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 is one of the many possible siren configurations for the 555 integrated circuit. We found it in...
This timer has a divider programmed by BCD switches. The circuit is from a Radio Electronics...
Passaje Alarm This locking circuit was found in a 1988 publication. It locks a relay when the...