Discrimination of the base of a triode

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Discrimination of the base of a triode

Discriminating the base of the triode: According to the schematic diagram of the triode, we know that the base of the triode is the common pole of the two PN junctions in the triode. Therefore, when judging the base of the triode, we only need to find the common poles of the two PN junctions. It is the base of the triode. The specific method is to adjust the multi-meter to the R × 1k block of the electric block. First, put the red pen on one foot of the triode, and use the black pen to touch the other two legs of the triode. If it is all-pass, the red pen The foot that is placed is the base of the triode. If it is not found at one time, the red test pen is changed to the other leg of the triode, and then measured twice; if it is not found, the red test pen is changed again, and then measured twice. If you haven't found it yet, use the black test pen on one foot of the triode. Use the red test pen to measure twice to see if it is all-pass. If it is not successful, change it again. This can be found up to 12 times and the base can always be found.

Discriminating the type of triode: There are only two types of triodes, PNP and NPN. When judging, it is only necessary to know that the base is a P-type material or an N-type material. When using a multimeter with R×1k, the black test pen represents the positive pole of the power supply. If the black test lead is connected to the base, the base of the triode is extremely P-type material, and the triode is of the NPN type. If the red test lead is connected to the base, it means that the triode base is extremely N-type material, and the triode is PNP type.