This circuit, with printed circuit board, is from an article in Radio Electronics magazine from May 1971. The circuit uses the C106 which was already a common component at the time.
This 1960s Japanese commercial AM radio uses 6 germanium transistors and is powered by 4...
This well-designed bistable circuit was found in a 1970s documentation. Transistors can be current...
This microamplifier was found in a Popular Electronics from June 1968. It is an experimental...