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Metal detectors. Schemes, articles, descriptions

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metal detectors

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Regulated power supply with overload alarm, 220/0-15 volts 1 amp



Section Power supplies. Sound signaling allows the user to quickly respond to an emergency situation if, during experiments with various electronic equipment, an overload of the power source occurs. The power supply circuit with an audible signaling device for exceeding current consumption is shown in the figure. The VD1-VD4 diode rectifier is powered by a transformer whose secondary winding is designed for a voltage of 18 V at a load current of at least 1 A. The adjustable voltage regulator is made on transistors VT2 ... VT5 according to a well-known scheme. Variable resistor R3 at the output of the stabilizer can be set to a voltage from 0 to +15 V ... >>

Charging with a stable current



Section Chargers, batteries, galvanic cells. There are several methods for charging batteries: direct current with voltage control on the battery being charged, at constant voltage, controlling the charging current, according to Woobbridge (ampere-hour rule), etc. Each of these methods has both advantages and disadvantages. In fairness, it should be noted that the most common, and reliable, is still DC charging. The emergence of microcircuit voltage stabilizers that allow you to work in the current stabilization mode makes the use of this method even more attractive. In addition, only direct current charging provides the best recovery of battery capacity, when the process is divided, as a rule, into two stages: charging with rated current and half as much ... >>

Installation of electric meters and wiring to them



Electrical section. Electric meters should be installed in places that are easily accessible for inspection and taking readings of electricity consumption. They are installed in dry rooms. The temperature in the room where the electricity meters are installed, in winter and in the off-season, should not be lower than 0 °C. Electric meters are installed in cabinets, on panels, shields, in niches, on walls that have a rigid structure. It is allowed to mount electric meters on wooden, plastic, metal shields. Electric meters are installed in such a way that the distance from the floor of the room to the terminal box of the electric meter is from 0,8 to 1,7 m. Sometimes you can install the meter at a height of 0,4 m from the floor. If there is a danger of mechanical damage to the electric meter or it is installed in a place accessible to unauthorized persons (passage, stairwell, etc.), then it must be installed in a lockable cabinet with a window at the level of the dial ... >>

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Articles on metal detectors

Articles on metal detectors; schemes of metal detectors; descriptions of metal detectors: 122 articles

Theory of metal detectors

 


 

Practical designs of metal detectors

 


 

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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

Growth of the consumer robot market 09.08.2019

A new study by analytics firm Juniper Research has predicted that more than 2024 million consumer robots will be released in 74. For comparison: 28 million are expected to be released this year.

At the same time, robots helping around the house, such as robotic vacuum cleaners or robotic lawn mowers, will be shipped 19 million units this year, and 2024 million units in 20. In other words, growth will be driven by other segments

Analysts believe that vendors will focus on the educational side of robots, in particular by offering tools for programming them, and adding new features to increase value in the eyes of consumers. It is these factors that will drive growth in demand for consumer robots over the next five years.

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