This circuit has a high input impedance and low output impedance, serving as an adapter for microphones. The circuit is powered by a single battery and the FET admits equivalent as the BF245. The circuit is from an old American publication.

This circuit has a high input impedance and low output impedance, serving as an adapter for microphones. The circuit is powered by a single battery and the FET admits equivalent as the BF245. The circuit is from an old American publication.