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 a 1998 documentation. The circuit can be made with 12 V, 6 V or even 5 V...
Avago Technologies (www.avago.com) suggests the circuit in Figure 9 for amplifying signals of...
This circuit was found in the April 1970 Radio Electronics magazine. The dual function circuit uses 4...