How to judge the three pins of the stamping triode

The full name of the stamping part transistor should be a semiconductor transistor, also called a bipolar transistor, a transistor, which is a semiconductor device that controls current. Its function is to amplify weak signals into electrical signals with larger amplitudes, and also be used as non-contacts. switch. How to judge the three pins of a stamping part transistor: first measure the potential of each pin, where the potential difference between the two pins is 0.2-0.7, and the third pin has the lowest potential, then the tube is a PNP tube, and the potential is from low to low The high arrangement is the collector, the base, and the emitter. The stamping triode is made of two PN junctions very close to each other on a semiconductor substrate. The two PN junctions divide the entire semiconductor into three parts. The middle part is the base area, and the two sides are the emitter and collector areas. The arrangement is There are two kinds of PNP and NPN.