Transistor checker

Allen Pitts's picture


Joined: Sep 25, 2021

Replies: 3
Transistor checker
November 28, 2021 - 3:44am

Hello Circuit Digest forum.


Have been studying the transistor checker circuit at

Will this checker work on FET transistors?


Allen in Dallas



Ashutosh's picture


Joined: Aug 27, 2018

Replies: 25

The circuit basically uses a 555 timer to trigger the transistor and monitor the output. So I dont see why it cant be used for FET, it should work give it a try. you have too just replace the BJT in FET in following fashion 

Base - Gate

Collector - Drain 

Emitter - Source