Converter for VHF receiver up to 900 MHz. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Schemes of radio-electronic and electrical devices

Converter for VHF receiver up to 900 MHz. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / radio reception

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Converter for VHF receiver allows you to listen to the range up to 900 MHz.

The frequency is determined by the L3C4 circuit.

Converter for VHF receiver up to 900 MHz. Scheme

Publication: N. Bolshakov, rf.atnn.ru

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Random news from the Archive

Gold nanoparticles were synthesized using mimioza 22.07.2017

An international team of researchers has learned how to synthesize gold-containing nanoparticles using bacteria that live inside the bashful mimosa (Mimosa pudica).

The resulting compounds have pronounced bactericidal properties. According to the authors of the study, their work can be useful for creating new drugs that fight antibiotic-resistant bacteria.

"The present study proposes a fast and environmentally friendly method for the synthesis of gold-containing nanoparticles using the new symbiotic bacterium Aneurin Bacillus migulanus 14, which lives in bashful mimosa. The effectiveness of the new substance in combating pathogens is shown by the example of a significant reduction in the activity of the pathogen Pseudomonas aeruginosa," says in an article published in the journal Environmental Toxicology and Pharmacology.

Due to the widespread use of antibiotics, there are now more and more drug-resistant microorganisms in the world, so people are looking for new ways to fight bacteria. Studies show that various metal nanoparticles, especially those containing silver and gold, have strong antibacterial properties. But, unfortunately, the chemical synthesis of such compounds is not only very expensive, but also unsafe, since it involves the use of toxic elements hazardous to human health and the environment.

In the new work, the synthesis process itself using the bacterium Aneurin Bacillus migulanus 14 was a multi-step process, but after optimization by the researchers, it can be completed in as little as 20 minutes. At the same time, the synthesis does not require high temperatures, complex and expensive equipment, or the use of toxic reagents.

The researchers tested the antimicrobial activity of the new compounds against a series of pathogenic bacteria. As a result, it turned out that gold helps very well against various infections. Nanoparticles coped best with Pseudomonas aeruginosa P. Aeruginosa, Escherichia coli E. Coli, Staphylococcus aureus S. aureus, hay bacillus B. Subtilis, and Klebsiella pneumoniae K. Pneumoniae.

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