This is the old name given to flip-flops or biestable multivibrators. In fact, this is a 1967 Ferranti circuit, triggered by a light sensor.
This reverb effect was found in the December 1961 Radio Electronics magazine. It makes use of...
Found on Popular Electronics from the 1990s, this oscillator uses a general purpose transistor. The...
This simple 741 circuit was found in the August 1993 Electronics Now magazine. The source must be...