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Pulse circuit

Pulse limiter (8 game ticks)

Make a short activation from a longer request.

6 × 3 footprint1 layer11 blocksTested in 4 rotationsJava Edition 26.2
Open in the simulatorBuild it in the game

Layout

Layer 0 (on the floor)
lever [face=floor, facing=north, powered=false] at x 0, z 0redstone dust at x 1, z 0repeater [facing=west, delay=1] at x 2, z 0comparator [facing=west, mode=subtract] at x 3, z 0redstone dust at x 4, z 0redstone lamp at x 5, z 0redstone dust at x 1, z 1redstone dust at x 1, z 2repeater [facing=west, delay=4] at x 2, z 2redstone dust at x 3, z 2repeater [facing=south, delay=1] at x 3, z 1
redstone dustrepeater or comparatorinputlamparrows point where a device sends its output; north is up

How it works

The comparator subtracts two differently delayed copies of the input. A rising edge makes a 8-game-tick raw output pulse; holding the input produces no further pulses. Wait 20 game ticks between input changes. The lamp remains visible four game ticks after the wire turns off.

  1. Two differently delayed copies of the request feed a subtract comparator.
  2. The later side signal cancels the earlier main signal after eight game ticks of raw output; a lamp can remain lit longer.

Timing

Measured at the output: a pulse of 8 game ticks (0.40 s) per event.

Inputs and outputs

  • Inputlever (x 0, y 0, z 0)
  • Outputraw pulse (x 4, y 0, z 0)
  • Indicatordicator: lamp (x 5, y 0, z 0)

Blocks you need

5 × redstone dust, 3 × repeater, 1 × lever, 1 × comparator, 1 × redstone lamp.

Build it in the game: 11 commands

Relative to where you stand, with x running east and z running south. Paste one line at a time into chat, or into a chain of command blocks. The block art is the game's own; the layout is what the page above shows.

setblock ~0 ~0 ~0 minecraft:lever[face=floor,facing=north,powered=false]
setblock ~1 ~0 ~0 minecraft:redstone_wire
setblock ~2 ~0 ~0 minecraft:repeater[facing=west,delay=1]
setblock ~3 ~0 ~0 minecraft:comparator[facing=west,mode=subtract]
setblock ~4 ~0 ~0 minecraft:redstone_wire
setblock ~5 ~0 ~0 minecraft:redstone_lamp
setblock ~1 ~0 ~1 minecraft:redstone_wire
setblock ~1 ~0 ~2 minecraft:redstone_wire
setblock ~2 ~0 ~2 minecraft:repeater[facing=west,delay=4]
setblock ~3 ~0 ~2 minecraft:redstone_wire
setblock ~3 ~0 ~1 minecraft:repeater[facing=south,delay=1]