This circuit, suggested by an Electronics World of 1969, keeps a blinking LED for a while when a power outage occurs. Time depends on capacitor C1.
This circuit was found in an old British publication from 1976. It must be powered with 5 V and...
We found this circuit in a 1979 documentation, but it can be changed to use more modern...
The integrated circuit used in this application is uncommon, but equivalent operational ones can...