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 somewhat complex circuit was found in the May 1984 issue of Radio Electronics magazine. The...
This circuit was obtained from the Encyclopedia of Electronic Circuits volume 5 of 1995. The...
This transmitter was sent by contributing reader Adriano Muniz Moura from Pirapora – MG. It is in...