This circuit has a sensitivity of 2uW. We found it in documentation from the 1980s. The integrated circuit is from that time. Equivalents can be tried.
This circuit was obtained in an old American publication from 1974. The supply must be made with 5 V...
Currents of a few milliamps are enough to drive loads up to 500 mA with this circuit. The...
Published with a power amplifier in the January 1985 issue of Radio Electronics, this circuit...