Combined HPF filter. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Tone, volume controls
Comments on the article
If desired, the cutoff frequency, order and type of filters can be changed. The formulas required for the calculation are in Directory. By the way, the transfer coefficient of the source follower (0,7 ... 0,85) depends on the steepness of the transistor characteristic. Therefore, the calculated values of the frequency-setting elements must be corrected or formulas should be used that take into account the transmission coefficient. They are, for example, in the two volumes of Horowitz and Hill. Let this be "homework".
In addition, simple filters on source followers have other disadvantages. The main one is a low transmission coefficient. When using common low-power field-effect transistors with a slope of 3-7 mA/V, the signal at the output of the main channels will be attenuated by 2...3 dB. In combination with a low output overload capacity, only one thing follows from this - the sensitivity of the amplifier should be on the order of 300 ... 500 mV.
To overcome this disadvantage, you can use the combined stages of the structure "Common source - common collector" with a gain of 2-3 dB. Note that the output signal is inverted.
Author: A. Shikhatov; Publication: bluesmobile.com/shikhman
See other articles Section Tone, volume controls.
Read and write useful comments on this article.
<< Back
Latest news of science and technology, new electronics:
Alcohol content of warm beer
07.05.2024
Beer, as one of the most common alcoholic drinks, has its own unique taste, which can change depending on the temperature of consumption. A new study by an international team of scientists has found that beer temperature has a significant impact on the perception of alcoholic taste. The study, led by materials scientist Lei Jiang, found that at different temperatures, ethanol and water molecules form different types of clusters, which affects the perception of alcoholic taste. At low temperatures, more pyramid-like clusters form, which reduces the pungency of the "ethanol" taste and makes the drink taste less alcoholic. On the contrary, as the temperature increases, the clusters become more chain-like, resulting in a more pronounced alcoholic taste. This explains why the taste of some alcoholic drinks, such as baijiu, can change depending on temperature. The data obtained opens up new prospects for beverage manufacturers, ... >>
Major risk factor for gambling addiction
07.05.2024
Computer games are becoming an increasingly popular form of entertainment among teenagers, but the associated risk of gaming addiction remains a significant problem. American scientists conducted a study to determine the main factors contributing to this addiction and offer recommendations for its prevention. Over the course of six years, 385 teenagers were followed to find out what factors may predispose them to gambling addiction. The results showed that 90% of study participants were not at risk of addiction, while 10% became gambling addicts. It turned out that the key factor in the onset of gambling addiction is a low level of prosocial behavior. Teenagers with a low level of prosocial behavior do not show interest in the help and support of others, which can lead to a loss of contact with the real world and a deepening dependence on virtual reality offered by computer games. Based on these results, scientists ... >>
Traffic noise delays the growth of chicks
06.05.2024
The sounds that surround us in modern cities are becoming increasingly piercing. However, few people think about how this noise affects the animal world, especially such delicate creatures as chicks that have not yet hatched from their eggs. Recent research is shedding light on this issue, indicating serious consequences for their development and survival. Scientists have found that exposure of zebra diamondback chicks to traffic noise can cause serious disruption to their development. Experiments have shown that noise pollution can significantly delay their hatching, and those chicks that do emerge face a number of health-promoting problems. The researchers also found that the negative effects of noise pollution extend into the adult birds. Reduced chances of reproduction and decreased fertility indicate the long-term effects that traffic noise has on wildlife. The study results highlight the need ... >>
| Random news from the Archive Winter is the season of volcanoes
12.10.2004
Geophysicists at the University of Cambridge (England) analyzed data on the start time of 3200 volcanic eruptions that occurred from 1700 to 1999.
It turned out that during this long period in the Northern Hemisphere in winter (November - March), eruptions occurred 18 percent more often than in summer. This effect is especially pronounced along the margins of the Pacific Ocean - in the Andes, Central America and Kamchatka. It is also observed on individual volcanoes. For example, the Japanese volcano Sakurajima most often wakes up in November.
Scientists believe that the matter is in the water cycle. In winter, the earth's crust in the Northern Hemisphere sags slightly under the weight of ice, snow, and rainwater, making volcanic activity more likely. So, the Japanese islands in winter sink deeper into the ocean by 2-3 centimeters.
|
Other interesting news:
▪ High-entropy alloys for new superconductors
▪ Could there be dark matter at the center of the sun?
▪ Clothes with memory will adapt to the owner
▪ Household gas outlet
▪ The Digital Key standard will turn your smartphone into a car key
News feed of science and technology, new electronics
Interesting materials of the Free Technical Library:
▪ section of the site Audio and video surveillance. Selection of articles
▪ article Don't wake a sleeping dog. Popular expression
▪ article How pigeons help doctors and drug dealers? Detailed answer
▪ article Hang glider Vympel-9. Personal transport
▪ article Installation of solar hot water supply. Encyclopedia of radio electronics and electrical engineering
▪ article Lithuanian proverbs and sayings. Large selection
Leave your comment on this article:
All languages of this page
Home page | Library | Articles | Website map | Site Reviews
www.diagram.com.ua
2000-2024
Arabic
Bengali
Chinese
English
French
German
Hebrew
Hindi
Italian
Japanese
Korean
Malay
Polish
Portuguese
Spanish
Turkish
Ukrainian
Vietnamese