Minecraft wiki entry for Pulse, associated text: The most trivial way to build a dual edge detector is to OR the outputs of a NOR-gate rising edge detector and a NOR-gate falling edge detector. A useful feature of this approach is that you get the rising- and falling-only pulses for free if you need them. If rsource or space usage is more important than timing, parts of the components of the 2 single edge detectors can be shared (the middle row of the example in the Schematic Gallery: Dual Edge Detector). Again, the blocks above the torches limit the output pulse to 1 tick.