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xABBELSYNN electrical component is one of the earliest devices for amplifying electrical signals. The cathode electron emission part, control grid, accelerating grid, and anode (plate) lead, enclosed in a glass container (usually a glass tube), are welded to the tube base. It uses an electric field to inject electrons into the control grid in a vacuum to modulate the signal, and obtains signal data with different parameters after signal amplification or feedback oscillation at the anode. Early applications included electronic products such as televisions, radios, and loudspeakers. Later, it was gradually replaced by amplifiers and integrated circuits made of semiconductor materials, but in some high-fidelity audio equipment, vacuum tubes with low noise and high stability coefficients are still used as audio power amplification devices (in Hong Kong, vacuum tube power amplifiers are called "tube amplifiers").

xABBELSYNN electrical component performance

(1) Electromotive force: Electromotive force is the difference between the equilibrium electrode potentials of two electrodes. (2) Rated capacity: The theoretical capacity of a battery can be precisely calculated based on the amount of active electrode material in the battery reaction equation and the electrochemical equivalent of the active material calculated according to Faraday's law. Due to possible side reactions in the battery and special design requirements, the actual capacity of the battery is often lower than the theoretical capacity. (3) Rated voltage: The typical operating voltage of a battery at room temperature, also known as nominal voltage. It serves as a reference when selecting different types of batteries. The actual operating voltage of a battery equals the difference between the equilibrium electrode potentials of the positive and negative electrodes under different usage conditions. It is related only to the type of electrode active material, not to the quantity of active material. Battery voltage is essentially DC voltage, but under certain special conditions, phase changes in metal crystals or certain formation films caused by electrode reactions can cause slight voltage fluctuations, a phenomenon known as noise. The amplitude of the fluctuation is very small, but the frequency range is wide, so it can be distinguished from self-excited noise in the circuit. (4) Open-circuit voltage: The terminal voltage of a battery in an open-circuit state is called the open-circuit voltage. The open-circuit voltage of a battery equals the difference between the positive electrode potential and the negative electrode potential when the battery is in an open circuit (i.e., no current flows through the two poles). The open-circuit voltage of a battery is indicated by V open. The open-circuit voltage of a battery is generally less than its electromotive force. This is because the electrode potentials established by the two poles in the electrolyte solution are usually not equilibrium electrode potentials, but stable electrode potentials. Generally, the open-circuit voltage of a battery can be approximated as its electromotive force. (5) Internal resistance: The internal resistance of a battery refers to the resistance encountered when current passes through the interior of the battery. It includes ohmic internal resistance and polarization internal resistance; polarization internal resistance further includes electrochemical polarization internal resistance and concentration polarization internal resistance. Due to the presence of internal resistance, the operating voltage of a battery is always less than the electromotive force or open-circuit voltage of the battery. The internal resistance of a battery is not constant; it changes continuously over time (gradually increasing) during charging and discharging processes because the composition of active materials, the concentration of the electrolyte, and the temperature are constantly changing. Ohmic internal resistance obeys Ohm's law. Polarization internal resistance increases with increasing current density, but the relationship is not linear; it often increases as current density increases. Internal resistance is an important indicator determining battery performance; it directly affects the battery's operating voltage, operating current, output energy, and power. For a battery, the smaller the internal resistance, the better. (6) Impedance: A battery has a large electrode-electrolyte interface area, so the battery can be equivalent to a series circuit of a large capacitor with a small resistor and inductor. However, the actual situation is much more complex, especially since the impedance of the battery changes with time and DC level. The measured impedance is only valid for the specific measurement state. (7) Charge/discharge rate: There are two representation methods: hour rate and C-rate. The hour rate expresses the charge/discharge rate in terms of charge/discharge time; numerically, it equals the rated capacity of the battery (ampere-hours) divided by the specified charge/discharge current (amperes), resulting in hours. The C-rate is another way to express the charge/discharge rate, and its value is the reciprocal of the hour rate. The discharge rate of a primary battery is expressed by the time it takes to discharge through a fixed resistor to the cutoff voltage. The discharge rate has a significant impact on battery performance. (8) Service life: Storage life refers to the maximum allowable storage time from battery manufacture to the start of use, measured in years. The total period including the storage period and the usage period is called the validity period of the battery. The storage life of batteries is divided into dry storage life and wet storage life. Cycle life is the maximum number of charge/discharge cycles a rechargeable battery can achieve under specified conditions. When specifying cycle life, the charge/discharge cycle test regimen must also be specified, including charge/discharge rate, depth of discharge, and ambient temperature range. (9) Self-discharge rate: The rate at which a battery loses capacitance on its own during storage. It is expressed as the percentage of capacitance lost due to self-discharge per unit storage time relative to the capacity before storage.

