The circuit is a timer offering periods of up to 24 hours and beyond.The main difference is that when the time runs out, it energizes the relay and it uses less power while the timer is running.
http://www.zen22142.zen.co.uk/Circuits/Timing/24hour.htm
The Z568M is 4 inches high 100 mmand has a digit height of 2 inches50mm. It is therefore truly a giant amongst nixie tubes, presumably intended for railway clock applications and so on.
http://hanssummers.com/electronics/clocks/nixie/#circuit
This circuit has an adjustable output timer that will re-trigger at regular intervals. The output period can be anything from a fraction of a second to half-an-hour or more - and it can be made to recur at regular intervals of anything from seconds to days and beyond.
http://www.zen22142.zen.co.uk/Circuits/Timing/ivt.htm
http://home.cogeco.ca/~rpaisley4/556Stall.html#PCB
Designed to time a sports event; In this circuit the GREEN output is adjusted to be on for 3 minutes and then the RED output is set for 1 minute in a repeating cycle. Each time the light changes a buzzer will sound for about 2 seconds.
http://home.cogeco.ca/~rpaisley4/xSpecial555.html
Be prepared to do some experimenting to get the results you want. This is especially true of circuits such as the Across Track Infrared Detection circuits and any other circuit that relies on other than direct electronic inputs, such as switches.
http://home.cogeco.ca/~rpaisley4/xCA4060B.html
http://www.discovercircuits.com/PDF-FILES/beectr.pdf
help a beekeeper count the number of bees going into or out of a hive.
http://www.imagineeringezine.com/PDF-FILES/beectr.pdf
This project involves making several modification to an early 1960s era Victoreen CDV700 or CDV600-6B geiger counter.
http://www.solorb.com/elect/geiger/cdv700/index.html
http://www.national.com/pf/LM/LM555.html