This latched alarm uses a double relay for this purpose and can control higher power external loads like a siren. The circuit is from 1974 documentation and has a very low consumption.
The purpose of this circuit is to cut the peaks of a sinusoidal signal so that it is close to a...
This automation circuit was found in Radio Electronics magazine from October 1961. The voltage of the...
This circuit produces an intermittent ring tone being triggered directly by the telephone line. However,...