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Universal power supply, 2-12 volts 1 amp



Section Power supplies. The use of the KR142EN12A (B) microcircuit and the TPP255-220-50 unified transformer makes it possible to manufacture a simple and reliable power source for various household devices. The output voltage of the source can be smoothly adjusted from 2 to 12 V. The maximum load current is 1 A, while the amplitude of the output voltage ripple does not exceed 2 mV ... >>

A simple pulse metal detector on microcircuits



Section Metal detectors. Recently, pulsed metal detectors of the PI (Pulse Induction) type have become relatively widespread, in which, to assess the presence of metal objects in the search zone, the phenomenon of the occurrence of eddy surface currents in a metal object under the influence of an external electromagnetic field is used. In metal detectors of the PI type, a pulse signal is applied to a transmitting coil, in which an alternating electromagnetic field is initiated. When a metal object appears in the zone of action of this field, eddy currents periodically arise on its surface under the influence of a pulsed signal. These currents are the source of the secondary signal, which is received by the receiving coil. Due to the phenomenon of self-induction, the shape of the secondary signal will differ from the shape of the pulse emitted by the transmitting coil ... >>

Mains voltage stabilizer with microcontroller control



Section Voltage stabilizers. A long-term deviation of the mains voltage by more than 10% from the nominal value of 220 V in many regions of our country, unfortunately, has become a common occurrence. With an increased (up to 240 ... 250 V) voltage in the network, the service life of lighting devices is significantly reduced, the heating of transformer power supplies and motors in refrigerator compressors increases. Reducing the mains voltage below 160 ... 170 V causes a significant increase in the load on key transistors in switching power supplies (this can lead to their overheating and subsequent thermal breakdown), as well as jamming of motors in refrigerator compressors, which also leads to their overheating and output out of service. Even greater voltage fluctuations for single-phase consumers powered by a three-phase network occur in the event of a break in the neutral wire in the area from the point of connection of the consumer to the four-wire network to the transformer substation. In this case, due to phase imbalance, the voltage in the outlet can vary from several tens of volts up to linear 380 V, which will inevitably lead to damage to almost all complex household appliances connected to the outlet. The proposed stabilizer will help to avoid the troubles associated with extreme voltage fluctuations in the network. ... >>

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Articles on electric motors

Articles on electric motors; electric motor schemes; descriptions of electric motors: 149 articles

 


 

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Regulatory documentation for an electrician

 


 

Latest news of science and technology, new electronics:

Sound-absorbing silk 17.05.2024

In a world where noise is becoming increasingly intrusive, the emergence of innovative materials that can reduce its impact is of great interest. MIT researchers have unveiled a new sound-absorbing silk fabric that promises to revolutionize quiet spaces. The Massachusetts Institute of Technology (MIT) has made significant breakthroughs in the field of sound absorption. Researchers have developed a special silk fabric that can effectively absorb sound and create cozy, quiet environments. The fabric, thinner than a human hair, contains a unique vibrating fiber that is activated when voltage is applied to it. This feature allows the fabric to be used to suppress sound waves in two different ways. The first method uses fabric vibrations to generate sound waves that cover and cancel out unwanted noise, similar to noise-canceling headphones. This p ... >>

High Energy Density Capacitor 17.05.2024

Energy plays a key role in many aspects of modern life, and the ever-increasing demand for efficient and fast-charging power sources is driving innovation. Researchers at the McKelvey School of Engineering at Washington University in St. Louis have taken a significant step forward with a high-energy-density capacitor that promises to revolutionize the world of energy. A team of scientists from the McKelvey School of Engineering at Washington University in St. Louis presented the results of their latest research on heterogeneous thin-film structures for capacitors. Researchers, working with ferroelectrics, inadvertently created a capacitor with an amazing energy density that is 19 times higher than that of conventional elements. This breakthrough opens up new prospects for the development of fast-charging batteries, which are so necessary in the modern world. Capacitors play a key role in various devices, providing stable ... >>

Causes of conflicts between brothers and sisters 16.05.2024

Family relationships are often complex and multi-layered, and conflicts between siblings are no exception. Research in this area can help us understand what factors underlie these conflicts and why they occur so frequently. Let's look at some of the findings from psychologists at Arizona State University. American psychologists from Arizona State University conducted a study aimed at identifying the causes of conflicts between brothers and sisters. They found that different forms of violence, whether physical or verbal, did not depend on the gender of the siblings. This means that both girls and boys can exhibit aggressive behavior towards their loved ones. Other studies have shown that conflict between siblings often persists into adulthood, even as contact decreases. This indicates that people often follow established patterns of behavior formed in childhood. It was also found that, despite ... >>

Random news from the Archive

Smartphone for women Nokia Nokia 08.03.2024

Nokia has unveiled a special pink smartphone model released in honor of International Women's Day. Despite the affordable price, the device has impressive characteristics.

The new Nokia G42 smartphone offers a good combination of affordable price and quality features, making it an attractive choice for modern women who want to keep up with the latest technology trends.

The smartphone is equipped with a Snapdragon 480+ processor and a 6,56-inch IPS screen with a refresh rate of 90 Hz and a brightness of up to 450 nits. The screen is protected by tempered Gorilla Glass. Its photo module features a 50-megapixel main camera and two additional 2-megapixel sensors, as well as an 8-megapixel front camera.

The device runs on the Android 13 operating system and supports WiFi 6, Bluetooth 5.1. It also has a USB Type-C port, a MicroSD card slot, a side-mounted fingerprint scanner and a 3,5mm audio jack. The battery capacity is 5000 mAh.

Nokia G42 price in India starts from 10 thousand rupees ($120) for the version with 4 GB of RAM and 12,5 thousand rupees ($151) for the 6 GB model. The device comes with a 20-watt charger and a transparent protective case.

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