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.
This circuit was obtained from a manual of the integrated circuit itself, but can be applied to...
This circuit was found in an old publication about transistors. The circuit can be used to drive...
This circuit simulates a unijunction transistor trigger with two bipolar transistors. The circuit...