This circuit was obtained in a 1980s publication, but it can be easily assembled today, as all components are common. The transformer is 12 + 12 V with at least 1 A and the diodes 1N4002.
Found in a 1967 manual, this circuit uses transistors from the era to generate a linear ramp...
This traditional crystal radio circuit, but which has a modern version with diode, was found in an...
This frequency modulated light transmitter is from a 1990s documentation. The circuit may use...