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Recognition and Measurement of Electronic Components

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This video mainly explains capacitor identification

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A capacitor is a component that holds an electric charge

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Capacitors have the function of charging and discharging

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For example, when repairing large household appliances,

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the capacitors will be discharged before repairing the mainboard

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some use light bulbs when they discharge

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Connect two wires to the light bulb, connect them to the positive

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and negative poles of the capacitor,

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then the light bulb will light up

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This is to discharge the capacitor on the mainboard

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According to the packaging method of capacitors,

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it can be divided into chip capacitors and plug-in capacitors

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Plug-in capacitors generally have pins, and chip capacitors have no pins

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According to the polarity,

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it is divided into polar capacitors and nonpolar capacitors

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A polar capacitor, one end of its pin has a white or dark mark,

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and the color of both ends of the nonpolar capacitor is the same

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Polar capacitors and nonpolar capacitors are drawn differently in the circuit diagram

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For example, capacitor C2407 is a polar capacitor

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It draws a straight line on the positive pole and a curved line on the negative pole

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A nonpolar capacitor will draw two parallel lines

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In mobile phone mainboards, most of the chip nonpolar capacitors are used

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The role of capacitor

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Capacitors have the basic characteristics of passing AC, blocking DC,

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passing high frequency, and blocking low frequency

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It is mainly used for filtering, coupling,

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resonance and other functions

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Capacitor code

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A single capacitor is represented by the letter C in the circuit diagram,

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such as C2732

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Capacitors in parallel will be represented by the letter CN

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Capacitors in parallel means that multiple capacitors are arranged side by side and packaged together

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For example, in the picture, the capacitor has multiple pins,

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which belongs to the capacitors in parallel

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In mobile phone mainboards, most use a single capacitor

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The capacitors are mostly brown or beige

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For example, in the picture, brown or beige are capacitors

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If the capacitor cannot be identified by color,

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identify it according to the number of the capacitor

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The unit of capacitor is farad, represented by the letter F

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Farad is a relatively large unit

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In mobile phones, microfarad capacitors and picofarad capacitors are used more

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The conversion relationship of capacitors is

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1F=1000mF

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1mF=1000uF

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1uF=1000nF

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1nF=1000pF

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For example, capacitor C2732 is a capacitor of 22 microfarads

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Ok, that's all for this video