Sound relay. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Clocks, timers, relays, load switches
Comments on the article
On the pages of popular publications, descriptions of various options for acoustic switches have been repeatedly published.
I offer another scheme that I developed and manufactured more than nine years ago, and since then it has been working flawlessly in the corridor of my apartment. The circuit has a time relay. After a short beep, the light in the corridor turns on and stays on for about four minutes, then automatically goes out. The scheme itself is embedded in the wall, the walls are covered with wallpaper.
There are no switches in the corridor, the wallpaper is clean, which is rare when there is a switch and the children use it all the time.
(click to enlarge)
The scheme works as follows. The sound signal perceived by the BM1 electret microphone is fed to the DA1 microcircuit (microphone amplifier with a special frequency response) used in LEN radio stations. From the output of the microcircuit, the signal goes to the square-wave shaper, assembled on two inverters of the DD1 microcircuit, and then to the base of the transistor VT1, which, opening, discharges the timing capacitor (C3) of the Schmitt trigger. At the same time, a logical "1.4" appears on the output element of the trigger DD0, and the multivibrator made on the DD2 chip is turned on.
At the output of the multivibrator there is a pulse amplifier (VT2, VT3), from the output of which, through the separating capacitance C7, the signal is fed to the control electrode of the triac VS1. The triac opens and turns on the load. When the capacitor C3 is charged to the level of logical "1", the Schmitt trigger switches to another stable state, a logical "1.4" appears at the output of DD1, the multivibrator turns off, the triac closes, and the light bulb goes out. The exposure time is selected depending on the specific application of the circuit. With the capacitance rating C3 indicated in the diagram, the burning time of the electric lamp is 4 minutes. Any VD5 LED can be used.
Author: V. Lazovik, Makeevka; Publication: N. Bolshakov, rf.atnn.ru
See other articles Section Clocks, timers, relays, load switches.
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 Snow for Antarctica
29.07.2019
In an attempt to save the planet from global warming, scientists are developing ever more extreme strategies. Following Harvard scientists who proposed reducing the Earth's heating with sulfate aerosols, glaciologists at the University of Tasmania decided to save Antarctica's glaciers with 74 trillion tons of artificial snow.
Recent studies have shown that the warm waters of the ocean are washing away the coastal glaciers of West Antarctica, accelerating their destruction and sliding into the water. If all this ice collapses, the water level around the world will rise by about 3 meters - for coastal cities it will be a disaster.
To prevent this, scientists propose to strengthen the glaciers with artificial snow. Modeling results show that glacier destruction can be stopped by adding 10 meters of new ice every year for 10 years. To form this amount of ice in total, 74 trillion tons of artificial snow created from desalinated ocean water would be required.
True, it will not be easy to implement such a plan in practice. For comparison, the most high-performance artificial snow machines now make 20 tons of snow per minute. To produce 74 trillion, they would have to work for 700 years. Even if they manage to build new more powerful machines, they will need an enormous amount of energy, moreover, "green". Just to pump water out of the ocean, you need to build 000 wind turbines.
|
Other interesting news:
▪ The chicken's speech is deciphered
▪ New line of noise protection filters TDK-Lambda
▪ DVD-R high density disc
▪ Benefits of Anger
▪ Electric Bike
News feed of science and technology, new electronics
Interesting materials of the Free Technical Library:
▪ section of the site Electrical safety, fire safety. Article selection
▪ article Let's give the globe to children. Popular expression
▪ article Who is the palm thief? Detailed answer
▪ article Work on space-line typesetting machines (automatic machines). Standard instruction on labor protection
▪ article 432 MHz antenna with circular polarization. Encyclopedia of radio electronics and electrical engineering
▪ article Quality car sound system. Part 1. Encyclopedia of radio electronics and electrical engineering
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