In recent years, in electronic circuitsfield effect transistorThe application is becoming more and more widespread. It has the characteristics of high input impedance, large dynamic range, and low power consumption. Today we will learn what isfield effect transistor？

field effect transistorCan be divided into knot typesfield effect transistorand insulated gate typefield effect transistor, are divided into N-channel and P-channel types. So how to specifically identifyfield effect transistorWoolen cloth?

one,field effect transistoridentification skills

1.field effect transistorThe appearance and graphic symbols of

commonfield effect transistorThere are also 3 pins, namely gate G, drain D, and source S.

2.field effect transistormain parameters

field effect transistorThe parameters include DC parameters, AC parameters and limit parameters. The main parameters include drain-source saturation current, pinch-off voltage or turn-on voltage, transconductance drain-source breakdown voltage, maximum power dissipation, and maximum drain-source current.

two,field effect transistorDetection skills

ordinaryfield effect transistorThe forward and reverse resistances between the three pins are infinite. If there is one-way conduction between the source and base electrodes, it indicates that there is damping in the connection between the source and drain electrodes.diode. If there are two or more small resistance values ​​in the forward and reverse resistance values ​​measured between the three pins, it meansfield effect transistorThere is a breakdown phenomenon.

1. .将field effect transistorThe front is facing you, the pins are downward, from left to right are the barrel pole G, pole D, and source pole S.

2. Short circuit firstfield effect transistor3 pins to release the residual charge on the gate

3. Then place the digital multimeter ondiodeBlock, measure the forward and reverse resistance between the drain D and the source S, they are infinity and about 520 ohms respectively, indicating that there is damping in series between the drain and the source.diode。

4. 4. Then switch the multimeter to 200M and let the red test lead connectfield effect transistorThe grid, the black test lead is connected to the source, and the battery in the multimeter is used to provide voltage to the gate and source.

5. Switch the multimeter back todiodeBlock, and then measure the forward and reverse resistance of the drain and source, both are about two hundred ohms, indicatingfield effect transistornormal.

three,field effect transistorreplacement tips

field effect transistorWhen replacing, it is necessary to ensure that all parameters of the new parts meet or exceed the standards of the original components and that the category and polarity are the same.

Dear friends, do you understand all the knowledge points I summarized above?

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