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ELKO EP electrical components are varactor diodes, also known as "variable reactance diodes," made using the characteristic that the junction capacitance of a PN junction changes with the applied voltage when reverse-biased. As the reverse bias voltage increases, the junction capacitance decreases; conversely, it increases. The capacitance of a varactor diode is generally small, with a maximum value ranging from tens of pF to hundreds of pF. It is mainly used in high-frequency circuits for automatic tuning, frequency modulation, and phase adjustment, such as serving as a variable capacitor in the tuning circuit of a television receiver. Main parameters include: zero-bias junction capacitance, zero-bias quality factor, reverse breakdown voltage, center reverse bias voltage, nominal capacitance, capacitance variation range (in picofarads), and cutoff frequency.

ELKO EP electrical component classification

1, Fuse resistors: Also called fusible resistors, they serve the dual function of a resistor and a fuse under normal conditions. When a circuit fault causes their power consumption to exceed the rated power, they blow like a fuse to disconnect the circuit. Fuse resistors generally have low resistance values and low power ratings. 10, Sensitive resistors: These refer to resistors whose resistance values are sensitive to certain physical quantities (such as temperature, humidity, light, voltage, mechanical force, and gas concentration). When these physical quantities change, the resistance of the sensitive resistor changes accordingly, presenting different resistance values. Based on sensitivity to different physical quantities, sensitive resistors can be classified into thermistors, humidity-sensitive resistors, photoresistors, varistors, force-sensitive resistors, magnetoresistors, and gas-sensitive resistors. The materials used for sensitive resistors are almost all semiconductor materials, so these resistors are also called semiconductor resistors. The resistance of a thermistor changes with temperature; if the resistance decreases as temperature rises, it is a negative temperature coefficient (NTC) thermistor. NTC thermistors are widely used and can be further divided into general-purpose NTC thermistors, voltage-stabilizing NTC thermistors, and temperature-measuring NTC thermistors. A photoresistor's resistance changes with the intensity of incident light; when incident light increases, the resistance of the photoresistor decreases, and when incident light weakens, the resistance increases.

ELKO EP electrical component functions

Low-power resistors are typically composed of carbon film encapsulated in a plastic housing, while high-power resistors are usually wirewound resistors, made by winding metal wire with high resistivity around a ceramic core. If a resistor's resistance value is close to zero ohms (for example, a large-cross-section wire between two points), the resistor offers no obstruction to current, and the circuit parallel to this resistor is short-circuited, resulting in infinite current. If a resistor has infinite or very high resistance, the circuit series-connected with this resistor can be regarded as an open circuit, with zero current. Resistors commonly used in industry fall between these two extremes; they have a certain resistance and allow a certain amount of current to pass, but the current is not as large as in a short circuit. The current-limiting function of a resistor is similar to the effect of a small-diameter pipe restricting water flow between two large-diameter pipes. Resistance, usually abbreviated as R, is a fundamental property of a conductor, related to the conductor's size, material, and temperature. Ohm's law states that I = U/R, so R = U/I. The basic unit of resistance is the ohm, represented by the Greek letter "Ω". It is defined as the resistance corresponding to one ampere of current generated when one volt of voltage is applied across a conductor. The main function of a resistor is to impede the flow of current. In fact, "resistance" refers to a property, while "resistor" in electronic products usually refers to the component itself. Ohm is often abbreviated as "Ohm". Common units for expressing resistance values also include kiloohm (kΩ), megaohm (MΩ), and milliohm (m Ω).

ELKO EP electrical component structure

A thermopile is a pyroelectric infrared sensor, a device composed of thermocouples. It is widely used as a temperature detection device in fields such as ear thermometers, radiation thermometers, electric ovens, and food temperature detection. It consists of two or more thermocouples connected in series, where the thermoelectric potentials output by each thermocouple superimpose on each other. Used to measure small temperature differences or average temperatures. Structure of a thermopile: The radiation receiving surface is divided into several sections, each connected to a thermocouple. Connecting them in series forms a thermopile. Depending on the application, practical thermopiles can be made into filament types and thin-film types, as well as multi-channel and array devices.

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