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Recognition and Measurement of Electronic Components

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This video mainly explains the knowledge of diodes

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Diodes are electronic components made of semiconductor materials

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and are the world's first semiconductor components

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Materials for making diodes include silicon materials,

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selenium materials, germanium materials, etc.

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Diodes made of different materials have different characteristics and working conditions

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According to the applications, diodes can be divided into light-emitting diodes,

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Zener diodes, rectifier diodes and anti-static diodes

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Like traffic lights in daily life, billboards are all light-emitting diodes

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In addition to light-emitting diodes, there are some other forms of diodes

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For example, in picture 2,

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this is a high-power diode

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In Figure 3, this is a fast recovery diode

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Both of these diodes are used in circuits with relatively high power

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Like switching power supply, mobile phone charger, etc.,

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they will use internally

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Small diodes are used in mobile phones

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For example in Figure 4,

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which is zoomed in, it's actually very small

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Diodes have two polarities, P pole and N pole,

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P pole is also called positive pole, and N pole is also called negative pole

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In the actual product, the marked end is the negative pole,

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and the unmarked end is the positive pole

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For example, in Figure 2,

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the white circle represents the negative pole of the diode,

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and the other end is the positive pole

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In Figure 4, the end with the silk screen represents the negative pole,

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and the other end is the positive pole

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In the schematic diagram, diodes are identified with a triangle symbol and a vertical line

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The wide end of the triangle symbol represents the positive pole of the diode,

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and the pointed end of the triangle symbol represents the negative pole

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In Apple's drawings, the one marked with A represents the positive pole,

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and the one marked with K represents the negative pole

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In other schematic diagrams, the wide end represents the positive pole,

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and the pointed end represents the negative pole

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These two circuit diagram identifications belong to the ordinary diodes

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Both Figure 2 and Figure 4 belong to the anti-static diodes

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Ok, that's all for this video