We will find that field effect tubes are often used in the design of switching power supplies. Their appearance is somewhat similar to triodes, but they still need to be installed on a radiator. After all, the passing current is relatively large, so this heat dissipation must be done well. Although the construction principle is relatively abstract, it can be generally seen that the use of different field effect tubes in the process of electrical control switching is still different.

Field effect transistors are commonly used in power switching circuits, especially the turn-on and cut-off of this high-level and low-level bit can realize the switching of the power supply. Then it can be seen in the battery conversion circuit that this level inconsistency can also be converted, because a conversion of high level and low level on the signal line corresponds to turn-on and cut-off. The input impedance in the amplifier circuit is still very high, so the coupling capacitor capacity is not too large, and there is no need to use electrolytic capacitors. As a feature of relatively high input impedance, it can usually be used in multi-stage amplifier circuits and becomes the choice for impedance transformation. Since the voltage is convertible, it can also be used as a variable resistor, and can even be used as an electronic switch in some places.
Field effect transistors are widely used in integrated circuits due to their input resistance and low noise and very stable conductivity. However, if you want to use them correctly, you must clearly identify its pins and their functions. The management is the same as that of triodes. You must determine which of these three pins has what function. Usually when you want to judge, you have to use the resistance to understand, because some have the same resistance, and some have similar resistance, you can judge each other's pins, because the different resistance of the pins can be more easily detected. To judge whether it is good or bad, you must first take a look at the appearance. If there is no obvious damage, you need to use a resistance meter to measure it. By measuring it, you can know whether it is a breakdown or an open circuit, both of which can be detected.

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