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erco leuchten 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 semiconductor and N -type semiconductor, 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 hot-carrier diodes.

erco leuchten electrical component parameters

The main characteristic parameters of quartz crystal resonators include nominal frequency, adjustment frequency deviation, temperature frequency deviation, equivalent resistance, drive level, load capacitance, shunt capacitance, aging rate, and temperature range. (1) Nominal frequency is the specified resonant center frequency of the resonator under prescribed conditions. (2) Adjustment frequency deviation is the maximum deviation of the operating frequency from the nominal frequency at the reference temperature under prescribed conditions. (3) Temperature frequency deviation is the permissible deviation from the operating frequency at the reference temperature over the entire operating temperature range under prescribed conditions. (4) Reference temperature is the specified ambient temperature when measuring quartz crystal resonator parameters. For oven-controlled quartz crystal resonators, it is generally the midpoint of the operating temperature range; (5) Load resonant resistance is the resistance value at the load resonant frequency when the quartz crystal resonator is connected in series with the specified external capacitance. (6) Drive level refers to the effective power consumed by the quartz crystal resonator during operation; it is a measure of the excitation state applied to the quartz crystal element. In actual use, the drive level can be adjusted; strong excitation facilitates oscillation startup, while excessively weak excitation degrades frequency stability or may prevent oscillation entirely. (7) Load capacitance refers to the effective external capacitance that, together with the quartz crystal resonator, determines the load resonant frequency. Load capacitance can be appropriately adjusted according to specific conditions; through adjustment, the resonator's operating frequency can generally be tuned to the nominal value. (8) Shunt capacitance refers to the static capacitance between the two pins of the quartz crystal resonator. (9) Aging rate refers to the error caused by changes in quartz crystal aging over time. (10) Temperature range refers to the permissible variation range of the ambient temperature during operation.

erco leuchten electrical component principles

Bipolar junction transistors are divided into two types by material: germanium transistors and silicon transistors. Each type has two structural forms, NPN and PNP, but the most commonly used are silicon NPN and germanium PNP transistors. (Here, N means negative; N -type semiconductor is formed by adding phosphorus to high-purity silicon to replace some silicon atoms, generating free electrons for conduction under voltage stimulus, while P means positive; boron is added to replace silicon, creating numerous holes to facilitate conduction). Apart from different power supply polarities, their operating principles are identical. The following introduces only the current amplification principle of NPN silicon transistors. An NPN transistor consists of 3 pieces of N -type semiconductor sandwiching one piece of P -type semiconductor. The PN junction formed between the emitter region and the base region is called the emitter junction, and the PN junction formed between the collector region and the base region is called the collector junction. The three leads are called the emitter e, base b, and collector c. When the potential at point b is a few tenths of a volt higher than the potential at point e, the emitter junction is forward-biased. When the potential at point C is several volts higher than the potential at point b, the collector junction is reverse-biased, and the collector power supply Ec must be higher than the base power supply Eb. During transistor manufacturing, the majority carrier concentration in the emitter region is intentionally made higher than that in the base region, the base region is made very thin, and impurity content is strictly controlled. Thus, once power is applied, due to the forward bias of the emitter junction, the majority carriers (electrons) in the emitter region and the majority carriers (holes) in the base region easily diffuse across the emitter junction toward each other. However, since the former concentration is much higher than the latter, the current through the emitter junction is basically an electron flow, known as the emitter electron current.

erco leuchten 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. By principle, 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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