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My first successful mob spawner (4 tries total, not counting renovations) is a fall trap spawner. 3 levels, all the same. Each level is a 20 x 20 room with 8 x 8 spawn pads in each corner (4) and 2 rows of water seperating each pad (4 again) pushing the mobs to their death! I get around 400 items an hour, the most i have ever had! But it has moments where nothing is happening. So now i am trying to put in a mob flush system. I want it to kick in every 20 secs. What i am planing on doing is having the back of each pad lined with sticky pistons and a row of water behind em. So this way they release 2 rows of water onto each pad.

Now my problem! I have 50 repeaters set on 4 clicks that are fed by a torch. The repeaters feed into a pulse limiter made with a sticky piston. You can find the schematic in the wiki for it. And then they give power to my torch/block tower to my water/sticky pistons. From the base of the tower again the power continues around to a block with a torch on the side to invert the power so the main torch at the begining flip flops. For the most part it works but eventually my inverter dies and i have to reset it!

Any ideas on a better way to do this? I want to make my mob spawner as effecient as possible! My mob spawners base starts at 25 blocks high and my structures are all well lit! I am assuming most of the caverns are too!

Thanks that was very informative! But i fount a better system for the clock. But now i cant get the water to flow over the whole pad and flow down to the next level. Willi have to add a flooding system for each floor seperately or is there a way i might be able to get water to flow down to each floor and flood it?