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Metal detectors. Schemes, articles, descriptions

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metal detectors

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How to choose an all-wave television antenna



Section Television antennas. Surely many, at least once asked this question. This, at first glance, a simple matter, in fact turns out to be quite a difficult task. Even an experienced specialist, having assessed the reception conditions, cannot give a 100% accurate conclusion on which equipment should be used in a particular case. ... >>

FM generator for the range of 90 ... 110 MHz



Section Radio reception. Figure 1 shows an electrical circuit diagram of an FM generator capable of operating in the FM band. The generator can be used in conjunction with high-quality sound-reproducing equipment. The generator itself is made on a field tetrode VT1 type BF900. The use of a double insulated gate field effect transistor made it possible to obtain a very stable oscillator with a very low noise level in the output signal. The desired frequency is set by the tuning capacitor C4. To ensure the required frequency deviation and low non-linear distortion, a constant bias voltage is supplied to the VD1 varicap from the variable resistor R2 engine. The low frequency input signal enters the device through the blocking capacitor C1 ... >>

Two-transistor crystal oscillator



Section Nodes of amateur radio equipment. Generators, heterodynes. The generator (see figure) can be useful when setting up various AM and FM amateur receivers. It consists of quartz and low-frequency oscillators, made respectively on transistors T2 and T1. The low frequency signal through the transformer Tr1 affects the high frequency signal. When using quartz at a frequency of 8 MHz, the modulated signal is well audible at the eighteenth harmonic (144 MHz). The type of modulation in this case is mixed - AM and FM. The signal frequency of the modulating oscillator is about 1 kHz. The resistance of the primary winding of the transformer is 300-500 ohms, and the secondary - 2,5-8 ohms. Choke Dr1 wound on a resistor with a resistance of 100 ohms ... >>

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Articles on metal detectors

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

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Latest news of science and technology, new electronics:

Using Apple Vision Pro during surgery 16.03.2024

The medical team at Cromwell Hospital in London used Apple Vision Pro for the first time during two spinal surgeries. This event confirms the headset's potential as a medical tool that will change the way surgical practice is performed. Although the doctors themselves did not use Vision Pro, the operating room nurse worked with virtual reality using glasses while preparing and performing procedures. The headset made it possible to view virtual screens in the operating room, select instruments and monitor the progress of the operation. Software developed by eXeX, a company that specializes in creating artificial intelligence-based applications for surgery, has significantly improved the patient care process. Using Apple Vision Pro opens up new opportunities for developing healthcare applications such as clinical education, surgical planning, training and medical imaging. Implementation of Apple Vision Pro in the medical industry ... >>

Carbon storage in the North Sea 16.03.2024

Norwegian Energy Minister Terje Åsland has announced the launch of the Longship project, which aims to create a central carbon dioxide storage facility in the North Sea. This ambitious project is valued at $2,6 billion and aims to apply CCS (carbon capture and storage) technology to mitigate the impact of climate change. Norway already has experience in CCS, thanks to the successful Sleipner and Snohvit projects, and is now looking to increase the amount of carbon sealed beneath the seabed. Longship's plan calls for capacity to capture and store 1,5 million tons of carbon annually over 25 years. Despite the positive outlook, there are concerns about the long-term consequences of such storage. However, proponents of the project argue that offshore carbon storage has a number of advantages, including minimal environmental impact. The Longship project is carried out with the participation of Equinor, Shell and TotalEnergies through the joint venture Northern Li ... >>

Mini-organs grown from human amniotic fluid 15.03.2024

An international team of scientists led by Professor Fan Xiulin from Zhejiang University has developed a unique method of growing mini-organs from cells found in human amniotic fluid. This significant medical breakthrough could lead to improved diagnosis and treatment of congenital diseases. The organoids, which are three-dimensional cellular structures that mimic organs on a smaller scale, were grown from lung, kidney and small intestine cells found in amniotic fluid. This method opens up new possibilities for studying various fetal conditions and may be the key to early diagnosis and treatment of birth defects. Although no treatment has yet been attempted, the scientists hope their research will help combat the serious congenital diseases that affect millions of newborns each year. This breakthrough could change medical interventions by making it possible to diagnose and treat congenital diseases. ... >>

Random news from the Archive

Capacious and cheap Li-Ion battery 10.11.2012

CalBattery has developed an electrode that increases the capacity of lithium-ion batteries by 3 times while reducing their cost by 70%.

The results of independent testing of a prototype of a new lithium-ion cell confirm the high performance of an electrode based on a silicon-graphene composite material. The energy density in the new battery is 3 times higher than in the conventional one, and the specific capacitance of the electrode is 4 times higher.

Eight months of work by specialists from CalBattery and Argonne National Laboratory show that the new battery has a good chance of becoming a new generation of batteries and conquering the commercial market. Unlike most commercial lithium-ion batteries, the new battery has an energy density of 525 Wh/kg and a specific electrode capacity of 1250 mAh/g. At the same time, modern lithium-ion batteries have corresponding indicators of 100-180 W * h / kg and 325 mAh / g.

The new battery is 300% better than current batteries, and in addition, the new technology promises a roughly 70% reduction in the life cycle cost of batteries used in consumer electronics, electric vehicles, and more.

The key to the future of the battery was the discovery of a process that stabilizes the silicon in the anode of a lithium battery. Although silicon absorbs lithium ten times better than any other material, it degrades quickly during charge/discharge cycles. The scientists experimented with several materials for the electrode and electrolyte. As a result, it was possible to create a composite electrode based on graphene and silicon, which is significantly superior to all existing commercial technologies. The developers believe that a new type of electrode can replace conventional graphite electrodes in 2-3 years and significantly increase the duration of operation of numerous devices that are powered by batteries.

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