REDSTONEPEDIA › Circuits › Pulse shapers
Signal shortener (pulse limiter)
at most 38 ticks (1.9 s) · 17 blocks
However long the input stays on, the output pulse lasts at most 38 ticks (1.9 s).
starts after 2 ticks (0.1 s) · needs an input of at least 3 ticks (0.15 s) · made of comparator, redstone wire, repeater · fits in 2×2×5
Every size 24
The best design for each size: pick one to see it.
| size | blocks | numbers |
|---|---|---|
| 2 ticks (0.1 s) | 2 blocks | starts after 4 ticks (0.2 s) · needs an input of at least 6 ticks (0.3 s) |
| 4 ticks (0.2 s) | 8 blocks | starts at once · needs an input of at least 2 ticks (0.1 s) |
| 6 ticks (0.3 s) | 8 blocks | starts at once · needs an input of at least 2 ticks (0.1 s) |
| 7 ticks (0.35 s) | 12 blocks | starts after 4 ticks (0.2 s) · needs an input of at least 3 ticks (0.15 s) |
| 8 ticks (0.4 s) | 8 blocks | starts at once · needs an input of at least 2 ticks (0.1 s) |
| 10 ticks (0.5 s) | 5 blocks | starts after 1 tick (0.05 s) · needs an input of at least 2 ticks (0.1 s) |
| 12 ticks (0.6 s) | 9 blocks | starts after 2 ticks (0.1 s) · needs an input of at least 3 ticks (0.15 s) |
| 14 ticks (0.7 s) | 9 blocks | starts after 2 ticks (0.1 s) · needs an input of at least 3 ticks (0.15 s) |
| 15 ticks (0.75 s) | 12 blocks | starts after 4 ticks (0.2 s) · needs an input of at least 3 ticks (0.15 s) |
| 16 ticks (0.8 s) | 9 blocks | starts after 2 ticks (0.1 s) · needs an input of at least 3 ticks (0.15 s) |
| 18 ticks (0.9 s) | 13 blocks | starts after 2 ticks (0.1 s) · needs an input of at least 3 ticks (0.15 s) |
| 20 ticks (1 s) | 13 blocks | starts after 2 ticks (0.1 s) · needs an input of at least 3 ticks (0.15 s) |
| 22 ticks (1.1 s) | 13 blocks | starts after 2 ticks (0.1 s) · needs an input of at least 3 ticks (0.15 s) |
| 23 ticks (1.15 s) | 12 blocks | starts after 4 ticks (0.2 s) · needs an input of at least 3 ticks (0.15 s) |
| 24 ticks (1.2 s) | 13 blocks | starts after 2 ticks (0.1 s) · needs an input of at least 3 ticks (0.15 s) |
| 26 ticks (1.3 s) | 13 blocks | starts after 2 ticks (0.1 s) · needs an input of at least 3 ticks (0.15 s) |
| 28 ticks (1.4 s) | 13 blocks | starts after 2 ticks (0.1 s) · needs an input of at least 3 ticks (0.15 s) |
| 30 ticks (1.5 s) | 13 blocks | starts after 2 ticks (0.1 s) · needs an input of at least 3 ticks (0.15 s) |
| 31 ticks (1.55 s) | 12 blocks | starts after 4 ticks (0.2 s) · needs an input of at least 3 ticks (0.15 s) |
| 34 ticks (1.7 s) | 17 blocks | starts after 2 ticks (0.1 s) · needs an input of at least 3 ticks (0.15 s) |
| 36 ticks (1.8 s) | 17 blocks | starts after 2 ticks (0.1 s) · needs an input of at least 3 ticks (0.15 s) |
| 38 ticks (1.9 s) (this page) | 17 blocks | starts after 2 ticks (0.1 s) · needs an input of at least 3 ticks (0.15 s) |
| 127 ticks (6.35 s) | 12 blocks | starts after 4 ticks (0.2 s) · needs an input of at least 3 ticks (0.15 s) |
| 511 ticks (25.55 s) | 12 blocks | starts after 4 ticks (0.2 s) · needs an input of at least 3 ticks (0.15 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: Cuts every input to one fixed length, from a comparator and a loop of repeaters.
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: comparator redstone wire repeater stone
Details: how it works, measurements and properties
In depth
However long the input stays on, the output pulse lasts at most L = 38 ticks (1.9 s); it starts 2 ticks (0.1 s) after the input turns on. (An input shorter than L may come out shorter.) It handles every input pulse of 3 ticks (0.15 s) or longer.
Use it to cut a long signal down to a short, fixed pulse.
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 redstone lamp in that cell (the view adds it to show the output) lights 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 1081 ticks (54.05 s).
Step by step (13 lines)
in 2 ticks (0.1 s): no output <- not handled in 3 ticks (0.15 s): +2 for 3 in 4 ticks (0.2 s): +2 for 4 in 5 ticks (0.25 s): +2 for 5 in 6 ticks (0.3 s): +2 for 6 in 8 ticks (0.4 s): +2 for 8 in 10 ticks (0.5 s): +2 for 10 in 15 ticks (0.75 s): +2 for 15 in 20 ticks (1 s): +2 for 20 in 30 ticks (1.5 s): +2 for 30 in 40 ticks (2 s): +2 for 38 in 60 ticks (3 s): +2 for 38 in 80 ticks (4 s): +2 for 38
Measurements
| metric | value | what it means |
|---|---|---|
| L | 38 ticks (1.9 s) | the length of the output pulse |
| delay | 2 ticks (0.1 s) | the time from the input's edge to the start of the output pulse |
| min-pulse | 3 ticks (0.15 s) | the shortest input pulse handled correctly (every longer one works too) |
Notes from its designer
Cuts every input to one fixed length, from a comparator and a loop of repeaters.
Properties
| Study | Pulse shapers |
|---|---|
| Kind | Signal shortener (pulse limiter) |
| Blocks placed | 17 (not counting the input levers or buttons and the lamp the view adds) |
| Box | 2×2×5 (20 blocks of space) |
| Made of (the blocks that change state) | comparator, redstone wire, repeater |
| Inputs / outputs | IN (repeater) / OUT |
| Design file | pulse-limiter-u-L38-v20-17b |
The design file
Design file (27 lines)
# Signal shortener: at most 38 ticks (1.9 s) · 17 blocks # https://vjeux.github.io/redstonepedia/circuits/pulse/pulse-limiter-u-L38-v20-17b.html name: pulse-limiter-u-L38-v20-17b circuit: pulse-limiter port input: 0 1 0 port output: 2 1 0 origin: 0 0 0 palette: A minecraft:repeater[delay=2,facing=south,locked=false,powered=false] B minecraft:repeater[delay=4,facing=north,locked=false,powered=false] C minecraft:comparator[facing=west,mode=subtract,powered=false] D minecraft:repeater[delay=4,facing=south,locked=false,powered=false] R minecraft:redstone_wire S minecraft:stone r minecraft:repeater[delay=1,facing=south,locked=false,powered=false] layer 0: .S SS SS SS .S layer 1: .C Br BA BD SR