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 documentation from the 1980s, this circuit can be used with other operational ones. The...
This circuit is from an old publication from 1977 and can be implemented with more modern...
This control for a small servomotor with a current of a few hundred milliamps was found in an...