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 was obtained in a publication for radio amateurs of the 70s. The PNP output...
This shield circuit was found in an American publication from the 80's. The triac is of low...
I found this circuit in a documentation for radio amateurs from 1975. The FET could be the BF245....