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Electronics for home, gardening, hobby. Schemes, articles, descriptions

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Electronics for home, gardening, hobby

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Narrow-beam microphone



Section Audio. A narrow-beam microphone can be used to record and amplify speech in conditions of high noise, as well as to record sounds from distant sources, such as birdsong. The directivity of the microphone significantly increases the signal-to-noise ratio at the input of the bass amplifier. Schematically, the device of such a microphone is shown in Fig.1. Its main detail is an electromagnetic primer (3) placed in a cylindrical case (1). The capsule is filled with epoxy resin on both sides. The side of the capsule facing the open opening of the case has a small sensitive window that provides sound vibrations with access to the membrane. With the help of three stretch marks, the capsule is suspended on a wire ring (4), which is located in the back of the case. To reduce reflection from the walls, the inside of the case is covered with a layer of felt or felt (2) about 12 mm thick ... >>

Automatic charger



Section Chargers, batteries, galvanic cells. The device allows not only charging, but also restoring batteries with sulfated plates due to the use of asymmetric current when charging in the charge (5 A) - discharge (0,5 A) mode for the full period of the mains voltage. The device also provides the ability to speed up the charging process if necessary. This device has a number of features that contribute to the convenience of its use. ... >>

Sound amplifier for music lovers and audiophiles from Ulyanov



Section Transistor power amplifiers. Why am I working on transistors? There is a tube amplifier for Tango with Tamuras on the bottom shelf of the rack! That's the question. During my school years, at the dawn of my amateur radio, in the city in which I then lived, only lamps were available from radio components. Transistors were just beginning to come into amateur radio use as fashionable gadgets. Even Radio magazine in those days presented transistor electronics as something special. In the same way, I, assembling another tube structure from parts uprooted from old radios, dreamed of someday assembling a transistor amplifier with crazy power and reproducible frequency band for those times. And although an incalculable number of years have passed since then, and over these years I have assembled amplifiers with as much power as possible, apparently it was precisely this desire, then inherent, that still does not leave my amateur radio soul alone with such mesmerizingly glowing lamps. But enough nostalgia, let's move on to the essence of this story. ... >>

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Articles on electronics for the home, household plots, hobbies

Articles on devices for the home, household plots, hobbies; schemes of devices for the home, household plots, hobbies; descriptions of devices for home, household plots, hobbies: 161 articles

 


 

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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

Laser cooler for electronics 28.01.2013

A team of physicists led by Qihua Xiong of Nanyang Technological University in Singapore developed a new laser cooling technique by observing how nanostrips made from a different type of semiconductor, a compound of sulfur and cadmium, reacted to a laser beam.

Laser cooling systems are widely used in nuclear physics and in studies of the quantum properties of the microworld. Special laser traps and coolers make it possible to achieve temperatures close to absolute zero, which is practically impossible with other cooling methods. Despite the high development of this technology, it has not yet been adapted to work with semiconductor electronics based on silicon and gallium arsenide. As scientists explain, when irradiated with a laser, the atoms of the matter at which the device is directed absorb photons of its radiation. Under certain conditions, some of these photons are emitted back at a higher frequency, which consumes additional energy extracted from the thermal vibrations of atoms. Due to this, laser irradiation cools matter, rather than heats it up. This effect, the so-called anti-Stokes luminescence, is widely used in systems for laser cooling of atoms.

Xiong and colleagues found that anti-Stokes luminescence occurs in cadmium sulfide strips with a specially selected thickness and structure. Trying to achieve maximum cooling, scientists went through several options for laser emitters until they settled on a conventional green laser with a wavelength of 514 nm. According to the researchers, the green laser was able to cool coiled cadmium sulfide strips by 40 degrees Celsius at room temperature. As the temperature of the material and the environment decreases, the cooling efficiency gradually decreases until it reaches a minimum at 93 degrees Celsius below zero.

As the researchers note, a similar cooling technique can be applied to silicon microchips after additional research. Xiong and his colleagues believe that such laser "coolers" can be built into miniature electronic devices, due to the low power consumption and compactness of modern lasers.

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