This is a battery powered 3W power amplifier using germanium transistors. The circuit is from an English documentation from 1967. The transistors are from the time.
This circuit, suggested by National Semiconductor, provides an output voltage proportional to the...
This circuit was found in December 1983 Radio Electronics magazine. The maximum output current is 1 A...
This circuit was suggested by General Electric in 1969 documentation. It provides a maximum output of...