H82050A0001 in stock German H82050A0001 electrical components H82050A0001 inventory

H82050A0001 electrical components are Schottky barrier diodes named after their inventor, Dr. Schottky. Schottky barrier diodes are not made using the principle of forming a PN junction by contact between P-type and N-type semiconductors, but rather using the principle of a metal-semiconductor junction formed by contact between metal and semiconductor. Therefore, Schottky barrier diodes are also called metal-semiconductor (contact) diodes or surface barrier diodes; they are a type of hot-carrier diode.

H82050A0001 electrical component parameters

The main parameters of potentiometers include nominal resistance value, rated power, resolution, sliding noise, resistance variation characteristic, wear resistance, zero-position resistance, and temperature coefficient. 1. Rated power: The maximum power allowed to be dissipated across the two fixed terminals of a potentiometer is its rated power. Note that the rated power is not equal to the power between the center tap and a fixed terminal. The rated power of a potentiometer refers to the maximum power allowed to be consumed under long-term continuous load at the specified rated temperature, when the atmospheric pressure is 87~107kPa. 2. Nominal resistance value: The nominal resistance value marked on the product, with series similar to those of resistors. 3. Tolerance class: The error range between the measured resistance value and the nominal resistance value allows for errors of 20%, 10%, 5%, 2%, and 1% depending on the precision class. The precision of precision potentiometers can reach 0.1%. 15. Resistance variation law: Refers to the relationship between resistance change and the rotation angle (or sliding travel) of the wiper contact. This relationship can take any functional form; common types include linear, logarithmic, and reverse logarithmic (exponential). In use, linear potentiometers are suitable as voltage dividers; reverse logarithmic (exponential) potentiometers are suitable as volume controls in radios, tape recorders, phonographs, and televisions. If a replacement of the same type is unavailable during maintenance, a linear type may be used as a substitute, but a logarithmic type should not be used. Logarithmic potentiometers are only suitable for tone control, etc.

H82050A0001 electrical component principles

In information technology, digital integrated circuits are the mainstay, processing information carried by digital signals, which take discrete values in terms of time and magnitude. However, signals in nature vary continuously in time and magnitude, such as wind sound and water flow; such signals are called analog signals. Correspondingly, circuits that process analog signals are called analog circuits, and integrated circuits used to process analog signals are called analog integrated circuits. Obviously, digital circuits cannot directly interface with the natural world; merely for the convenience of processing or transmission, and to fully utilize the advantages of digital systems, analog signals are first converted into digital signals, input into modern digital systems with large capacity, high speed, strong anti-interference capability, and good confidentiality for processing, and then reconverted into analog signals for output. The main component of integrated circuits is the transistor, and analog integrated circuits are no exception, except that they utilize the amplification effect of transistors, whereas digital integrated circuits utilize the switching effect of transistors. Early analog integrated circuits mostly used bipolar transistors. Due to the maturity of CMOS technology, the disadvantage of slower speed in early CMOS circuits has been overcome, and it offers the advantages of low power consumption and convenient process upgrades (CMOS scaling). Today, analog integrated circuits and mixed-signal integrated circuits (integrating digital and analog circuits) are also commonly designed and implemented using CMOS.

H82050A0001 electrical component principles

When two different conductors or semiconductors A and B form a loop with their ends connected, as long as the temperatures at the two junctions are different, with one end at temperature T, called the working end or hot end, and the other end at temperature T0, called the free end or cold end, an electromotive force will be generated in the loop. The direction and magnitude of this electromotive force depend on the material of the conductors and the temperatures at the two junctions. This phenomenon is called the "thermoelectric effect," the loop formed by the two conductors is called a "thermocouple," these two conductors are called "thermoelectrodes," and the generated electromotive force is called "thermoelectromotive force." Thermoelectromotive force consists of two parts: one part is the contact electromotive force between the two conductors, and the other part is the temperature difference electromotive force within a single conductor. In a thermocouple loop, the magnitude of the thermoelectromotive force depends only on the materials of the conductors forming the thermocouple and the temperatures at the two junctions, and is independent of the shape and size of the thermocouple. Once the materials of the two electrodes of the thermocouple are fixed, the thermoelectromotive force becomes a function of the difference between the temperatures t and t0 at the two junctions. That is, this relationship has been widely applied in practical temperature measurement. Because the cold end t0 remains constant, the thermoelectromotive force generated by the thermocouple changes only with the change in temperature at the hot end (measurement end), meaning that a specific thermoelectromotive force corresponds to a specific temperature. We can achieve the purpose of temperature measurement simply by measuring the thermoelectromotive force. The basic principle of thermocouple temperature measurement is that two conductors made of different materials form a closed loop; when there is a temperature gradient between the two ends, current flows through the loop, creating an electromotive force—thermoelectromotive force—between the two ends, which is known as the Seebeck effect. Two homogeneous conductors of different compositions serve as thermoelectrodes, with the higher-temperature end being the working end and the lower-temperature end being the free end, which is usually maintained at a constant temperature. Based on the functional relationship between thermoelectromotive force and temperature, thermocouple calibration tables are created; these tables are derived under the condition that the free end temperature is 4°C, and different thermocouples have different calibration tables. When a third metal material is introduced into the thermocouple loop, as long as the temperatures at the two junctions of this material are the same, the thermoelectromotive force produced by the thermocouple will remain unchanged, i.e., it is not affected by the introduction of the third metal into the loop. Therefore, during thermocouple temperature measurement, a measuring instrument can be connected, and after measuring the thermoelectromotive force, the temperature of the measured medium can be determined. When using a thermocouple to measure temperature, it is required that the temperature of its cold end (the measurement end is the hot end, and the end connected to the measurement circuit via leads is called the cold end) remains constant so that the magnitude of its thermoelectromotive force maintains a proportional relationship with the measured temperature. If the (ambient) temperature at the cold end changes during measurement, it will significantly affect the accuracy of the measurement. Taking certain measures at the cold end to compensate for the effects caused by changes in cold end temperature is referred to as normal cold-end compensation for thermocouples. Special compensating wires are used to connect to the measuring instrument. Calculation methods for thermocouple cold-end compensation: ① From millivolts to temperature: Measure the cold end temperature, convert it to the corresponding millivolt value, add it to the millivolt value of the thermocouple, and then convert to temperature; ② From temperature to millivolts: Measure the actual temperature and the cold end temperature, separately convert them to millivolt values, subtract to obtain the millivolt value, thereby determining the temperature.

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