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Automobile. Ignition. Schemes, articles, descriptions

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Automobile. Ignition

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Calculation of the J-shaped antenna



HF Antenna Section. A particularly simple way to power a half-wave vertical antenna is to connect a closed quarter-wave line B to the high-resistance lower end of the emitter and search along its length for a resistance corresponding to the characteristic impedance of the power cable. Since along the length of the L/4 line the resistance varies from tens of thousands of Ohms at the point of the lower end of the emitter (maximum voltage) to zero at the point of closure of the matching line (minimum voltage), it is thus possible to match a coaxial cable and a VHF ribbon cable with the antenna with any characteristic impedance, as well as a two-wire power line with air insulation and a characteristic impedance of 600 Ohms ... >>

An interesting circuit electronic ballast on discrete elements for compact fluorescent lamps



Section Ballasts for fluorescent lamps. An interesting circuit solution for an electronic ballast can be found in the CFL of the Vinnitsa plant. The appearance of the Vinnitsa ballast is shown in fig. 3.47. The schematic diagram is shown in fig. 3.48. Of the features of circuitry, it should be noted the chain of preheating of the cathodes, implemented on the elements RK, VD8-VD11. This ballast is assembled on high-quality imported elements, with the exception of the resistor R1. Since the ballast is the brainchild of the German-Ukrainian cooperation, we decided to use the MLT-1 resistor ... >>

Answers to questions about MMDS converter designs



Section Television. I start setting up with UHF UHF (VT5, VT6). With the help of a frequency response meter, I select the position of the tap of the output coil of the IF, achieving maximum and uniform gain in the range of 470-670 MHz. I send the signal to the input of the mixer VT4. Capacitor C16, together with its terminals, should resonate in the middle of this range. I connect the VT3 local oscillator and set its frequency to zero beats with a 2030 MHz generator. I connect UHF VT1, VT2 and finally set up the converter by applying a signal of 2500-2700 MHz to the input. UHF coupling capacitors with leads should resonate in the middle of this range. The resonance in the circuit is blurry, so I pre-adjust the length of their conclusions outside the circuit. I turn on the signal generator with modulation, which is visible on the TV as wide horizontal stripes. Gradually reducing the signal level, I adjust the circuit according to the maximum contrast of the bands. In the absence of devices, you can try to tune the IF for UHF television signals, and look for the local oscillator frequency before MMDS transmissions enter the UHF channels. Of course, this is possible only in the zone of reliable reception. ... >>

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Articles on automotive ignition units

Articles on automobile blocks of ignition; diagrams of automotive ignition units; descriptions of automotive ignition units: 50 articles

 


 

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Latest news of science and technology, new electronics:

Blinking of the magician and his audience 19.05.2024

Magic and illusions have always captured the attention of the public, but what happens behind the scenes of the magician and in the brains of his audience? Scientists from the UK decided to solve this mystery by conducting a new study involving ten illusionists of varying experience. Illusionists, some of whom had been practicing magic for more than half a century, others for only six months, were invited to demonstrate the same trick - the popular coin trick. Recordings of their performances during training and on stage showed that each of them began to blink significantly more often at the moment of performing the trick. The study's findings indicate that magicians' blink rate may be related to unconscious aspects of their performance. At the same time, as scientists have found, spectators also begin to blink more often, following the movements of the illusionist. This observation supports the idea that magicians may be catalysts for blinking in audiences. Additional research has shown that magicians blink more often during ... >>

Ultrasonic coffee machine 19.05.2024

Iced coffee has become an integral part of coffee culture in recent years. Therefore, engineers from the University of New South Wales decided to improve its preparation. They have developed an ultrasonic coffee machine that reduces the cold brew time for ground coffee beans from 12-24 hours to significantly less time. Iced coffee, or "Cold brew", is popular due to its smoothness, low acidity and low bitterness. It is prepared by steeping ground coffee in cold water for a long time. Unlike traditional hot brewing, which often imparts bitterness to coffee, cold brewing extracts more delicate and complex flavors from the coffee beans. The innovative system, presented by a team of engineers, introduces ultrasonic technology into the coffee preparation process. The system uses ultrasonic waves to speed up the process of extracting oils, flavor and aroma from ground coffee. This allows you to significantly reduce the time ... >>

The speech of sperm whales is similar to that of humans 18.05.2024

In the world of the ocean, where the mysterious and unknown coexists with the studied, sperm whales, with their huge brains, are of particular interest to science. Researchers, working with a huge array of audio recordings collected during the Dominica Sperm Whale Project (DSWP) - more than 8000 recordings, seek to unravel the secrets of their communication and understand the structure and complexity of the language of these mysterious creatures. By studying in detail the recordings of 60 sperm whales in the eastern Caribbean, scientists have revealed surprising features of their communication, revealing the complexity of their language. "Our observations indicate that these whales have a highly developed combinatorial communication system, including rubato and ornaments, which indicates their ability to quickly adapt and vary during communication. Despite significant differences in evolution, sperm whales have elements in their communication that are characteristic of human communication," says Shane Gero, a biologist at Carleton University and director of the CETI project. Issl ... >>

Random news from the Archive

MAX20343/MAX20344 converters 15.07.2021

Maxim Integrated has mastered the production of the new MAX20343/MAX20344 switching voltage regulators for use in compact, portable battery-powered devices. The MAX20343/MAX20344 is a fully integrated solution that combines a controller and power transistors in a single package that can drive loads up to 1A at 3,5V output.

The power section of the MAX20343/MAX20344 microcircuits is built on a non-inverting buck-boost circuit, which allows them to be used with primary energy sources, the voltage of which can be either higher or lower than the required output voltage. At the same time, special attention was paid to the functioning of the microcircuit in cases where the input voltage is approximately equal to the output: thanks to the unique transistor switching algorithm in these modes, it was possible to avoid sudden voltage fluctuations on the load and reduce the level of electromagnetic interference.

The key benefits of the MAX20343/MAX20344 are high efficiency (provided by flexible power section configuration and adaptive power switching algorithm), ultra-low internal current consumption, starting at 3,5 µA in operation and decreasing to 0,3 µA in standby mode, small levels of output voltage ripple and electromagnetic interference. The combination of these advantages makes the MAX20343/MAX20344 ideal for medical applications, such as portable photoplethysmographs, whose measurement accuracy is directly dependent on the levels of ripple and noise in the power supply circuits of the optical measurement system.

The high speed of response to transient processes, including sharp fluctuations in the input voltage, allows these microcircuits to be used to power devices with a sharply changing load, for example, wireless sensors of intelligent automated systems using LPWAN networks. In such applications, low power density primary power supplies are often used in conjunction with supercapacitors. In this case, the ability to work at an input voltage of 1,9 V allows you to maximize the installed power of the supercapacitor and increase the battery life.

Another area of ​​application for the MAX20343/MAX20344 chips are the Truly Wireless Stereo Bluetooth headphones. With a large voltage difference between the batteries of the case and the headphones, the latter, due to a decrease in the efficiency of the integrated chargers, begin to warm up, which can cause some discomfort when using them and leads to waste of a limited amount of battery power in the case. In this case, the use of MAX20343/MAX20344 chips will reduce the voltage supplied to the headphone chargers, which will lead to less heating of their cases and more rational use of the battery power of the case.

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