This flip-flop controlled by an LDR-type photocell was found in Radio Electroinics magazine from June 1959. Note that it can be powered from the mains and directly controls a sensitive relay.
This electronic roulette circuit with 10 numbers was found in a Popular Electronics from the 80s....
Found in an old Popular Electronics this circuit appears in other variations on this site and in...
This circuit was taken from an article in Electronics Now magazine in February 1995. The power...