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Recognition and Measurement of Electronic Components

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This video mainly explains common inductor types and inductor parameter identification in mobile phones

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In real objects, large inductor will be marked with dot

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Like these inductors, they all have parameters

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For example, inductor L3401,

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the position of the circle marked with the first corner of the inductor represents the direction of the inductor

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It corresponds to the mark in the real object

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Parameters are marked below the position number

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0.22 uH means the inductance is 0.22 microhenries,

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20% means the error of the inductance

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5.8A means that the maximum passing current of the inductor is 5.8A,

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and 0.04OHM means the resistance value of the inductor

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Common inductors in mobile phones

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One is a large chip inductor, the color of the inductor is mostly gray,

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and there will be a dot mark

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The second type is the fuse inductor,

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the fuse inductor is relatively small,

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generally located near the connection seat

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Let's understand the inductor through the physical map,

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bitmap and schematic diagram

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In the physical picture, the large inductor is easier to distinguish

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Large inductors generally have a gray surface and are marked with dots

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The fuse inductor is generally near the connection seat,

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because it is relatively small,

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it cannot be distinguished by physical inspection

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We can view it through the bitmap

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The mark FL means it is a fuse inductor, such as FL10500

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After we can find the inductor in the bitmap, switch to the schematic diagram,

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we can see the parameters of the inductor

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The small circle represents the direction of the inductor,

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2.2 uH represents the inductance, and 20% represents the inductance error

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3.7A represents the maximum passing current of the inductor,

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and 0.071OHM represents the resistance of the inductor

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FL10500 is a fuse inductor with a resistance of 33 ohms,

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an error of 25%, and a maximum current of 1.5 amps

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In the main board, there are some double inductors connected together, such as L3301

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In the schematic diagram, we can see that pins 1 and 3 of the inductor are an inductor,

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and pins 2 and 4 are an inductor

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This is an inductor in which two inductors are packaged together

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When we replace this kind of inductor after it is damaged,

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we need to find the same type of inductor to replace it,

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and we cannot use a single inductor to replace it

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Ok, that's it for this lesson