jacob electrical components Germany jacob model jacob price

jacob electrical component is a resistive device with nonlinear voltage-current characteristics, mainly used for voltage clamping when the circuit is subjected to overvoltage, absorbing excess current to protect sensitive devices. The resistor body material of a varistor is a semiconductor, so it is a type of semiconductor resistor. The widely used "zinc oxide" varistor has a main body composed of divalent element zinc and hexavalent element oxygen. Therefore, from a material perspective, zinc oxide varistors are a type of "II-VI group oxide semiconductor". In Taiwan, China, varistors are called "surge absorbers", and are sometimes also referred to as "electric shock (surge) suppressors (absorbers)". A varistor is a voltage-limiting protection device. Utilizing the nonlinear characteristics of the varistor, when an overvoltage appears between the two poles of the varistor, the varistor can clamp the voltage to a relatively fixed value, thereby protecting the downstream circuit. The main parameters of a varistor include: varistor voltage, current handling capacity, junction capacitance, response time, etc. The response time of a varistor is in the ns range, faster than gas discharge tubes, but slightly slower than TVS tubes. Generally, its response speed meets the requirements for overvoltage protection in electronic circuits. The junction capacitance of a varistor is generally in the range of hundreds to thousands of Pf. In many cases, it is not suitable for direct application in the protection of high-frequency signal lines. When applied in AC circuit protection, its larger junction capacitance will increase leakage current, which needs to be fully considered in the design of protection circuits. The current handling capacity of a varistor is large, but smaller than that of gas discharge tubes. Varistors are abbreviated as VDR, and are voltage-sensitive nonlinear overvoltage protection semiconductor components.

jacob electrical component classification

1. Classification by relay external dimensions: ① miniature relay, ② ultra-miniature relay, ③ small miniature relay. 2. Classification by relay load: ① micro-power relay, ② low-power relay, ③ medium-power relay, ④ high-power relay. 9. Classification by relay protection features: ① Sealed relay: contacts and coils are sealed inside a cover by welding or other methods, isolated from the surrounding medium, resulting in a low leakage rate. ② Enclosed relay: contacts and coils are protected by a casing (non-sealed). ③ Open relay: relays without a protective cover for contacts and coils. Among the above, electromagnetic relays and reed relays are the most commonly used in electronic fabrication.

jacob electrical component principle

Bipolar junction transistors are divided into two types by material: germanium transistors and silicon transistors. Each type has two structural forms: NPN and PNP. However, the most commonly used are silicon NPN and germanium PNP transistors. (Here, N means 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. P means positive, formed by adding boron to replace silicon, creating a large number of holes to facilitate conduction). Apart from different power supply polarities, their working principles are the same. The following introduces only the current amplification principle of NPN silicon transistors. An NPN transistor consists of 10 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 towards each other. However, since the former concentration is greater than the latter, the current through the emitter junction is basically an electron flow, known as the emitter electron current.

jacob 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. Principally, 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, hydro-turbine generators, diesel generators, gasoline generators, etc. By energy source, they are divided into thermal power generators, hydropower generators, etc.

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