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 circuit is from an American 80's documentation. The integrated circuit is from the time and...
This circuit was found in an English publication from 1989, but it can be easily assembled, as the...
This circuit generates a constant current given by R1. The load is on the high side of the feed...