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Principle of single-junction transistor (double-base diode)
Source: InternetPublisher:toothache Updated: 2017/05/20
The single-junction transistor is also called a double-base diode. Its symbol and shape are shown in the attached figure.
The method to determine the emitter E of the single-junction transistor is: put the multimeter in the R*100 block or R*1K block, and connect the black test lead to the assumed emitter. , the red test lead is connected to the other two poles. When low resistance occurs twice, the black test lead is connected to the emitter of the single-junction transistor. The method to judge the single-junction transistor B1 and B2 is: put the multimeter in the R*100 block or R*1K block, connect the black test lead to the emitter, and the red test lead to the other two poles respectively. In the two measurements, the one with the larger resistance is the red test lead. The test lead is connected to the B1 pole. It should be noted that the above method of identifying B1 and B2 is not necessarily applicable to all single-junction transistors. Some tubes have a small forward resistance value between E and B1. However, it is not particularly important in actual use to accurately determine which pole is B1 and which pole is B2. Even if B1 and B2 are reversed, the tube will not be damaged and will only affect the amplitude of the output pulse (single-junction transistors are mostly used as pulse generators). When it is found that the output pulse amplitude is too small, just change the originally assumed B1 and B2 Just switch it around.
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