This TTL counter was found in the April 1979 issue of Radio Electronics magazine. The circuit is powered by 5 V and has a pulse generator for educational or experimental purposes.
This circuit allows you to use a calculator as a timer by directly activating a sum key with...
This “Half adder” circuit uses NAND gates from a 7400. The power supply must be 5 V. ...
ECL logic circuits can operate at very high frequencies. This circuit was obtained from a 1977...