All items tagged with main and alarm (3)

1-07-2004 | This circuit was designed to produce an audible alarm when the mains power is interrupted. Such an alarm is essential for anyone whose livel...

1-07-1987 | by A Treps This circuit was originally developed to detect and signal interruptions of the mains supply to artificial respiration systems. T...

1-09-1983 | alarm extension ... The garden party is in full swing .. . Amidst all the happy noises and chatter it is difficult to hear when the telephon...