Found elsewhere in this section, but from other sources, this circuit is from a 1964 Electronic Design. The transistor is from the era and the power voltage depends on this component.
This simple circuit was found in the August 1984 issue of Radio Electronics magazine. The circuit...
This simple two-transistor circuit used transistors from the 60s, having been found in a...
This circuit is from an old manual, but can be easily assembled as the integrated one is still...