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.
The integrated circuit used is equivalent to the 555 and the transistor can be the BC558. R1 and...
We found this circuit in issue 10 of the Italian magazine Selezione Rádio of 1982. The circuit...
This circuit is from 1997 documentation, a time when the parallel port was the most common means of...