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.
Found on Popular Electronics this circuit has variations found throughout this site and section....
We found this circuit in a documentation from the 90's. The coil has its characteristics given next...
We found this circuit in a 1993 documentation. It is a high input resistance millivolimeter whose...