Product application knowledge

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  How to choose resistors in circuit design?

  Resistors are one of the commonly used components in electronic products, and basically any electronic product will have resistors inside. Resistors can be used as voltage dividers, splitters, and load resistors in circuits; It can form filters and delay circuits together with capacitors; Used as a sampling resistor in power or control circuits; Used as a bias resistor in semiconductor tube circuits to determine the operating point; Using resistors with special properties such as varistors and thermistors to prevent surge voltage, suppress surge current, and achieve over temperature prot...

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  Qualitatively judge the quality of field-effect transistors and transistors

  First, use the multimeter R × 10k Ω (with a built-in 15V battery), connect the negative probe (black) to the gate (G), and the positive probe (red) to the source (S). Charging between the gate and source causes a slight deviation in the multimeter pointer. Switch to the R × 1 Ω range of the multimeter again, connect the negative probe to the drain (D) and the positive probe to the source (S). If the multimeter reading is a few ohms, it indicates that the field-effect transistor is good....

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  Knowledge of lightning protection and protective devices

  The installation locations of different levels of lightning arresters in the interval are different. B-level, C-level, and D-level can withstand direct lightning strikes without attenuation. Zone 0A may be affected by direct lightning strikes without attenuation. Zone 0B will not be affected by direct lightning strikes. Surge lightning arresters in Zone 1 will not be affected by direct lightning strikes at the junction between Zone 0 and Zone 1, and at the junction between Zone 2 and other important equipment in Zone 1 will not be further attenuated by direct lightning strikes....

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  Overview of the working principle of diodes

  A crystal diode is a p-n junction formed by a p-type semiconductor and an n-type semiconductor, with space charge layers formed on both sides of its interface and a self built electric field established. When there is no external voltage, the diffusion current caused by the difference in carrier concentration on both sides of the p-n junction and the drift current caused by the self built electric field are equal and in an electric equilibrium state....

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  What is a voltage regulator diode and how to identify it?

  Zener diode, also known as Zener diode in English. This diode is a semiconductor device that has high resistance until the critical reverse breakdown voltage.

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  PPTC advantages of overcurrent protection devices

  There are various methods for overcurrent protection in circuits, including commonly used thyristor based circuit protection, transistor based circuit protection, relay based circuit protection, disposable fuses, bimetallic temperature control circuits, and dedicated integrated circuit protectors.

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