This simple digital circuit tester can work with TTL technology when powered by 5 V and with CMOS when powered by voltages from 3 to 15 V. The circuit provides LED indications and uses current ICs.
For analog lines, this circuit was found in the August 1994 issue of Electronics Now magazine. The...
This circuit has a traditional configuration often found on this site. The transistor must be...
This 4-digit counter, using CMOS technology, was found in a 1997 documentation. The circuit is...