, one cannot strive to obtain a large RF gain; on the other hand, the gain must be such that the proportion of noise introduced by the mixer into the total noise figure is insignificant. Gain adjustment by changing the emitter current of the RF amplifier and mixer cannot be introduced, because the lowest cross-distortion coefficient corresponds to a strictly defined emitter current ... >>

Refinement of imported telephone sets



Section Telephony. It is proposed to improve the calling part of imported telephone sets (FeTap, Siemens, TriTel, Philips) and adapt them to coordinate exchanges. On the automatic telephone exchange of the coordinate system of the ATSK-100/2000 type, with a ringing signal (ringing), these devices either do not ring at all, or slightly ring during the action of the inductor voltage. It turned out that if the frequency of the inductor is below 30 Hz, these devices do not ring. And the frequency of the inductor at ATSC is 25 Hz. When studying the calling part of the TA, it turned out that all these devices contain a calling chip of the SAA1092-2 type or its analogue from Telefunken U4076B ... >>

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

Articles on Calls and Audio Simulators

Articles on calls and audio simulators; call schemes and audio simulators; descriptions of calls and audio simulators: 79 articles

 


 

All articles on consumer electronics

 


 

Latest news of science and technology, new electronics:

Using Apple Vision Pro during surgery 16.03.2024

The medical team at Cromwell Hospital in London used Apple Vision Pro for the first time during two spinal surgeries. This event confirms the headset's potential as a medical tool that will change the way surgical practice is performed. Although the doctors themselves did not use Vision Pro, the operating room nurse worked with virtual reality using glasses while preparing and performing procedures. The headset made it possible to view virtual screens in the operating room, select instruments and monitor the progress of the operation. Software developed by eXeX, a company that specializes in creating artificial intelligence-based applications for surgery, has significantly improved the patient care process. Using Apple Vision Pro opens up new opportunities for developing healthcare applications such as clinical education, surgical planning, training and medical imaging. Implementation of Apple Vision Pro in the medical industry ... >>

Carbon storage in the North Sea 16.03.2024

Norwegian Energy Minister Terje Åsland has announced the launch of the Longship project, which aims to create a central carbon dioxide storage facility in the North Sea. This ambitious project is valued at $2,6 billion and aims to apply CCS (carbon capture and storage) technology to mitigate the impact of climate change. Norway already has experience in CCS, thanks to the successful Sleipner and Snohvit projects, and is now looking to increase the amount of carbon sealed beneath the seabed. Longship's plan calls for capacity to capture and store 1,5 million tons of carbon annually over 25 years. Despite the positive outlook, there are concerns about the long-term consequences of such storage. However, proponents of the project argue that offshore carbon storage has a number of advantages, including minimal environmental impact. The Longship project is carried out with the participation of Equinor, Shell and TotalEnergies through the joint venture Northern Li ... >>

Mini-organs grown from human amniotic fluid 15.03.2024

An international team of scientists led by Professor Fan Xiulin from Zhejiang University has developed a unique method of growing mini-organs from cells found in human amniotic fluid. This significant medical breakthrough could lead to improved diagnosis and treatment of congenital diseases. The organoids, which are three-dimensional cellular structures that mimic organs on a smaller scale, were grown from lung, kidney and small intestine cells found in amniotic fluid. This method opens up new possibilities for studying various fetal conditions and may be the key to early diagnosis and treatment of birth defects. Although no treatment has yet been attempted, the scientists hope their research will help combat the serious congenital diseases that affect millions of newborns each year. This breakthrough could change medical interventions by making it possible to diagnose and treat congenital diseases. ... >>

Random news from the Archive

60-inch LCD TVs from Foxconn and Sharp 08.10.2012

Announced in early August this year, the production alliance between Foxconn Electronics and Sharp is becoming more and more real. Taiwanese industry sources say the companies have begun joint development of 60-inch LCD TVs, with first batches expected by the end of October.

According to available information, the production of television panels will be occupied by Sharp's 10G generation plant. The estimated cost of devices, which, by the way, will be supplied to the market under the SIO brand, will be $1000 for the North American market, $1265 for the Chinese market and $1300 for the Taiwan market. Despite the release scheduled for October, mass production of products will not begin until the first quarter of 2013.

This decision will play into the hands of not only the group's members, but will also have a favorable impact on the large LCD TV market: manufacturers of the currently most popular devices with a diagonal of 32 and 42 inches will be forced to start reducing prices. Companies offering 60-inch models will not be left behind. First of all, we are talking about LG Electronics and Samsung, which, according to experts, will have to share their market share in the world market with the brainchild of Foxconn-Sharp.

Other interesting news:

▪ Face recognition for lending in Sberbank

▪ Pocket DNA Sequencer

▪ Motorola MOTOTRBO SL1600 digital portable radio

▪ Salt price

▪ Women's and men's depression differ in genes

News feed of science and technology, new electronics

 

Interesting materials of the Free Technical Library:

▪ site section Power regulators, thermometers, heat stabilizers. Article selection

▪ article Raven settlement. Popular expression

▪ article Why do we need hormones? Detailed answer

▪ article Application of metal coatings, cleaning parts with solvents. Standard instruction on labor protection

▪ article High-frequency current indicator on the cable sheath. Encyclopedia of radio electronics and electrical engineering

▪ article Miracle burner. Encyclopedia of radio electronics and electrical engineering


All languages ​​of this page

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

www.diagram.com.ua

www.diagram.com.ua
2000-2024