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Radio reception. Schemes, articles, descriptions

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radio reception

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Power supply indication unit



Section Power supplies. The Rh resistor is needed for the constant glow of the H HG2 segment, or rather a comma. The IN input is fed through a 3,5M resistor (in the author's version, these are two resistors with nominal values ​​of 2,4M and 1,1M) voltage from the output of the power supply. The display unit is powered by a stabilized voltage of 9V. Resistor R5 is multi-turn, type SP5. Its case is glued to the board with MOMENT glue and connected with a flexible wire to the R5 points on the board. LED indicators type ALS321A (common cathode) ... >>

The last of the Mohicans ...



Section Radio reception. It seemed that the time of regenerative receivers had sunk into oblivion, and sunk a very, very long time ago, somewhere in the late sixties. That is why it was completely unexpected for many that a few years ago a factory-made regenerative receiver appeared on the American market. It was, apparently, the last of the Mohicans ... which spurred interest in such devices for some time. ... >>

Using an optocoupler in a telephone ringer



Section Telephony. Using an optocoupler to transmit the ringing signal to a separate ringer prevents overloading the telephone line, avoids misunderstandings with the telephone company, and keeps the line receiving the signal alive. By means of an optocoupler, other devices can also be switched on, such as a telephone message recorder. The ringer draws 10 mA of ringing current and almost no load on the line on DC voice signals. ... >>

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Articles on radio reception

Articles on radio reception; diagrams of devices for radio reception; descriptions of devices for radio reception: 299 articles

 


 

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

A New Type of RF Power Amplifier for Mobile Phones 19.01.2004

AGILENT TECHNOLOGIES has introduced a new type of RF power amplifier for mobile phones with increased efficiency.

ASRM-7813 and ASRM-7833 microcircuits are produced in 4x4x1,1 mm packages for surface mounting and operate in the frequency ranges of 800 and 1900 MHz. ASRM-7891 chip is designed for GSM/GRPS mobile phones and has dimensions of 6x12x1,8 mm.

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