High Gain JFET Audio Amplifier

This is a simple high gain JFET audio amplifier circuit. This circuit need very low power but it provides high gain amplifying function. It also called “JFET µ amp”. Here is the circuit :

The lower drain current is, the more gain is obtained because µ of a JFET increases as drain current decreases. However it will sacrifice input dynamic range with increasing gain. [Source: National Semiconductor Application Note]