This TTL counter was found in the March 1991 issue of Radio Electronics magazine. The circuit is part of a larger project and must be powered by a 5V voltage.
This circuit is from an English magazine of 1977. The circuit is still current, just using BC547...
This circuit was obtained in an old Elektor. It is a reference, since the integrated products of the...
This circuit was found in a European technical documentation from 1991. It is a circuit that must...