This circuit provides 2.5 W of power with 6 V supply and 4-ohm speaker. We found it in the Radio Electronics magazine of April 1990.
This circuit is from a Popular Electronics from April 1991. The magazine no longer exists, but the...
The circuit is from an 80's publication, but the components are current, only special type diodes...
The galena XTAL is replaced by a germanium diode in this Project. Diodes such as the 1N60 or 1N34...