Acoustic switch. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Clocks, timers, relays, load switches
Comments on the article
The figure shows a diagram of an acoustic switch in which an integrated microcircuit is used. Thanks to it, the switch can be made very compact.
The device works as follows. The microphone converts the audio signal into an electrical one, and the cascade on transistor V1 amplifies it to the required level. Next, the signal is fed to a single vibrator assembled on the element D1.1. In the initial state, the inverse output of the one-shot D1.1 is logical "1", and the direct output of the trigger D1.2 is 0. Therefore, the transistor V2 is closed and the actuator is turned off by the relay contacts K1 (not shown in the figure). If you clap your hands or say something loudly in front of the microphone, the one-shot produces a short pulse, which is fed to the input of the trigger D 1.2.
The latter goes into another stable state: now its output will be a logical "1". At the same time, the transistor V2 will open and the relay K1 will work, connecting the actuator with its contacts.
The inverted trigger output D1.2 is connected to input D, so the logic level at this input will always be opposite to the direct output. Therefore, the next pulse generated by the single vibrator D1.1 will again switch the trigger D1.2. its output will now be a logical "0" and the transistor V2 will close.
The acoustic switch can be used in various automation systems and electronic toys.
Note. Instead of transistors V1, V2, you can use any low-power transistors of the appropriate structure, diode V3 - any low-power rectifier. Microphone B1 must be carbon.
Literature
- "Radio, television, electronics" (NRB), 1978, N 2
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 Printer for printing LEDs and photocells
23.11.2013
Printer for large LED displays, according to German scientists, will soon become a reality. According to Dr. Armin Wedel (Armin Wedel) from the Fraunhofer Institute for Applied Polymer Research in Potsdam (Germany), revolutionary screens are waiting for consumers soon. The first curved screen was shown to the mass audience this year at the electronics exhibition in Berlin. What is the essence of technology? LEDs: flexible, organic light emitting diodes. However, the scientist noted, the technology used in such displays goes far beyond the production of screens. He believes OLEDs are also ideal for all types of lighting and digital signage systems - electronic posters, billboards, road signs and traffic management systems.
The scientists worked in collaboration with engineering company MBRAUN to create a manufacturing facility that could produce LEDs as well as organic solar panels on an industrial scale. The innovation is that LEDs and solar cells can now be printed from solutions containing luminescent organic molecules and absorbent molecules, making printing on carrier film very easy.
Previously, such a process involved the evaporation of small molecules in a high vacuum, and this greatly increased the cost of the process. Therefore, scientists could only use printing technologies to develop components on a laboratory scale. But now it has become possible to produce large series of such elements. Scientists note that they are already able to produce organic components almost on an industrial scale and new scientific developments can finally be translated into commercial use.
At the heart of the pilot plant is a robot that controls various printers that act as an inkjet printing system. The LEDs are attached to the same substrate layer at the same time using different starting materials. This allows you to form a uniform surface that creates a perfect luminous layer.
Industry experts believe that printed LEDs promise to be a billion-dollar market. The production capacity will help to provide competitive advantages in this market segment.
|
Other interesting news:
▪ Xigmatek Xi-3 HDT Thermal Grease
▪ Router Netgear R6250, 802.11ac (5G Wi-Fi)
▪ DDR4 chip based on third-generation 10nm class technology
▪ Electric liner for short flights
▪ Lynx in the water
News feed of science and technology, new electronics
Interesting materials of the Free Technical Library:
▪ site section Infrared technology. Article selection
▪ article Lenz Emily. Biography of a scientist
▪ article Whose notes can be read both from top to bottom and from bottom to top, forming a duet of two violins? Detailed answer
▪ article Potentilla erect. Legends, cultivation, methods of application
▪ article Sweep frequency generator. Encyclopedia of radio electronics and electrical engineering
▪ article Radio control for 15 commands, 433.92 MHz. 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