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 protection circuit applies to booster steps for the 78xx series integrated units where xx is...
We found this circuit in a 1980s Motorola documentation. The circuit makes use of common operating...
This circuit is from European 90s documentation. The integrated circuit used is not very common...