Remote illuminator status indicator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Lighting
Comments on the article
At one time, I was faced with the need to control the burning and integrity of the light bulb when the switch is located in another room (for example, a basement, cellar or chicken coop). It happened more than once, the switch is on, but the light is off: either it burned out, or the contact in the cartridge or switch disappeared. At the same time, the switch is located in the corridor, and to the basement where the chickens live, you need to go around the house. It is especially bad when, because of this, the bird does not enter the basement in the evening, and then it has to be brought in manually.
The problem was solved by installing a simple and trouble-free device that indicates the flow of current in the lighting lamp circuit and is located near the switch.
The indicator circuit is shown in the figure, where S is the light switch; HL - lighting lamp with a power of 60-100 W; VD1...VD6 - ballast diodes; VD7 - LED indicator. When current flows through the ballast diodes, a voltage drops across them, sufficient to light the LED. You can connect the device at any convenient point in the electrical circuit (before or after the switch) or into the break of the second wire going to the lamp.
The indicator is not critical to details. As ballast diodes, you can use any small-sized diodes with a permissible forward current not lower than the consumed current of the illuminator and any operating voltage (for lamps with a power of 60-150 W, you can use KD208, KD209, KD212, KD215, KD217, etc. up to 60 W - KD105, KD106, D226, D237, etc.). A more powerful load will require more powerful diodes, while two diodes must be installed in each branch. The LED must have a constant forward voltage of 1,7 ... 2,2 V at a current of at least 10 mA. Of the domestic LEDs, these requirements are met by AL307A, B, of the imported ones, almost any with a red, orange or yellow glow color.
The design of the indicator leaves room for creativity. With great desire and some sophistication, it can even be placed in the body of the switch itself. The author has the device installed separately from the switch (but next to it), so that it can be seen from afar. The board with clamps for connecting wires is mounted in a plastic case (children's cube), the LED lens is brought out through a hole in the wall.
The indicator has been working flawlessly for six months.
Author: O.N. Koval
See other articles Section Lighting.
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 Cooling material based on camel fur
15.11.2020
The researchers took inspiration from camel fur and developed a material that can lower its temperature without consuming electricity.
Materials cool when water evaporates from their surface. But as soon as all the water evaporates, the cooling effect disappears. Camels, like no other, are adapted to life in the desert. Although at first glance it seems that a "bald" camel will cool more efficiently than a fur-covered one, in fact this is not the case. Fur protects the animal's skin from heat and at the same time allows sweat to evaporate more slowly. As a result, cooling lasts longer, which allows the camel to save water by cooling the skin.
A new material created by researchers at MIT works in a similar way. It consists of two layers: a hydrogel is located on the bottom, and a porous silica-based airgel is located on top. The hydrogel is 97% water, which evaporates when heated. Due to this, the temperature of the material decreases when heat is applied. Airgel has very low thermal conductivity and absorbs very little heat from the environment. This allows you to keep the bottom layer of the hydrogel cold.
During the experiments, a "naked" hydrogel layer 5 millimeters thick lost all its water within 40 hours at an ambient temperature of 30 °C. However, after coating the hydrogel with a 5 mm layer of airgel, the drying time of the material at the same temperature increased to 200 hours. During cooling, the temperature of the material dropped by 7 °C. The cooling effect is "renewable": after the material has completely dried, it is enough to add water to it, and it will again cool the external environment.
Creating an airgel is still a rather difficult and expensive task, so researchers are looking for new materials that could replace it. Scientists hope that their technology will help people in hot regions. It can reduce the cost of shipping and storing food and medicine.
|
Other interesting news:
▪ New 14A voltage conversion modules in EXCALIBUR package
▪ The roof of the world starts to leak
▪ Moisture-resistant and dustproof reader PocketBook 640
▪ Lithium-sulfur batteries for electric vehicles
▪ SOI process technology for RF chips for mass applications
News feed of science and technology, new electronics
Interesting materials of the Free Technical Library:
▪ site section Color and music installations. Selection of articles
▪ article Instruction on labor protection for electric welders of manual welding
▪ article Which country produces the most movies? Detailed answer
▪ Seiba's article. Legends, cultivation, methods of application
▪ article Antenna angle indicators. Encyclopedia of radio electronics and electrical engineering
▪ article The spectator holds some cards, but they become different. 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