The timer makes sence.
I was thinking more like a relay, back and forth. This one runs, then triggers that one for a while, then back to/or on to another.
I am not good enough to say off the top of my head if a brain could be re-fitted with more then one time type or section, but that would solve LightSpeeds idea.
I may have to test the relay thing when i get time. Use the timer on each, or else you get a mobius loop going REAL fast [:p]