This CMOS circuit for LED displays is from a Radio Electronics magazine from February 1989. The circuit has an enable pulse for storing the value shown on the display.
The circuit shown is from an old European publication. In it we have the way to activate a relay...
We found this circuit in a European publication from the 1990s. Transistors are still common types...
This circuit was found in an American documentation and can be added to common amplifiers of any...