This 4-tube amplifier with 6W of output was found in an American manual from 1947. The sound quality is excellent.
This circuit was obtained in a 1988 publication, but it can be assembled very easily today, as all...
This simple LED effect is from a 1988 documentation, but it can be easily assembled today, despite...
This car alternator voltage regulator was found in a former General Electric publication. It maintains...