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.
Found in a 1966’s General Electric documentation, this circuit uses a triple diode from the time....
We found this circuit in the Linear Technology Applications of 1997. The circuit uses components of the...
This circuit was found in an old Hewlett Packard publication. Its purpose is to activate neon...