We found this circuit in an American publication from 1977. The circuit drives two LEDs according to the control of the inputs. The technology is TTL requiring 5 V to power supply.
This logic tester circuit was published in the November 1980 issue of Radio Electronics magazine. The...
We found this circuit in a 1975 publication. The circuit can be made with more modern equivalent...
This circuit is from the 1990 Motorola Linear Databook. The circuit can be implemented with other...