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.
We found this circuit in an old Argentine publication. The transistor can be replaced by a more...
This power supply uses a single-winding transformer. We found it in July 1984 Radio Electronics magazine....
This simple rhythmic light for incandescent lamps was found in old English documentation....