Conrad Electronic electrical components German Conrad Electronic models Conrad Electronic prices

Conrad Electronic electrical components include single heterojunction, double heterojunction, and quantum well laser diodes. Quantum well laser diodes offer the advantages of low threshold current and high output power, making them mainstream products in market applications. Compared to lasers, laser diodes have the advantages of high efficiency, small size, and long service life, but their low output power, poor linearity, and less-than-ideal monochromaticity greatly limit their application in cable television systems, preventing the transmission of multi-channel, high-performance analog signals. In the return module of a bidirectional optical receiver, the upstream transmitter generally uses quantum well laser diodes as the light source.

Conrad Electronic electrical component classification

Thyristors have multiple classification methods: (1) Classification by turn-off, conduction, and control methods: Thyristors can be divided into conventional thyristors, bidirectional thyristors, reverse-conducting thyristors, gate turn-off thyristors, BTG thyristors, temperature-controlled thyristors, and light-controlled thyristors, among others. (2) Classification by pins and polarity: Thyristors can be divided into two-pin thyristors, three-pin thyristors, and four-pin thyristors based on their pins and polarity. (3) Classification by package type: Thyristors can be divided into three types based on their package: metal-packaged thyristors, plastic-packaged thyristors, and ceramic-packaged thyristors. Among these, metal-packaged thyristors are further divided into bolt-type, flat-type, and round-case types; plastic-packaged thyristors are divided into types with heat sinks and types without heat sinks. (4) Classification by current capacity: Thyristors can be divided into high-power, medium-power, and low-power thyristors based on current capacity. Typically, high-power thyristors mostly use metal casing packages, while medium- and low-power thyristors mostly use plastic or ceramic packages. (5) Classification by turn-off speed: Thyristors can be divided into conventional thyristors and high-frequency (fast) thyristors based on their turn-off speed. (6) Zero-crossing triggering - generally used for power regulation, i.e., triggering occurs when the phase of the sinusoidal AC voltage crosses zero; triggering must occur at the zero-crossing point to conduct the thyristor. (7) Non-zero-crossing triggering - the thyristor can be triggered to conduct regardless of the AC voltage phase; common method is phase-shift triggering, i.e., changing the output percentage by altering the conduction angle (phase angle) of the sinusoidal AC voltage.

Conrad Electronic 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. Based on principle, they are divided into synchronous generators, asynchronous generators, single-phase generators, and three-phase generators. Based on generation method, they are divided into steam turbine generators, hydroelectric generators, diesel generators, gasoline generators, etc. Based on energy source, they are divided into thermal power generators, hydropower generators, etc.

Conrad Electronic 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 stands for negative; N-type semiconductors are formed by adding phosphorus to high-purity silicon to replace some silicon atoms, generating free electrons for conduction under voltage stimulation, while P stands for positive, meaning 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 8 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 a few 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 in the emitter region (electrons) and the majority carriers in the base region (holes) easily diffuse across the emitter junction toward each other. However, since the former's concentration is significantly higher than the latter's, the current through the emitter junction is basically an electron flow, known as the emitter electron current.

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