Power supply. Schemes, articles of the Free Technical Library

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Power supply. Schemes, articles, descriptions

Free library / Schemes of radio-electronic and electrical devices

Power supply

We recommend reading in our Free Technical Library:

Small-sized antennas of portable stations of SV communication. Part 2

VHF Antenna Section. In portable and mobile CB radios, antennas with a length of 30 ... 100 cm for portable and up to 1,5 meters for mobile radios are used. Having calculated the input resistance of the active parts of such short pins for a frequency of 27 MHz, we obtain values from 0,5 Ohm for 30 cm to 10 Ohm for 1,5 m. Of course, it is unreasonable to connect such short pins to the output stage of the transmitter without appropriate coordination. Firstly, the efficiency of such a pin as an antenna is low, and secondly, matching the low resistance of the pin with the output stage of the transmitter is very difficult. The most rational solution that came to solving this problem was that the pin is part of a complex system, which is a shortened antenna. Hereinafter, the efficiency of the pin in such a system is considered. ... >>

Simple frequency counter

Section Beginner radio amateur. On the basis of only one K155LAZ microcircuit, using all its logical elements, it is possible to build a relatively simple device capable of measuring the frequency of an alternating voltage from about 20 Hz to 20 kHz. The input element of such a measuring device is a Schmitt trigger - a device that converts a sinusoidal alternating voltage supplied to its input into rectangular pulses of the same frequency. That is, it converts sinusoidal pulses with a gentle rise and fall to rectangular pulses with a steep rise and fall. The Schmitt trigger fires at a certain amplitude of the input signal. If it is less than the threshold value, there will be no pulse signal at the trigger output. ... >>

Proper mock-up chassis from Klausmobile

Section Ham Radio Technologies. The chassis parts of an antique Soviet device were used (secretly - a transistor tester). The trick is to make the chassis H-shaped, so that the highest components placed on the crossbar of the letter H remain inside the dimensions of the side cheeks. Then the layout can be turned on any of the six sides without fear of crushing the lamps. The components themselves are placed on a board made of laminated parquet boards. So it doesn’t take much time to transfer the prototype to the chassis and back. The next step is to place the hardware and power filter on one board (constant), and the amplifier itself on another (variable) ... >>

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Power Articles

Power Supplies
Chargers, batteries, galvanic cells
Protection of equipment from emergency operation of the network, uninterruptible power supplies
Voltage converters, rectifiers, inverters
Regulators of current, voltage, power
Surge Protectors
Miscellaneous electrical devices

Power Supplies

Articles on power supplies; power supply circuits; power supply descriptions: 404 articles

Chargers, batteries, galvanic cells

Articles on chargers, accumulators, galvanic cells; charger circuits; descriptions of chargers, batteries, galvanic cells: 272 articles

See also: Automobile. Batteries, chargers

Articles on automobile accumulators, chargers; schemes of car chargers; descriptions of car chargers, batteries: 49 articles

Protection of equipment from emergency operation of the network, uninterruptible power supplies

Articles on the protection of electrical equipment, uninterruptible power supply units; schemes of protection devices for electrical equipment, uninterruptible power supply units; descriptions of protection devices for electrical equipment, uninterruptible power supplies: 140 articles

Voltage converters, rectifiers, inverters

Articles on voltage converters, rectifiers, inverters; circuits of voltage converters, rectifiers, inverters; descriptions of voltage converters, rectifiers, inverters: 194 articles

Regulators of current, voltage, power

Articles on regulators of current, voltage, power; circuits of current, voltage, power regulators; descriptions of current, voltage, power regulators: 93 articles

Surge Protectors

Articles on voltage stabilizers; voltage stabilizer circuits; descriptions of voltage stabilizers: 173 articles

Miscellanea

Articles on various electrical devices; diagrams of various electrical devices; descriptions of various electrical devices: 36 articles

See also: Articles on power regulators, thermometers, heat stabilizers

Articles on power regulators, thermometers, heat stabilizers; schemes of power regulators, thermometers, heat stabilizers; descriptions of power regulators, thermometers, heat stabilizers: 94 articles

