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 receiver powered by the signal captured by the antenna (which must be long) was found in...
This simple window comparator based on the well-known LM339 was found in the June 1998 issue of...
This two-port monostable of the 4001 was suggested by an article in the April 1988 Radio...