This benchtop power supply with various output voltages from 1.5 to 12 V was found in Radio Electronics magazine from August 1960. The circuit uses power transistors of the time.
This traditional doubler configuration with the 555 IC can be found in other articles on the...
This traditional circuit with a neon lamp is a flip-flop that draws which of the two lamps will...
This sophisticated circuit is from old Motorola documentation, using common integrated devices...