Amplifier with parallel connection of lamps in the output stage. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Tube Power Amplifiers
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Author: A. Shikhatov; Publication: bluesmobile.com/shikhman
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Latest news of science and technology, new electronics:
Machine for thinning flowers in gardens
02.05.2024
In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers.
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| Random news from the Archive Miniature efficient acoustic amplifier
25.07.2021
Scientists at Sandia National Laboratories have created what can be called the smallest and most efficient acoustic amplifier in the world. This amplifier is based on principles developed about five decades ago, but the latest advances in electronics and nanomanufacturing have made it possible to drastically reduce the size and increase the efficiency of the device by more than 10 times.
Radio signal amplifiers are used today in almost every device, be it a mobile phone or an electric kettle with the ability to access the Internet. Now traditional amplifiers are used to amplify radio signals, but for quite a long time there has been an idea that instead of a stream of electrons, high-frequency acoustic waves can be used.
The first acoustic amplifiers of radio signals appeared in the 70s of the last century. These were relatively large devices, the area of the chips of which reached one square centimeter, their operation required a high electrical potential of the order of 2 thousand volts, and during operation they generated a large amount of heat, which negatively affected the amount of energy consumed, which was 500 mW.
The new acoustic amplifier is a 276 MHz amplifier. In its manufacture, a layer of a semiconductor material, gallium-indium arsenide, with a thickness of only 83 atoms, and a layer of a piezoelectric material comparable in thickness, lithium niobate, was used. As a result, the entire structure of the amplifier fits into an area of 0.5 square millimeters, it operates at a voltage of 36 volts and consumes only 20 mW of energy. At the same time, the new amplifier provides 100 times higher radio signal gain than similar devices of previous generations.
A similar amplifier operating in the 2 GHz band, which is currently used in cellular communications, will have an even smaller size, it will be able to fit in an area of 0.02 square millimeters, which is about 10 times smaller than existing modern solutions.
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