This circuit makes use of a specific 80's component and was found in an American manual of the time. A matrix keyboard allows you to select one of several music programs.
The S-meter is signal strength meter, coupled to telecommunications receivers to indicate the...
We found this circuit in English documentation for PCs from 1996. The ZN448 is a very uncommon...
This bargraph circuit has already been explored in other versions in articles on this site. This is...