Redstone Repeater

Redstone Repeater

Renewable	Yes
Stackable	Yes (64)
Tool	Any tool
Blast resistance	0
Hardness	0
Luminant	No
Transparent	Yes
Flammable	No
Catches fire from lava	No

This article is about the block. For repeater circuits, see Transmission circuit § Repeater. For other topics related to redstone, see Redstone (disambiguation).

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

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

Breaking

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 is removed and drops itself as an item if:

• its attachment block is moved, removed, or destroyed;
• water or lava flows into its space;‌^{[Java Edition only]}
• or a piston tries to push it or moves a block into its space.

Natural generation

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

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

Crafting

Ingredients	Crafting recipe
Redstone Torch + Redstone Dust + Stone

Usage

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 be placed only on top of opaque blocks (dirt, stone, etc.), on top of upside-down slabs, upside-down stairs, furnaces, and glass. In Bedrock Edition, a repeater can also be placed on fences and stone walls. They can also be placed on some transparent blocks. See Opacity/Placement for more information. 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

A repeater transmits signals only 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:

• an active power component (redstone torch, lever, block of redstone, etc.)
• powered redstone dust
• a powered redstone comparator or another powered redstone repeater facing the repeater
• a powered opaque block (including any opaque mechanism components, such as dispensers, redstone lamps, etc.)

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

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

When initially placed, a redstone repeater has a delay of one redstone tick (equivalent to two 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 one redstone tick, to a maximum of four redstone ticks, then back to one redstone tick. Longer delays can be made with multiple repeaters – for example, a repeater set to 'four' and another to 'one' provides a half-second delay (0.4s + 0.1s = 0.5s).

A repeater set to a delay of two to four redstone ticks increases 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 changes a 1-tick, 2-tick, or 3-tick on-pulse into a 4-tick on-pulse, and does 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 that repeat a signal with no delay).

(In Bedrock Edition, the first repeater have a delay of zero but the repeater is still showing 1-tick)

Signal direction

See also: Mechanics/Redstone/Transmission circuit § Diode

A redstone repeater acts as a "diode" – it allows redstone signals through in one direction (unlike redstone dust or opaque blocks that 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

See also: Mechanics/Redstone/Memory circuit

The left repeater has been locked in an unpowered output state by the right repeater.

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

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 does not switch states.

Sounds

Java Edition:

Sound	Subtitle	Source	Description	Namespaced ID	Translation key	Volume	Pitch	Attenuation distance
	Block broken	Blocks	Breaking the block	block.wood.break	subtitles.block.generic.break	1.0	0.8	16
	None	Blocks	Falling on the block with fall damage	block.wood.fall	None	0.5	0.75	16
	Block breaking	Blocks	Mining the block	block.wood.hit	subtitles.block.generic.hit	0.25	0.5	16
	Block placed	Blocks	Placing the block	block.wood.place	subtitles.block.generic.place	1.0	0.8	16
	Footsteps	Blocks	Walking on the block	block.wood.step	subtitles.block.generic.footsteps	0.15	1.0	16

Bedrock Edition: ^{[needs in-game testing]}

Sound	Description	Namespaced ID	Volume	Pitch
?	Breaking the block	dig.wood	?	0.8
?	Falling on the block with fall damage	fall.wood	?	?
?	Mining the block	hit.wood	?	0.5
?	Jumping from the block	jump.wood	?	?
?	Falling on the block without fall damage	land.wood	?	?
?	Walking on the block	step.wood	?	?
?	Placing the block	use.wood	?	0.8

Data values

ID

Java Edition:

Name	Namespaced ID	Translation key
Redstone Repeater	repeater	block.minecraft.repeater

Bedrock Edition:

Redstone Repeater	Namespaced ID	Numeric ID	Translation key
Unpowered block	unpowered_repeater	93	tile.unpowered_repeater.name
Powered block	powered_repeater	94	tile.powered_repeater.name
Item	repeater	356	item.repeater.name

Block data

See also: Data values

In Bedrock Edition, 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.

Block states

See also: Block states

Java Edition:

Name	Default value	Allowed values	Description
delay	1	1 2 3 4	The redstone repeater's delay in redstone ticks.
facing	north	east north south 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	false	false true	True if the repeater is currently locked.
powered	false	false true	If the redstone repeater is lit.

Bedrock Edition:

Name	Default value	Allowed values	Description
repeater_delay	0	0 1 2 3	The redstone repeater's delay in redstone ticks minus 1.
direction	0	0 1 2 3	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.

History

Java Edition Beta
1.3					Added redstone repeaters.
					The block form of redstone repeaters, when in the inventory, shows the smooth stone slab side texture.
					Originally, the four possible settings were "1, 2, 5 and 7", but Jeb decided to change the settings to "1, 2, 3, and 4".
Java Edition
1.3.1		12w22a			Redstone repeaters now naturally generate inside jungle temples.
1.4.2		12w42a			The textures of redstone repeaters have now been changed.
					Added repeater locking to redstone repeaters.
1.5		13w02a			The block forms in the inventory now show the top texture, such that the powered and unpowered variants are distinguishable.
1.7.2		13w37a			The item forms of block IDs 93 (unlit repeater) and 94 (lit repeater) have now been 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.
		14w10a			The torches underneath redstone repeaters have now been shortened, which has changed the underside textures from to .
1.13		17w47a			All 3 IDs for the redstone repeater have now been merged into 1 ID: repeater.
					Added powered block state to redstone repeaters.
					Redstone repeaters now render their underside, which has changed their undersides from to .
					Prior to The Flattening, these blocks' numeral IDs were 93 and 94, and the item's 356.
1.14		18w43a			The textures of redstone repeaters have now been changed.
		18w50a			As the texture of bedrock has been changed, the textures of locked redstone repeaters have also now been changed.
		19w12b			Redstone repeaters can now be placed on glass, ice, glowstone and sea lanterns.
Pocket Edition Alpha
0.14.0		build 1			Added redstone repeaters.
Bedrock Edition
1.2.0		beta 1.2.0.2			Redstone repeaters now render their underside, which has changed their undersides from to .
1.10.0		beta 1.10.0.3			. The textures of redstone repeaters have now been changed.
Legacy Console Edition
TU1	CU1	1.0	Patch 1	1.0.1	Added redstone repeaters.
TU19	CU7	1.12			Added repeater locking to redstone repeaters.
		1.90			The textures of redstone repeaters have now been changed.
New Nintendo 3DS Edition
0.1.0					Added redstone repeaters and repeater locking.

Issues

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

Gallery

• 

  A redstone clock formed from a redstone torch and a repeater.

• 

  A redstone clock formed from two repeaters.

References

Redstone

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Blocks

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Items

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