This circuit, found in 2002 documentation, triggers LEDs when a phone call is received. The LEDs will flash alternately in these conditions. Common LEDs are used in this circuit.
This switched stepdown regulator was found in a 60s documentation. It makes use of unusual...
This circuit uses three flip-flops and two NAND ports to obtain a frequency division by 5,...
Found in an article in the August 1971 Radio Electronics magazine, this circuit supports sensitive...