[Timer] Very simple RedPower2 reactor timer for beginners

> Timer facing east
^ Timer facing north
# Toggle latch with the torches facing north/south
+ Wire
R Reactor (or reactor chamber)




  R
  +
 ++
 >#+
  +^




Set > to the operational time and ^ to the cooldown time.
While > is spinning, the wire going to the reactor should be off, and vice-versa - if not, right-click the toggle latch to invert.