See also: Articles on clocks, timers, relays, load switches

Articles on clocks, timers, relays, load switches; diagrams of clocks, timers, relays, load switches; descriptions of clocks, timers, relays, load switches: 137 articles

Latest news of science and technology, new electronics:

Artificial leather for touch emulation 15.04.2024

In a modern technology world where distance is becoming increasingly commonplace, maintaining connection and a sense of closeness is important. Recent developments in artificial skin by German scientists from Saarland University represent a new era in virtual interactions. German researchers from Saarland University have developed ultra-thin films that can transmit the sensation of touch over a distance. This cutting-edge technology provides new opportunities for virtual communication, especially for those who find themselves far from their loved ones. The ultra-thin films developed by the researchers, just 50 micrometers thick, can be integrated into textiles and worn like a second skin. These films act as sensors that recognize tactile signals from mom or dad, and as actuators that transmit these movements to the baby. Parents' touch to the fabric activates sensors that react to pressure and deform the ultra-thin film. This ... >>

Petgugu Global cat litter 15.04.2024

Taking care of pets can often be a challenge, especially when it comes to keeping your home clean. A new interesting solution from the Petgugu Global startup has been presented, which will make life easier for cat owners and help them keep their home perfectly clean and tidy. Startup Petgugu Global has unveiled a unique cat toilet that can automatically flush feces, keeping your home clean and fresh. This innovative device is equipped with various smart sensors that monitor your pet's toilet activity and activate to automatically clean after use. The device connects to the sewer system and ensures efficient waste removal without the need for intervention from the owner. Additionally, the toilet has a large flushable storage capacity, making it ideal for multi-cat households. The Petgugu cat litter bowl is designed for use with water-soluble litters and offers a range of additional ... >>

The attractiveness of caring men 14.04.2024

The stereotype that women prefer "bad boys" has long been widespread. However, recent research conducted by British scientists from Monash University offers a new perspective on this issue. They looked at how women responded to men's emotional responsibility and willingness to help others. The study's findings could change our understanding of what makes men attractive to women. A study conducted by scientists from Monash University leads to new findings about men's attractiveness to women. In the experiment, women were shown photographs of men with brief stories about their behavior in various situations, including their reaction to an encounter with a homeless person. Some of the men ignored the homeless man, while others helped him, such as buying him food. A study found that men who showed empathy and kindness were more attractive to women compared to men who showed empathy and kindness. ... >>

Random news from the Archive

Transistors that work 10 times faster than brain synapses 03.08.2022

Researchers at the Massachusetts Institute of Technology have developed programmable transistors that operate 10 times faster than brain synapses. The technology used for analog machine learning provides not only high data processing speed, but also good energy efficiency.

The working mechanism of the device is to electrochemically insert a tiny ion, a proton, into an insulating oxide to modulate its electronic conductivity. Scientists used a powerful electric field to accelerate protons and put ion transistors into nanosecond mode of operation.

The researchers note that the secret of new devices in the use of inorganic phosphorus silicate glass. It provides ultra-fast movement of protons, since it contains many nanometer-sized pores, the surfaces of which provide diffusion paths for elementary particles. It can withstand very strong pulsed electric fields.

The action potential in biological cells rises and falls on a time scale of milliseconds as a potential difference of approximately 0,1 volts is limited by the stability of water. In our work, we apply up to 10 volts through a special, nano-thick, hard glass film that produces protons without damaging it. And the stronger the field, the faster the ion devices work.

In the human brain, learning occurs by strengthening and weakening connections between synapses. Deep neural networks use a similar strategy when the weights of the nodes (neurons) are programmed with learning algorithms. When using processors, increasing and decreasing the electrical conductivity of proton resistors provides analog machine learning.

Conductivity is controlled by the movement of protons. To increase conductivity, more protons are pushed into the channel in the resistor, and to decrease conductivity, protons are expelled. This is achieved by using an electrolyte (similar to a battery) that produces protons but blocks electrons. Increasing the speed of protons significantly speeds up the process of machine learning.

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