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 generates high voltage pulses, which can reach 30 000 V with the discharge of a...
The LED blinks increase in speed with voltage. The circuit is from National Semiconductor's Linear...
Using two common operationals, such as 741, this circuit serves as a medium control in an...