To identify the quality of a field effect tube, you must first measure it, that is, observe whether the appearance is normal. When some problems occur, the appearance has been damaged, and it can be determined to be bad. However, some appearance is very good. Then at this time, take a look at the place welded to the circuit board to see if any pins are broken or burned. During the inspection, clean the pins, discharge the field effect tube, and then conduct the inspection.

There are two types of field effect transistors, one is junction type and the other is metal oxide. The corresponding main function is that the input resistance of voltage-controlled semiconductor devices is relatively high, the noise is small, and it is not easy to be broken down during integration, so the use area is still relatively good. In the amplifier circuit, the input impedance of the field effect transistor is very high, so a relatively small-capacity coupling capacitor can be used instead of an electrolytic capacitor. In addition, this high impedance feature can be suitable for impedance transformation in the amplifier circuit. The function and input effect are still very good. We all know that this kind of resistance is relatively large. It can also be used as a variable resistor and a constant current source. It can be used in the amplifier circuit and can also be used as an electronic switch. It is really very useful.
As a type of electronic component, the field effect tube is just a general term for an element. Because it is divided into two types, it focuses on transistors and can use the control input loop to control the current. Therefore, this feature is relatively large. In the aspect of strong radiation resistance, it can reduce noise in electronic circuits, and In the amplifier circuit, the amplifier circuit composed of triodes has a certain influence, so this kind of use is still very common. However, the devices used as control bits are actually similar. In addition, this field effect transistor is not a component, but a device. In some cases, it can even replace the thyristor.
Through the above understanding, we can also see that the function of such components is very obvious. When judging whether it is good or bad, we can know through measurement what the quality is through impromptu understanding.

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