This TTL heads or tails circuit was found in the July 1973 Radio Electronics magazine. The LEDs are types of the time. Note the symbolic representation of this component.
We found this circuit in the March 1994 issue of Electronics Now magazine. The transistor is...
This circuit with two transistors was found in ancient European documentation. Transistors support...
Found in American documentation from the 1980s, this circuit makes use of components of the time,...