4-tick pulse · 4 blocks

Every time the input changes, on or off, the output gives one short pulse of 4 ticks (0.2 s).

starts after 6 ticks (0.3 s) · made of observer, redstone lamp, repeater · fits in 1×2×3

4-tick pulseOne pulse on every switch3D view loading (or not available in this browser)

Every size 12

The best design for each size: pick one to see it.

size	blocks	numbers
2 ticks (0.1 s)	2 blocks	starts after 2 ticks (0.1 s) · needs an input of at least 2 ticks (0.1 s)
4 ticks (0.2 s) (this page)	4 blocks	starts after 6 ticks (0.3 s) · needs an input of at least 4 ticks (0.2 s)
6 ticks (0.3 s)	4 blocks	starts after 8 ticks (0.4 s) · needs an input of at least 8 ticks (0.4 s)
8 ticks (0.4 s)	4 blocks	starts after 10 ticks (0.5 s) · needs an input of at least 15 ticks (0.75 s)
10 ticks (0.5 s)	8 blocks	starts after 1 tick (0.05 s) · needs an input of at least 20 ticks (1 s)
16 ticks (0.8 s)	13 blocks	starts after 4 ticks (0.2 s) · needs an input of at least 30 ticks (1.5 s)
18 ticks (0.9 s)	22 blocks	starts after 6 ticks (0.3 s) · needs an input of at least 40 ticks (2 s)
24 ticks (1.2 s)	13 blocks	starts after 4 ticks (0.2 s) · needs an input of at least 60 ticks (3 s)
30 ticks (1.5 s)	29 blocks	starts after 6 ticks (0.3 s) · needs an input of at least 40 ticks (2 s)
32 ticks (1.6 s)	13 blocks	starts after 4 ticks (0.2 s) · needs an input of at least 60 ticks (3 s)
34 ticks (1.7 s)	27 blocks	starts after 6 ticks (0.3 s) · needs an input of at least 80 ticks (4 s)
40 ticks (2 s)	13 blocks	starts after 4 ticks (0.2 s) · needs an input of at least 80 ticks (4 s)

Try it

Hold IN under the view for a long press, tap it for a short one: the box marked OUT turns red while the output is on. Press play under the view to watch a demo on a loop; touch any other control to take over.

How this design does it: The input lights a lamp, which goes off 4 ticks after the input does; an observer watching the lamp pulses on each change, and a repeater stretches each pulse to 4 ticks: a dual-edge detector of 4 ticks for inputs of 4 ticks or more, half what the observer facing the input needs.

Build it

Download .litematic Download the design as text

The .litematic opens in Litematica (Minecraft 26.3): every block of the design in one region. The text file is the same build written as plain text, block by block.

Blocks used: observer redstone lamp repeater stone

Details: how it works, measurements and properties

In depth

Every time the input changes (turns on or turns off), the output gives one short pulse of L = 4 ticks (0.2 s), 6 ticks (0.3 s) rising / 10 ticks (0.5 s) falling after the change. It handles every input pulse of 4 ticks (0.2 s) or longer.

Use it to react to any change of a lever, in both directions.

How to try it

Press play under the view to watch the demo on a loop (the badge reads demo with the step it is on; the same sequence is drawn as a timing diagram below). Touch any control to stop it and try the circuit yourself.

To try it: press and hold the IN button of the bar (or the cell tagged IN) to power that input; a quick tap sends a short 2-tick pulse.

Inputs are tagged in lime; the output is tagged OUT: the orange glass marker next to it glows while the output is on (the output strip by the demo badge shows its last 40 game ticks, 2 seconds). Drag to look around, pinch or scroll to zoom, step one game tick at a time with the step button.

Inputs and output over time

The input follows this schedule (the 3D view's demo plays the same). Lime: an input is on; orange: the output is on (taller = a stronger signal, 1 to 15). Time runs left to right in game ticks (20 ticks = 1 s).

Swipe the diagram sideways: the whole sequence lasts 473 ticks (23.65 s).

Step by step (11 lines)

in  2 ticks (0.1 s): +6 for 8  <- not handled
in  3 ticks (0.15 s): +6 for 9  <- not handled
in  4 ticks (0.2 s): +6 for 4, +14 for 4
in  5 ticks (0.25 s): +6 for 4, +15 for 4
in  6 ticks (0.3 s): +6 for 4, +16 for 4
in  8 ticks (0.4 s): +6 for 4, +18 for 4
in 10 ticks (0.5 s): +6 for 4, +20 for 4
in 15 ticks (0.75 s): +6 for 4, +25 for 4
in 20 ticks (1 s): +6 for 4, +30 for 4
in 30 ticks (1.5 s): +6 for 4, +40 for 4
in 40 ticks (2 s): +6 for 4, +50 for 4

Measurements

metric	value	what it means
L	4 ticks (0.2 s)	the length of the output pulse
delay	6 ticks (0.3 s) rising / 10 ticks (0.5 s) falling	the time from the input's edge to the start of the output pulse
min-pulse	4 ticks (0.2 s)	the shortest input pulse handled correctly (every longer one works too)
tileable	every 1 (1 0 0)

Notes from its designer

The input lights a lamp, which goes off 4 ticks after the input does; an observer watching the lamp pulses on each change, and a repeater stretches each pulse to 4 ticks: a dual-edge detector of 4 ticks for inputs of 4 ticks or more, half what the observer facing the input needs. Read from the repeater, copies stand side by side every block.

Properties

Study	Pulse shapers
Kind	One pulse on every switch (dual-edge detector)
Blocks placed	4 (not counting the input levers or buttons the view adds)
Box	1×2×3 (6 blocks of space)
Made of (the blocks that change state)	observer, redstone lamp, repeater
Inputs / outputs	IN (repeater) / OUT
Design file	`pulse-dual-lamp-repeater-L4`

The design file

on GitHub

Design file (21 lines)

# One pulse on every switch: 4-tick pulse · 4 blocks
# https://vjeux.github.io/redstonepedia/circuits/pulse/pulse-dual-lamp-repeater-L4.html
name: pulse-dual-lamp-repeater-L4
circuit: dual-edge
tile: 1 0 0
port input: 0 0 2
port output: 0 0 -1
origin: 0 0 -1
palette:
  O minecraft:observer[facing=south,powered=false]
  R minecraft:redstone_lamp[lit=false]
  S minecraft:stone
  r minecraft:repeater[delay=2,facing=south,locked=false,powered=false]
layer -1:
  S
  .
  .
layer 0:
  r
  O
  R