Menu English Ukrainian russian Home

Free technical library for hobbyists and professionals Free technical library


Mobile connection. Schemes, articles, descriptions

Free library / Schemes of radio-electronic and electrical devices

Mobile telephony

We recommend reading in our Free Technical Library:

Delay device for turning off the light in the car



Section Car. Electronic devices. The proposed device allows you to delay turning off the light after closing the door, which allows the driver to easily insert the key into the ignition at night. The scheme of the device is simple and does not require comments. It should only be noted that the VD1 diode is necessary to prevent the discharge of the capacitor through the alarm circuit if it is installed in the car and connected to the door buttons ... >>

Diode and bipolar transistor tester



Section Measuring technology. Most modern testers (multimeters) have built-in functions for testing diodes and sometimes transistors. But if your tester does not have these functions, then you can assemble a diode and transistor tester with your own hands. Below is a tester project based on the PIC16F688 microcontroller. The logic for testing diodes is very simple. A diode is a PN junction that is known to only conduct current in one direction. Therefore, a working diode will conduct current in one direction. If the diode conducts current in both directions, then the diode is inoperative - broken. If the diode does not conduct in either direction, then the diode is also not working. The circuit implementation of this logic is shown below. ... >>

Production of a transformer for radio equipment



Section Ham Radio Technologies. When manufacturing PAs, as well as any other devices, the problem of selecting a good transformer often arises. Basically, the following conditions are imposed on it: it is quite powerful and small-sized. Such requirements include only types of transformers that have become widespread among radio amateurs: transformers of the ShL, PL and O (toroid) brands. Let's focus on the smallest transformer of the toroid type, but the problem immediately arises of where to get the transformer iron strip from which such cores are made in the factory. A technology for manufacturing transformers from sheet transformer iron used in powerful oil-cooled transformer substations for voltages from 380 to 6000 volts or more is proposed. ... >>

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

Articles on mobile communications

Articles on mobile communications; schemes for mobile communications; descriptions of mobile communication devices: 114 articles

 


 

Cell phones. Expert Reviews

Do you remember how it all started? Mobile Legends...

 


 

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

The Pentagon is developing an orbital station 08.07.2019

The Department of Military Innovation (DIU) of the US Department of Defense announced a competition to develop an orbital station that could be used for experiments and cargo storage.

According to the list of requirements that the Pentagon makes to potential bidders, a promising orbital station must be suitable for space construction, microgravity experiments, training, testing, cargo storage and transportation, as well as for certain "other functions." As part of the tender, participants must design and build a prototype of a small robotic orbital station with a volume of one cubic meter.

A promising station should be suitable for handling cargo or any other payload weighing up to 80 kilograms. The onboard power supply must provide 1 kilowatt of energy, and the station's communication systems must provide data exchange at a speed of at least 100 kilobits per second. The competition will be held in several stages. First, we will talk about the development of the project of the station.

In 2020, the development and launch of prototypes of orbital stations should begin - from the moment a contract is signed to the launch of prototypes, according to the requirements of the military, no more than two years should pass. Prototypes should be assembled on a modular basis and provide for the possibility of subsequent upgrades. Among the functions of the station, the Pentagon also included the reception of people on board.

In addition, the station must be able to change orbit, perform work outside low Earth orbit, dock with other manned and unmanned spacecraft, and assemble other objects in orbit using one or more robotic arms.

Other interesting news:

▪ Dual Channel Isolated SiC MOSFET Drivers 2EDF0275F and 2EDS9265H

▪ The Botanical Institute of the Russian Academy of Sciences is entangled in the Internet

▪ Waterproof AC-DC adapters Mean Well OWA-90E

▪ Processor Intel Celeron 2,7 GHz

▪ Biopolymers vs. petroleum products

News feed of science and technology, new electronics

 

Interesting materials of the Free Technical Library:

▪ section of the site Signal limiters, compressors. Article selection

▪ article Rippers for tillage. Tips for the home master

▪ article What literary character Dumas was invented only to increase the fee? Detailed answer

▪ article Application of metal coatings when pickling metals. Standard instruction on labor protection

▪ article Troubleshooting algorithm when the RCD is triggered. Encyclopedia of radio electronics and electrical engineering

▪ article Device for protection of radio equipment from exceeding the mains voltage. 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