This circuit was found in a 1964 Electronic Design. The circuit makes use of transistors of the time. Current equivalent transistors may be experienced.
This circuit was obtained from a Radio Electronics issue from January 1989. The indicator is a...
We found this circuit in an English publication of 1976. It can be easily assembled by changing the...
This audio circuit has an output power of 1 W. We found it in the Radio Electronics magazine of...