Remote object control device. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Security devices and object signaling
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.
Publication: N. Bolshakov, rf.atnn.ru
See other articles Section Security devices and object signaling.
Read and write useful comments on this article.
<< Back
Latest news of science and technology, new electronics:
Artificial leather for touch emulation
15.04.2024
In a modern technology world where distance is becoming increasingly commonplace, maintaining connection and a sense of closeness is important. Recent developments in artificial skin by German scientists from Saarland University represent a new era in virtual interactions. German researchers from Saarland University have developed ultra-thin films that can transmit the sensation of touch over a distance. This cutting-edge technology provides new opportunities for virtual communication, especially for those who find themselves far from their loved ones. The ultra-thin films developed by the researchers, just 50 micrometers thick, can be integrated into textiles and worn like a second skin. These films act as sensors that recognize tactile signals from mom or dad, and as actuators that transmit these movements to the baby. Parents' touch to the fabric activates sensors that react to pressure and deform the ultra-thin film. This ... >>
Petgugu Global cat litter
15.04.2024
Taking care of pets can often be a challenge, especially when it comes to keeping your home clean. A new interesting solution from the Petgugu Global startup has been presented, which will make life easier for cat owners and help them keep their home perfectly clean and tidy. Startup Petgugu Global has unveiled a unique cat toilet that can automatically flush feces, keeping your home clean and fresh. This innovative device is equipped with various smart sensors that monitor your pet's toilet activity and activate to automatically clean after use. The device connects to the sewer system and ensures efficient waste removal without the need for intervention from the owner. Additionally, the toilet has a large flushable storage capacity, making it ideal for multi-cat households. The Petgugu cat litter bowl is designed for use with water-soluble litters and offers a range of additional ... >>
The attractiveness of caring men
14.04.2024
The stereotype that women prefer "bad boys" has long been widespread. However, recent research conducted by British scientists from Monash University offers a new perspective on this issue. They looked at how women responded to men's emotional responsibility and willingness to help others. The study's findings could change our understanding of what makes men attractive to women. A study conducted by scientists from Monash University leads to new findings about men's attractiveness to women. In the experiment, women were shown photographs of men with brief stories about their behavior in various situations, including their reaction to an encounter with a homeless person. Some of the men ignored the homeless man, while others helped him, such as buying him food. A study found that men who showed empathy and kindness were more attractive to women compared to men who showed empathy and kindness. ... >>
| Random news from the Archive Invisible solar cell suitable for window glass
23.07.2022
A team of scientists from Tohoka University (Japan) has created an almost invisible solar cell using indium tin oxide (ITO) as a transparent electrode and tungsten disulfide (WS2) as a photoactive layer. They published the results of the study in the scientific journal nature.
It is noteworthy that the transparency of the solar battery reaches 79%. This will allow in the future to use these devices to equip "smart" homes, inserting them into windows instead of glass, to cover the screens of various gadgets like a smartphone and a fitness bracelet. The transparent solar panel will power wearable and mobile devices, saving people from having to carry a charger with them and depend on an outlet.
WS2 (tungsten disulfide) is a thin monolayer semiconductor composed of a transition metal and a chalcogen. According to scientists, this material is ideal for creating almost "invisible" solar panels. Bonding of indium tin oxide and tungsten disulfide (ITO-WS2) is achieved by sputtering ITO onto a quartz substrate and growing a WS2 monolayer using chemical vapor deposition. The contact barrier between WS2 and ITO was controlled by depositing thin metal layers on top of ITO (Mx/ITO) and a thin layer of WO3 between Mx/ITO and the WS2 monolayer.
As a result, the height of the Schottky barrier increased sharply (up to 220 meV), which increased the efficiency of charge carrier separation in this solar battery. The Schottky barrier is a barrier that appears in the contact layer of a semiconductor adjacent to a metal, equal to the difference in the work functions of the metal and the semiconductor.
As a result, the researchers found that the energy conversion efficiency of the electrode-optimized (WO3/Mx/ITO) solar cell was more than 1000 times higher than that of a device using a conventional ITO electrode.
The researchers calculated that a 1cm solar cell with a very high average visible light transmittance (79%) could increase its total output to 420pW. This became clear in the course of experiments that scientists conducted several times in a row.
Only in the USA the area of glass surfaces is from 5 to 7 billion square meters. m - from phone screens to skyscrapers. "Imagine the huge amount of electricity that could be produced if we could glaze these areas with such solar panels."
|
Other interesting news:
▪ Micron 9300 Solid State Drives
▪ Photonic crystal invisibility cloak
▪ Fabric with built-in heating
▪ Fresh water from the seabed
▪ Maya Pepper Cocoa
News feed of science and technology, new electronics
Interesting materials of the Free Technical Library:
▪ section of the site Grounding and grounding. Selection of articles
▪ article The soul must work. Popular expression
▪ article What is the Rh factor? Detailed answer
▪ article Fire alarm systems
▪ article Soldering iron-economy. Encyclopedia of radio electronics and electrical engineering
▪ article Bouquet from a tube. 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