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 circuit can use both separate LEDs and a common cathode display when one segment indicates...
The circuit shown was found in the National Semiconductor Linear Applications Handbook of 1994. The...
Found elsewhere in this section, but from other sources, this circuit is from Motorola...