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 output step with a transistor can be used in experimental radios and intercoms or as a signal...
We found this circuit in the October 1991 issue of Radio Electronics magazine. The circuit uses...
We found this circuit in the June 1984 issue of Radio Electronics magazine. The circuit uses an...