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 found in a 1975 technical publication. The circuit can be designed with 741...
This circuit was found in a Popular Electronics of the 90s. It operates a third brake light that...
In the figure we have a different configuration for an oscillator with the 555. This circuit was...