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Redstone Repeater

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Redstone Repeater
Redstone Repeater.gif
Active Redstone Repeater.gif

Transparency

Yes (partial)

Luminance

No (7 when powered, in Bedrock Edition)

Blast resistance

0

Tool

Any tool

Renewable

Yes

Stackable

Yes (64)

Flammable

No

Availability

Survival, Creative

Drops
Data values

See Data values

Name

See Data values[until 1.13]
repeater[upcoming 1.13]

A redstone repeater is a block used in redstone circuits to "repeat" redstone signals back to full strength, delay signals, prevent signals moving backwards, or to "lock" signals in one state.

Obtaining[edit]

A redstone repeater can be obtained by crafting, by looting jungle temples, or by breaking a previously-placed repeater.

Breaking[edit]

A redstone repeater can be broken instantly using any tool, or without a tool, and drops itself as an item. To remove a redstone repeater, mine it.

A redstone repeater will also be removed and drop itself as an item:

  • if its attachment block is moved, removed, or destroyed
  • if water flows into its space
  • if a piston tries to push it or moves a block into its space

If lava flows into a redstone repeater's space, the redstone repeater will be destroyed without dropping itself as an item.

Crafting[edit]

Ingredients Crafting recipe
Redstone Torch +
Redstone +
Stone











Natural generation[edit]

A redstone repeater generated in the jungle temple's hidden room.

A single redstone repeater is generated naturally in each jungle temple.

Usage[edit]

See also: Redstone circuit

A redstone repeater can be used in four different ways: to "repeat" redstone signals back to full strength, delay signals, prevent signals moving backwards, or to "lock" signals in one state.

A repeater can only be placed on top of opaque blocks (dirt, stone, etc., but not glass, leaves, etc.), or on top of upside-down slabs, upside-down stairs, and hoppers. In Bedrock edition, a repeater can also be placed on glass, stone walls, fences and cauldrons. To place a repeater, use the Place Block control.

A redstone repeater has a front and back – the arrow on the top points to the repeater's front. A repeater also has two small redstone torches on its top – the color of the torches indicates whether its output is on (dark red when off, bright red when on) and the distance between them indicates the delay the repeater adds to the signal transmission.

A repeater is 0.125 (1/8) blocks high.

Signal transmission[edit]

A repeater only transmits signals from its back to its front, but its behavior can be modified from the side (see signal locking, below).

Different ways to power a repeater

A redstone repeater can be powered by any of the following components at its back:

A redstone repeater can power any of the following components at its front:

  • redstone dust
  • a redstone comparator or another redstone repeater facing away from the repeater
  • any opaque block (including any opaque mechanism components)

A redstone repeater can activate any mechanism component it is facing.

An opaque block powered by a redstone repeater is called "strongly-powered" (as opposed to an opaque block "weakly-powered" by redstone dust). A strongly-powered opaque block can power adjacent redstone dust, as well as other redstone components.

Signal repeating[edit]

See also: Transmission circuit § Repeater

A redstone repeater can "repeat" a redstone signal, boosting it back up to power level 15.

Redstone signals have a maximum power level of 15 and that level drops by 1 for every block of redstone dust the signal travels through. If a signal must travel through more than 15 blocks of redstone dust, a redstone repeater can be used to boost the signal back up to full strength. An extra two blocks of distance can be achieved by placing solid opaque blocks before and after the repeater.

While redstone repeaters can allow signals to travel great distances, each always adds some delay to the transmission since the minimum amount of delay is 1 redstone tick (0.1 seconds, barring lag).

Signal delay[edit]

When initially placed, a redstone repeater has a delay of 1 redstone tick (equivalent to 2 game ticks, or 0.1 seconds barring lag).

A repeater's delay can be modified by using the Use Item control. Each use increases the repeater's delay by 1 redstone tick, to a maximum of 4 redstone ticks, then back to 1 redstone tick. Longer delays can be made with multiple repeaters – for example, a repeater set to '4' and another to '1' will give a half second delay (0.4s + 0.1s = 0.5s).

A repeater set to a delay of 2 to 4 redstone ticks will increase the length of any shorter on-pulse to match the length of the repeater's delay, and suppress any shorter off-pulse. For example, a repeater set to a 4-tick delay will change a 1-tick, 2-tick, or 3-tick on-pulse into a 4-tick on-pulse, and will not allow through any off-pulse shorter than 4 ticks.

Although a repeater cannot be set to have a delay of zero, instant repeater circuits are possible (circuits which repeat a signal with no delay).

