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 is from a 1998 Electronics Now and can be easily assembled since it uses a common...
This circuit triggers three incandescent light bulbs following the audio signal applied to its...
This circuit was obtained in the SGS manual of linear integrated circuits of 1982. The components used...