This circuit with germanium transistors is from 1960 and was found in Mullard's transistor application manual from 1960. The circuit can be adapted to use more modern transistors.
This 1986 documentation circuit provides 3, 4, 5, 6 V voltages under 350 mA for powering walkmans...
Rectangular signals up to a few hundred kilohertz can be generated with this circuit, which is...
This sophisticated circuit of the coin-toss game was found in an American 1980s documentation. The circuit...