This is a typical 3 ½ digit TTL counter. We found it in the September 1973 issue of Radio Electronics magazine. The circuit is to be powered by 5 V. It can be expanded to more digits.
This circuit was found in a 1966’s American publication. What it does is to receive a pulse and...
The idea of this circuit is a resistance meter or continuity test with a common microammeter or...
Modern operations can be used in this circuit that multiplies a capacitance of 10,000 uF for a...