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Mobile connection. Schemes, articles, descriptions

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A simple thyristor voltage regulator for 127 and 220 volts

Section Power supplies. The device, the circuit of which is shown in the figure, can be used to regulate the voltage on the load of an active and inductive nature, powered by an alternating current network with a voltage of 127 and 220 V. The voltage on the load can be changed from zero to the rated voltage of the network ... >>

Universal device on a microcontroller: clock, thermometer, thermostat, alarm clock, remote control system

Section Microcontrollers. The Universal device contains the functions of several devices that make life easier for people by automating the living space. Since the device is rapidly improving, it has its own USB bootloader, so to update the firmware, simply connect the Universal device to the computer, turn on the self-programming mode and run the firmware update program on the PC. At the same time, there is no danger of blocking the device forever, as is sometimes the case when updating the firmware of mobile phones ... >>

Connection of 2 computers on laser pointers

Section Electronics and computer. The device is powered by a COM port. Phototransistor - any of the domestic ones, for example, type FT-2, resistor R1 - within 5-10 kOhm. Diodes - D522. Capacitor 10uF x 10V. In a good way, it would be necessary to implement a normal limiting circuit for a laser diode. Since the circuit does not convert RS232 to SIR, the range is about a hundred meters (well, or a little more) ... >>

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Articles on mobile communications

Articles on mobile communications; schemes for mobile communications; descriptions of mobile communication devices: 114 articles



Cell phones. Expert Reviews

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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

About the benefits of walking 06.04.2000

Steve Bird and his colleagues from the Department of Physical Therapy at the Medical College in Kent (UK) proved that walking affects the composition of the blood. They selected 56 sedentary volunteers and divided them into four groups.

One group had to take a walk lasting 20-40 minutes daily, the second - two walks of 10-15 minutes, the third - three of 5-10 minutes. The fourth group sat at home in front of the TV. Before the start of the experiment, the blood levels of lipoproteins were measured in all of them - compounds of proteins with fat that contribute to the development of atherosclerosis.

This continued for 18 weeks, after which the analysis of blood fats was repeated. For those who walked for a relatively long time, the content of the most harmful lipoprotein fell by 50 milligrams, for the "intermediate" this drop was twice as modest, and for those who walked three times, but little by little, the content of the dangerous substance was reduced by only 10 milligrams. So long walks are most effective. In "sedentary" lipoprotein content remained the same.

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