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 1968 circuit uses Motorola power transistors of the time, providing 20 W of power with...
This precision circuit can provide timings from 0.2 milliseconds to 3 minutes accurately. The...
This circuit, suggested by Texas Instruments, is based on the integrated TL497A, designed for...