evn elektro electrical components Germany evn elektro models evn elektro prices

evn elektro electrical components are semiconductor triodes, also known as bipolar junction transistors or crystal triodes, which are semiconductor devices that control current. Their function is to amplify weak signals into electrical signals with larger amplitudes, and they are also used as contactless switches. Triodes are one of the basic semiconductor components, featuring current amplification capabilities, and are core components in electronic circuits. A triode is formed by fabricating two closely spaced PN junctions on a single semiconductor substrate; these two PN junctions divide the entire semiconductor into three parts: the base region in the middle, and the emitter and collector regions on the sides. The configurations include PNP and NPN types.

evn elektro electrical component classification

For most conductors, at a certain temperature, the resistance remains almost constant at a fixed value; such resistors are called linear resistors. For some materials, the resistance changes significantly with current (or voltage), and their volt-ampere characteristic is a curve; such resistors are called nonlinear resistors. For a nonlinear resistor under a given voltage (or current), the ratio of voltage to current is the static resistance at that operating point, and the slope of the volt-ampere characteristic curve is the dynamic resistance. The expression of nonlinear resistor characteristics is complex, but these nonlinear relationships are widely applied in electronic circuits.

evn elektro electrical component features

1. The function of a varactor diode is based on the principle that the capacitance between PN junctions is variable; it is a semiconductor device used as a variable capacitor in high-frequency tuning, communication, and other circuits. Varactor diodes belong to the category of reverse-biased diodes; changing the reverse bias voltage on the PN junction changes the PN junction capacitance. The higher the reverse bias voltage, the lower the junction capacitance; the relationship between reverse bias voltage and junction capacitance is nonlinear. 2. Diagram of the relationship between varactor diode capacitance and reverse bias voltage: (a) Increased reverse bias causes decreased capacitance; (b) Decreased reverse bias causes increased capacitance. The capacitance tolerance range defines the specified capacitance range for a varactor diode. Datasheets will display the minimum, nominal, and maximum values, which are often plotted on graphs.

evn elektro electrical component principles

A resistor consists of three parts: the resistive element, the backbone, and the leads (for solid-core resistors, the resistive element and backbone are integrated into one), but only the resistive element determines the resistance value. The volt-ampere characteristic graphically represents the relationship between voltage and current at the resistor terminals; when voltage and current are proportional (the characteristic is a straight line), it is called a linear resistor; otherwise, it is called a nonlinear resistor. The rated power of a resistor refers to the maximum power allowed to be dissipated during continuous operation at the rated temperature (maximum ambient temperature) tR. For each type of resistor, a maximum working voltage is also specified; that is, even if the rated power is not reached, the maximum working voltage must not be exceeded when the resistance value is high. The rated power of a resistor refers to the maximum power allowed to be consumed during long-term continuous operation in DC or AC circuits. Load characteristics: When the ambient working temperature is below tR, the resistor must not exceed its rated power; when exceeding tR, the load power must be derated. Each type of resistor has specified load characteristics. In addition, the allowable load decreases under low atmospheric pressure. Under pulse load conditions, the average pulse power is far lower than the rated power, and separate specifications generally apply.

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