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.
We found this circuit in an American documentation from 1964, but it can be easily assembled...
Indicated to be used as a clock, this circuit was found in old documentation. The operational of...
This circuit was obtained in a 1990 English magazine. The circuit can be assembled with equivalent power...