What is a JFET?

Example of an N-Channel JFET
Example of an N-Channel JFET

JFET stands for junction-gate field-effect transistor. Formerly, when one simply said "FET," one meant a JFET. Key features of JFETs include a large input impedance and low noise, making them suitable for impedance conversion and low-noise amplifier applications.
A JFET can also be used as a simple constant-current source.

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