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All the testing methods below uses a multimeter and hence its How to test FET’s especially the JFET and MOSFET using a multimeter. How to test an FET ? FETs are checked by measuring different resistances by a multimeter. When resistance is checked between source and drain, it should be of the order of 10 kohms. How to test a JFET ? When a JFET is checked as a diode (gate-to-channel junction) multimeter should indicate low resistance between gate and source with one polarity and very high resistance between gate and source with meter polarity reversed. Troubleshooting a JFET test…

This article discusses various circuits that can be used to test a Transistor, both NPN and PNP. We have structured this article into two circuits. If you have any doubts about any section please ask through comments. 1. Transistor Tester built using Transistors 2. Simple Transistor Tester (Contains both Circuit Diagram and PCB Lay Out) 3. LED Based Transistor Test 1. Transistor Test Circuit Description. Here is a very simple circuit that can be used to check the hfe of transistors. Both PNP and NPN transistors can be checked using this circuit. Hfe as high as 1000 can be measured…