According to the different positive and negative resistance values of the PN junction in junction field-effect transistors A multimeter can be used to distinguish the three electrodes of a junction field-effect transistor.
The working principle and characteristics of a transistor are essential knowledge that electronic technicians must master. There are three commonly used working states for a transistor: cutoff, amplification, and saturation, each with different conditions and characteristics. In fact, there is a fourth working state of the transistor in the circuit, although this state is not commonly used, it is also something we must understand.
Firstly, connect the multimeter to the test diode terminal, use the red probe of the multimeter to touch one of the pins of the transistor, and use the other probe of the multimeter to test the remaining pins.
There are two types of transistor based on their materials: germanium transistor and silicon transistor.
The transistor and field-effect transistor in digital electronic products are generally black, with most having three pins and a few having four pins (two pins in the transistor are connected, usually the emitter E or source S).
Fast Recovery Diode (FRD) is a semiconductor diode with good switching characteristics and short reverse recovery time. It is mainly used in electronic circuits such as switching power supplies, PWM pulse width modulators, and frequency converters, as a high-frequency rectifier diode, freewheeling diode, or damping diode.
