Device for testing capacitors. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
Comments on the article
In the process of long-term operation, failures in the operation of electronic equipment are often associated with a loss of capacitance of oxide capacitors. As any practitioner knows, the procedure for dismantling capacitors is very laborious. Moreover, during dismantling, there is often a risk of overheating and peeling of the printed circuit board foil.
A simple version of the device is offered to the attention of radio amateurs, which allows you to check capacitors without soldering them from the circuit board. It is easy to manufacture, requires a minimum number of non-deficient parts and does not need to be adjusted.
The diagram of the device is shown in the figure.
On the inverters of the DD1 chip, a wide-range generator of rectangular pulses is assembled, the frequency of which is determined by the capacitance of the tested capacitor. Its essential feature is that even when shunting the tested capacitors in circuit boards with resistances of 100 ohms or more, the stability of the generator operation is not disturbed, and a small value of the alternating voltage at the control points does not open the p-n junctions of semiconductor devices. Capacitor C1 increases the stability of the generator.
A frequency divider is assembled on the DD2 counter, to the separate outputs of which LEDs are connected. The performance of the tested capacitor and approximately its capacitance are determined by the blinking frequency of the corresponding LED. So, at a blinking frequency of 1 Hz of the HL1 LED, the measured capacitor has a capacitance of about 100 μF, a similar blinking frequency of the second LED (HL2) corresponds to a capacitor capacitance of about 10 μF, the same frequency for the third is about 1 μF.
With a different blinking frequency of the LEDs, a proportional increase (decrease) in frequency can approximately determine the value of the measured capacitance.
If desired, the range of measured capacitances can be expanded by connecting another frequency divider in series with the first one with the corresponding taps to the LED indicators.
Author: V.Kotlyarov, Tver
See other articles Section Measuring technology.
Read and write useful comments on this article.
<< Back
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.
... >>
Advanced Infrared Microscope
02.05.2024
Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>
Air trap for insects
01.05.2024
Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>
| Random news from the Archive Smart speaker Huawei Sound SE
03.10.2021
Huawei introduced the Huawei Sound SE smart speaker.
Huawei Sound SE speakers are available in two color options: black and white with gold accents. The device received as many as six speakers: three full-range speakers, one woofer and two passive radiators. Huawei Sound SE received Devialet Push-Push acoustic architecture, Devialet SAM technology and Devialet joint tuning algorithm.
In terms of connectivity, the Huawei Sound SE smart speaker supports Bluetooth 4.2 and Wi-Fi. There's also a 3,5mm audio input and support for DLNA/QPlay playback. The device runs the HarmonyOS 2.0 operating system and supports features such as touch input and voice control through several different voice assistants available on the market.
Huawei Sound SE also supports quick connection to other smart devices, including smart screens, tablets, and more. When the speaker is near other devices, it automatically detects them and opens a connection popup without the need to install any app on the device.
The price of new items is $124.
|
Other interesting news:
▪ Reproduction in space possible
▪ Nvidia AI systems for construction sites
▪ Stem cells in the shell
▪ Sony FDR-X3000R compact camcorder
▪ Video club for Japanese pensioners
News feed of science and technology, new electronics
Interesting materials of the Free Technical Library:
▪ section of the site Home workshop. Article selection
▪ article Foreign literature of the XX century in brief. Part 1. Cheat sheet
▪ article Who Built St. Peter's Cathedral in London? Detailed answer
▪ article A running simple knot. Travel Tips
▪ article Pearl and mother-of-pearl masses. Simple recipes and tips
▪ article Classic grip of the ball with the palm of your hand. Focus Secret
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