Remote object control device. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Safety and security
Comments on the article
A relatively simple electronic device allows you to monitor the status of objects remote from home, such as a utility shed in a garden plot.
The diagram of the device is shown in the figure. Contacts SF1 are installed on the door of the protected object, the resistor R1 is also located there. The dashed lines show the plume from the object to the house.
In standby mode, half of the supply voltage from the R1R2 divider is supplied to the bases of transistors VT2 and VT1, transistors VT1 and VT2 are almost closed and the current consumed by the device from the power source does not exceed 110 μA.
When the door of the protected object is opened and the SF1 contacts are closed, the transistor VT2 immediately opens, which, in turn, opens the transistors VT4 and VT3, which form an electronic controlled switch. In this case, the electromagnetic relay K1 is activated and the contacts K1.1 turn on the HA1 bell (or other signaling device) and the HL1 LED.
In the event of a loop break, transistor VT1 opens (through resistors R2, R3), followed by transistor VT3 (through resistor R5 and diode VD1) and transistor VT4. Relay K1 is activated and contacts K1.1 turn on the alarm.
The static current transfer coefficient of the base of all transistors is at least 100. Relay K1 for an operating current not exceeding the collector current of transistors VT3 and VT4.
Author: A. Muraviev
See other articles Section Safety and security.
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 Pheromones against crop pests
11.12.2022
The main harm to agriculture is caused by a butterfly called cotton scoop. It devours about 1/5 of all crops grown, but scientists from Lund University have figured out how to deal with it.
Female insects can attract mates in complete darkness without any sound signal and at a distance of hundreds of meters using sex pheromones.
Males track the smell of these chemical signals and mate with females, who then lay eggs. After that, hungry larvae hatch, destroying crops.
"We can use artificial pheromone compounds in the field that will spread all over the air and override the original signal from a real female," explained Hong-Lei Wang, a researcher on the pheromone group at Lund University in Sweden.
This sheer sheath of sexual odor makes it harder for males to find females and mate, and so the insect population is declining, meaning there are fewer pests in the area that can damage crops.
Experts have already isolated the necessary chemical elements from oilseeds and tested their development, comparing its effectiveness with synthetic pheromones that are used in agriculture.
Until now, the costs of these substances have limited their widespread use. The creation of artificial pheromones was quite expensive, so they were used only when it was cost-effective - for example, to protect fruits.
But now Wang and his colleagues have discovered a way to produce pheromones in an affordable and sustainable way. They also tested their development in the fields. Over time, the number of male cutworms in the territories treated with pheromones has significantly decreased. This indicates the high efficiency of the new method.
|
Other interesting news:
▪ Eternal taste of chewing gum
▪ Fujitsu Eternus LT tape storage systems
▪ About the benefits of walking
▪ Salo from a test tube
▪ Interesting life improves immunity
News feed of science and technology, new electronics
Interesting materials of the Free Technical Library:
▪ section of the site Life of remarkable physicists. Article selection
▪ article You, the current ones, come on! Popular expression
▪ article What type of communication do adult cats use only to attract a person? Detailed answer
▪ Lungwort's article is obscure. Legends, cultivation, methods of application
▪ article Security device based on simulator. Encyclopedia of radio electronics and electrical engineering
▪ article Electroplating. Chemical Experience
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