This LM380-based circuit was found in documentation from the 1980s. The components are current, and the transistor may be a general-purpose equivalent. Note the use of a medium impedance speaker.
Another of the many circuits of this type that we have in this section. This one was found in the...
This circuit was obtained in a 1978 magazine but can be easily assembled today with a BC547...
We found this circuit in the January 1992 issue of Radio Electronics magazine. The circuit...