So I was showing off my grand sand-trap to a friend today - hmm. Before I say what happened, I should probably go over what was supposed to happen.

In a subterranean complex, I built a large domed room with the floor open to the Void. I then went around the perimeter of the room, placing pistons on one long circuit, with Repeaters used as the only direct redstone contact for each and every piston, and occasionally using a Repeater-and-wire loop on the outside of the circuit to extend the energy flow. At the beginning of the circuit, near the switch, is a piston-based door that's closed when the circuit is on, and open when it isn't.

On each of the perimeter pistons, I placed a block of stone and a torch, and then proceeded to build a sand-dome held up by the torches. The plan was for the dome to collapse when the switch was flipped to open the door, barring the way to incautious adventurers.

Instead, precisely nothing happened. The input stopped mattering, because the circuit stayed on even when it was off.

Advice for how to fix this circuitry error would be much appreciated.

UPDATE: Problem fixed via good-old double-inverters, and basically switching things around to get my circuit to bear less resemblance to a waffle. I still am not sure whether the monstrosity I originally created was a true Illogic Circuit or merely an astronomically slow Clock Circuit.