Thyristor thermostat. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power regulators, thermometers, heat stabilizers
Comments on the article
The thermostat is designed to maintain a constant air temperature in a small room, water temperature in an aquarium, etc.
Heater power up to 500 W. The thermostat consists of a threshold device (T1, T2), an electronic relay (T3, D10) and a power supply. The temperature sensor is the thermistor R5.
At a given temperature, transistor T1 is closed and T2 is open. Transistor T3 and thyristor D10 are closed, and no voltage is supplied to the heater. With a decrease in temperature, the resistance of the thermistor increases, the bias voltage at the base of transistor T1 increases. As soon as it reaches the threshold, transistor T1 opens and T2 closes. This leads to the opening of the transistor T3 and thyristor D11. The mains voltage through this thyristor and diodes D6-D9 will go to the heater.
When the set temperature is reached, it switches to standby mode. Resistor R11 sets the temperature control limits. The TP1 transformer is assembled on a W12 x 25 core, winding I has 8000 turns of wire: PEV-1 with a diameter of 0.t mm, and winding II has 70 turns of PEV-1 wire with a diameter of 0.4 mm. Resistor R5-type MMT-4.
See other articles Section Power regulators, thermometers, heat stabilizers.
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 Earwig robot
11.11.2007
Professor Peter Brett from Aston University (Great Britain) has created a surgical robotic microdrill for penetrating into the inner ear when implanting an implant - a highly advanced internal hearing aid.
In severe cases of deafness, electrodes from the 58 amplifier are brought to the cochlea of the inner ear to send signals directly to the auditory nerve. A computer-controlled drill makes a channel thinner than a millimeter in the right place and stops above the cochlear membrane without piercing it. The surgeon only needs to insert the electrodes.
|
Other interesting news:
▪ Seagate Mobile Barracuda and Firecuda Mobile Hard Drives
▪ Large memory audio player
▪ Dogs look like their owners
▪ Smartphone flat camera technology
▪ Battery scooter
News feed of science and technology, new electronics
Interesting materials of the Free Technical Library:
▪ section of the site Tips for radio amateurs. Selection of articles
▪ article by Herschel Wilhelm. Biography of a scientist
▪ article What is the pleasure center and where is it located in the body? Detailed answer
▪ article Oakmoss. Legends, cultivation, methods of application
▪ article Power amplifier with balanced differential input stage. Encyclopedia of radio electronics and electrical engineering
▪ article Radio transmitter with a fixed frequency master oscillator. 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