Signal direction[edit]

See also: Transmission circuit § Diode

A redstone repeater acts as a "diode" – it will only allow redstone signals through in one direction (unlike redstone dust or opaque blocks which can transmit redstone signals in any direction).

A diode can be used to protect a redstone circuit from redstone signals feeding back into the circuit from its output, or can be used to isolate one part of a circuit from another.

Signal locking[edit]

See also: Memory circuit
The left repeater has been locked in an unpowered output state by the right repeater.
Redstone Repeater Inactive Locked.pngRedstone Repeater Active Locked.png

A redstone repeater can be "locked" by another powered redstone repeater facing its side. When locked, the repeater will not change its output (whether powered or unpowered), no matter what the input does. When the side repeater turns back off, the repeater will go back to its normal behavior.

A repeater can also be locked by a powered redstone comparator facing its side. This offers additional possibilities for locking signals because a comparator's output can be affected from 3 sides as well as by containers.

While a repeater is locked, the small movable redstone torch on top will change into a bedrock bar, indicating its locked status. This occurs when it is locked by a repeater, but not by a comparator unless it is in subtract mode.[Java and Legacy Console editions only]

If a repeater is locked again too quickly after unlocking (e.g. the lock is controlled by a fast clock circuit), or the lock and the input are changed only on the same tick (e.g. because they're fed by the same clock and both repeaters have the same delay), the repeater will not switch states.

Data values[edit]

A redstone repeater is defined by its ID and block data. A redstone repeater also has a block state which is expected to replace the functionality of block data in a future version.

ID[edit]

A redstone repeater's ID specifies whether it is currently powered.

Redstone Repeater ID Name Numerical ID
Block (inactive) unpowered_repeater 93
Block (active) powered_repeater 94
Item repeater 356

[until 1.13]

Block data[edit]

See also: Data values

A redstone repeater's block data specifies its orientation and delay.

Bits Values
0x1
0x2
A two-bit field storing a value from 0 to 3 specifying the direction the redstone repeater is facing:
  • 0: Facing north.
  • 1: Facing east.
  • 2: Facing south.
  • 3: Facing west.
0x4
0x8
A two-bit field storing a value from 0 to 3 specifying the redstone repeater's delay:
  • 0: Delay of 1 redstone tick.
  • 1: Delay of 2 redstone tick.
  • 2: Delay of 3 redstone tick.
  • 3: Delay of 4 redstone tick.

Effectively, add the repeater's facing value (0 to 3) to 4×(delay-1). For example, a repeater facing west with a delay of 3 redstone ticks would have a block data value of 3 + 4×(3-1) = 11.[until 1.13]

Block state[edit]

See also: Block states
Name Value Description

 delay
1–4 The redstone repeater's delay in redstone ticks.

 facing
north
south
east
west
The direction from the output side to the input side of a repeater.
The opposite from the direction the player faces while placing the repeater.

 locked
true
false
True if the repeater is currently locked.

 powered[upcoming 1.13]
true
false
If the redstone repeater is lit.

Video[edit]

History[edit]

Camera-photo.png
This page would benefit from the addition of one or more images.
Please remove this notice once you've added suitable images to the article. The specific instructions are: Inventory sprite of the old redstone repeater technical block
Beta
1.3 Old Redstone Repeater.pngOld Active Redstone Repeater.pngA Added redstone repeaters. Originally the four possible settings were "1, 2, 5 and 7",[1] but this was changed to "1, 2, 3, and 4".[2]
Official release
1.3.1 ? Redstone repeaters naturally generate inside jungle temples.
1.4.2 12w42a Added repeater locking.
Redstone Repeater.pngActive Redstone Repeater.pngA Changed repeater texture.
1.7.2 13w37a The item forms of block IDs
93 (unlit repeater) and
94 (lit repeater) were removed from the game. They can no longer exist in inventories, only as blocks in the world.
1.8 ? Repeaters no longer produce block light when powered.
Upcoming Java Edition
1.13 17w47a All 3 IDs for the redstone repeater got merged into 1 ID: repeater.
Added powered block state.
Repeaters now render the underside.
Pocket Edition Alpha
0.14.0 build 1 Added redstone repeaters.
Legacy Console Edition
TU1 CU1 1.0 Patch 1 Added redstone repeaters.
TU19 CU7 1.12 Added repeater locking.

Issues[edit]

Issues relating to "Redstone Repeater" are maintained on the bug tracker. Report issues there.

Trivia[edit]

  • Repeaters have no bottom texture, which means they will appear see-through when viewed from below.[until 1.13]

References[edit]


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