Type of Transistor

According to polarity, there are two types: one is NPN type triode, which is the most commonly used type, and the other is PNP type triode. There are two types of materials: one is silicon triode, the most commonly used type, and the other is germanium triode, which was previously used more frequently. The triode is divided into two types according to its operating frequency: one is a low-frequency triode, which is mainly used in places where the operating frequency is relatively low; The other is a high-frequency triode, mainly used in places with relatively high operating frequencies. According to power, there are three types: one is a low-power transistor, which has a smaller output power; One is a medium power transistor, which has a higher output power; The other is a high-power transistor, which can have a large output power and is mainly used in high-power output situations. Classified by purpose: amplification tube and switching transistor