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Pulse Circuits

EDGE DETECTOR

Converts a sustained signal into a brief pulse at the moment the signal turns on (rising edge) or off (falling edge). Essential for triggering actions exactly once per state change.

When to Use

One-shot triggers from levers, detecting the exact moment a signal changes, preventing repeated activations.

Materials

  • ▸1 Redstone Repeater
  • ▸Redstone Dust
  • ▸1 Redstone Comparator or Torch

How to Build

  1. 1Rising edge: Split the input into two paths.
  2. 2Delay one path with a repeater (1+ ticks).
  3. 3Feed the delayed path as the side input of a comparator reading the direct path.
  4. 4The comparator outputs only during the brief moment before the delayed signal arrives.
  5. 5Falling edge: Invert the input first with a NOT gate, then apply the same technique.

Variants

  • ▸Repeater-comparator edge detector (most common)
  • ▸Observer-based (observer IS a rising-edge detector)
  • ▸Piston-based edge detector (piston breaks dust momentarily)
  • ▸Dual-edge detector (pulses on both rising and falling edges)
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