This 10-minute timer was found in the July 1994 Radio Electronics magazine. The relay must be sensitive to the supply voltage used. The capacitors determine time ranges.
This circuit uses a General Electric coupler from the time of the publication in the 1980s....
Found in a 1980s documentation, this circuit makes use of components from that time. Modern...
Found in Linear Technology documentation from the 1980s, this circuit has an accuracy of 0.01%....