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Hello everyone, in this lesson we will learn the circuit symbol of the triode and the code name of the triode

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The circuit symbol of the triode can be divided into two types according to the type of the triode

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For example, on the left, this is the circuit symbol of the NPN transistor

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On the right is the circuit symbol of the PNP transistor

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The difference between these two circuit symbols is that

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the direction of the arrows between the BE poles is different

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When we memorize the circuit symbol of the triode,

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we can add a vertical bar to the small arrow between BE

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Then BE becomes a circuit symbol of a diode

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In the left picture, the B pole is connected to the anode of the diode, which is the P area

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The E pole is connected to the cathode of the diode, which is the N area.

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Then the symbol of this circuit diagram is the circuit symbol of the NPN transistor

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On the right, the B pole is connected to the cathode of the diode, which is the N area

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The E pole is connected to the positive pole of the diode, which is the P area.

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Then this is the circuit symbol of the PNP transistor

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After understanding the circuit diagram symbols of the triode,

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let's look at the code of the triode

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The code name of the triode is represented by the letter Q, no matter what type

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As shown in the figure, Q508 and Q27, they are the code names of triodes

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At the same time, we need to pay attention that Q is not only used to represent the triode,

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but the MOS tube we will learn later is also represented by Q