xABBELSYNN electrical component parameters

(1) Nominal capacitance is the capacitance marked on the capacitor. However, there is a deviation between the actual capacitance of the capacitor and the nominal capacitance; the accuracy grade corresponds to the allowable error. General capacitors commonly use grades I, II, and III, while electrolytic capacitors use grades IV, V, and VI to indicate capacitance precision, selected according to application. The capacitance value of an electrolytic capacitor depends on the impedance presented during operation under AC voltage. The capacitance value changes with variations in operating frequency, temperature, voltage, and measurement method. The unit of capacitance is F (Farad). Since a capacitor is a "container" for storing electric charge, there is the issue of "capacity" size. To measure the ability of a capacitor to store electric charge, the physical quantity of capacitance is defined. A capacitor can only store electric charge under the action of an applied voltage. Different capacitors may store different amounts of charge under voltage action. Internationally, it is uniformly stipulated that when a DC voltage of 1 volts is applied to a capacitor, the amount of charge it can store is the capacitance of that capacitor (i.e., the charge per unit voltage), represented by the letter C. The basic unit of capacitance is the Farad (F). (2) Rated voltage is the maximum DC voltage that can be continuously applied to the capacitor at the minimum ambient temperature and rated ambient temperature. If the operating voltage exceeds the withstand voltage of the capacitor, the capacitor will break down, causing damage. In practice, as the temperature rises, the withstand voltage will decrease. (3) Insulation resistance. When DC voltage is applied to a capacitor, leakage current is generated; the ratio of the two is called insulation resistance. When the capacitance is small, its value mainly depends on the surface state of the capacitor. Generally, the larger the insulation resistance, the better. (4) Loss. The energy consumed by heat generation per unit time in a capacitor under the action of an electric field is called loss. Loss is related to frequency range, dielectric medium, conductivity, and the resistance of the metal parts of the capacitor. (13) Frequency characteristics. As frequency increases, the capacitance of general capacitors tends to decrease. When a capacitor operates below its resonant frequency, it exhibits capacitive behavior; when it exceeds its resonant frequency, it exhibits inductive behavior, at which point it is no longer a capacitor but an inductor. Therefore, it is essential to avoid operating capacitors above their resonant frequency.

xABBELSYNN electrical component performance

The main performance indicators of a loudspeaker include sensitivity, frequency response, rated power, rated impedance, directivity, and distortion. (1) Rated power: Loudspeaker power is divided into nominal power and maximum power. Nominal power, also called rated power or non-distortion power, refers to the maximum input power allowed within the rated non-distortion range of the loudspeaker. The power marked on the loudspeaker's label and technical manual is this value. Maximum power refers to the peak power that the loudspeaker can withstand at any instant. (2) Rated impedance: The impedance of a loudspeaker is generally related to frequency. (3) Frequency response: When audio signals of the same voltage but different frequencies are applied to a loudspeaker, the resulting sound pressure will change. Generally, the sound pressure produced at mid-frequencies is higher, while the sound pressure produced at low and high frequencies is lower. The frequency range of high and low tones where the sound pressure drops to a certain value of the mid-frequency sound pressure is called the frequency response characteristic of the loudspeaker. (4) Distortion: The phenomenon where a loudspeaker cannot faithfully reproduce the original sound is called distortion. There are two types of distortion: frequency distortion and nonlinear distortion. Frequency distortion is caused by stronger reproduction of signals at certain frequencies and weaker reproduction at others, disrupting the original proportion of high and low sound intensities and changing the original timbre. Nonlinear distortion is caused by incomplete consistency between the vibration of the loudspeaker's vibration system and the signal fluctuation, adding new frequency components to the output sound waves. (5) Directivity characteristic: Used to characterize the distribution of sound pressure radiated by the loudspeaker in various directions in space. The higher the frequency, the narrower the directivity; the larger the cone, the stronger the directivity.

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