ELEKTROPRISTROJ electrical components German ELEKTROPRISTROJ models ELEKTROPRISTROJ prices

ELEKTROPRISTROJ electrical components: Names for circuit boards include ceramic circuit boards, alumina ceramic circuit boards, aluminum nitride ceramic circuit boards, wiring boards, PCB boards, aluminum substrate boards, high-frequency boards, thick copper boards, impedance boards, PCB, ultra-thin wiring boards, ultra-thin circuit boards, and printed (copper etching technology) circuit boards. Circuit boards miniaturize and visualize circuits, playing an important role in the mass production of fixed circuits and optimizing appliance layout. Circuit boards may be referred to as printed wiring boards or printed circuit boards. Flexible wiring boards and flexible circuit boards are printed circuit boards made with polyimide or polyester film as the base material, featuring high reliability and excellent flexibility. They are characterized by high wiring density, light weight, thin profile, and good bendability.) and rigid-flex boards—the emergence and development of FPC and PCB have spurred the new product category of rigid-flex boards. Therefore, a rigid-flex board is a circuit board formed by combining flexible wiring boards and rigid wiring boards through lamination and other processes according to relevant process requirements, possessing both FPC characteristics and PCB characteristics.

ELEKTROPRISTROJ electrical component parameters

1. Voltage temperature coefficient: Refers to the rate of change of the nominal voltage of a varistor within a specified temperature range, i.e., the relative change in voltage across the varistor when the temperature changes while the current through the varistor remains constant. 2. Current temperature coefficient: Refers to the relative change in current flowing through the varistor when the temperature changes while the voltage across the varistor remains constant. 3. Nominal voltage: Refers to the voltage value across the varistor when DC current flows through it. 4. Voltage ratio: Refers to the ratio of the voltage generated by the current of the varistor to the voltage generated by the current of the varistor. 5. Maximum limiting voltage: Refers to the highest voltage value that can be withstand across the varistor. 6. Leakage current: Also known as standby current, refers to the current flowing through the varistor under specified temperature and maximum DC current conditions. 7. Residual voltage ratio: When the current through the varistor is at a certain value, the voltage generated across it is called the residual voltage for that current value. The residual voltage ratio is the ratio of the residual voltage to the nominal voltage. 8. Surge current capacity: Also known as surge current, refers to the maximum pulse (peak) current value allowed to pass through the varistor under specified conditions (specified time intervals and number of times, applying standard impulse current). 9. Static capacitance: Refers to the inherent capacitive capacity of the varistor itself. 10. Insulation resistance: Refers to the resistance value between the leads (pins) of the varistor and the insulated surface of the resistive body. 13. Voltage nonlinearity coefficient: Refers to the ratio of the static resistance value to the dynamic resistance value of the varistor under a given applied voltage.

ELEKTROPRISTROJ electrical component structure

1. The cathode of an electron tube is the component used to emit electrons, divided into oxide cathodes and thoriated tungsten carbide cathodes. Generally, oxide cathodes are indirectly heated; they use a dedicated filament to heat the cathode body coated with barium oxide, etc., for thermionic emission. Thoriated tungsten carbide cathodes are generally directly heated; thermionic emission is produced simply by heating, so they serve as both filament and cathode. Theoretically, thoriated tungsten carbide cathodes have a much longer lifespan than oxide cathodes. Thoriated tungsten carbide cathodes are most widely used in high-power transmitter tubes, while oxide cathodes are generally used in transmitter tubes with output power below 1kW. Mesh cathodes are made into cylindrical shapes using thinner thoriated tungsten wires. Their advantages are: (1) Because they are woven from many thoriated tungsten wires, they have a larger permeance. (2) It is easier to achieve smaller cathode-grid spacing, which helps improve transconductance. (3) Since the filament has a mesh structure, the current in each individual wire is small, the local magnetic field is weak, and thus the AC hum generated by the cathode current is also smaller. 2. The grids of electron tubes are divided into first grid and second grid according to their different roles in the tube, sometimes also called control grid and screen grid. The main function of the first grid is to control cathode current, while the function of the second grid is to shield the first grid from the influence of the plate. The grid structure relates to its own mechanical strength and heat dissipation effect, and determines whether the tube can work stably. To reduce electron transit time, the grid-cathode spacing is made very short, even less than 1mm. Therefore, manufacturers mostly use materials with high mechanical strength, high thermal conductivity, good radiation coefficient, and high melting point to make the grids, to avoid thermal contact between electrodes at such small spacings. The first and second grids must be strictly aligned, so that the screen grid captures fewer electrons, reducing screen grid dissipation, improving current distribution and linearity. 7. The anode of an electron tube is the electrode that collects most of the electrons emitted by the cathode. During operation, due to electron bombardment of the plate surface and thermal radiation from other electrodes, a large amount of heat is generated at the plate. Since the power dissipation density of the plate is tens to hundreds of watts per square centimeter, natural radiation or conduction cooling is no longer sufficient for such high power densities. Therefore, forced cooling methods must be used. Common methods include air cooling, water cooling, and evaporative cooling.

ELEKTROPRISTROJ electrical component classification

Generator classifications include: (1) Generators are divided into DC generators and AC generators; (2) AC generators are divided into synchronous generators and asynchronous generators (rarely used); (3) AC generators can also be divided into single-phase generators and three-phase generators. There are many types of generators. Principally, they are divided into synchronous generators, asynchronous generators, single-phase generators, and three-phase generators. By generation method, they are divided into steam turbine generators, hydroelectric generators, diesel generators, gasoline generators, etc. By energy source, they are divided into thermal power generators, hydropower generators, etc.

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