This circuit is an improved version of the previous ones with the LM3914. We found it in the March 1992 issue of Radio Electronics magazine.
A tap on sensor X1 of the circuit shown in the figure causes the flip-flop formed by the 4 NAND...
Suggested by General Electric in 1967 this circuit generates a single pulse when receiving a light signal...
This 2 Hz relaxation oscillator was found in a 1970 EEE. The circuit uses transistors from the era...