1. Field-effect transistors (FETs) can be used for amplification. Due to the high input impedance of FET amplifiers, the coupling capacitor can be small, eliminating the need for electrolytic capacitors.
2. The high input impedance of FETs makes them ideal for impedance transformation. They are commonly used in the input stage of multi-stage amplifiers for impedance transformation.
3. FETs can be used as variable resistors.
4. FETs can be conveniently used as constant current sources.
5. FETs can be used as electronic switches.
