Using the 555 and 4020, this timer was found in the July 1994 Radio Electronics magazine. The relay is voltage-dependent, and the transistor is general purpose.
Today we have more compact solutions. This is from a Radio Electronics magazine from October 1990....
This circuit is from an 80's documentation, making use of PUTs that are not currently common...
This circuit multiplies the input voltage by 3 and can work with up to 12 V input. The current is a few...