This circuit can keep a set of lamps on for up to 1 minute, time given by C2 and R2 that can be changed. The load depends on the relay. The circuit is old, from 1988 documentation, but totally viable today.
This filters blocks radio interference or noise coming from the AC Power line. Noise such as the...
Found in a 90s Popular Electronics, this circuit triggers a relay in case of overvoltage. Can be used as a...
We found this sophisticated home alarm in a 1994 documentation. The circuit supports sensors of...