This is a very common circuit in the days of xenon flashes for cameras. This is from a Radio Electronics magazine from November 1965. It uses an SCR and has manual triggering.
Found in a Popular Electronics from the 80's, this circuit simulates the equivalent card game. The...
This simple circuit helps to save incandescent lamps by leaving their filament slightly heated and thus...
This circuit was found in a Radio Electronics Constructor, English magazine of April 1976; The...