This circuit was found in the January 1980 issue of Radio Electronics magazine. It is a digital slot machine using common logic circuits. It can still be easily assembled today.
This circuit that triggers an SCR was found in volume 5 of the 1995 Encyclopedia of Electronic Circuits....
This 1-transistor oscillator circuit was found in the March 1965 Radio Electronics magazine. The...
Found in a 1964 CQ magazine this circuit consists of an automatic telegraphic key, providing the...