Redstone Repeater

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.

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

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

From block loot
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, it.

Info
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, glass, and most jobsite blocks. $$, 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 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.

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, 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
 * a piston tries to push it or moves a block into its space

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).

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
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 1 redstone tick (equivalent to 2 game ticks, or 0.1 seconds barring lag).

A repeater's delay can be modified by using the 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' provides a half-second delay (0.4s + 0.1s = 0.5s).

A repeater set to a delay of 2 to 4 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).

Signal direction
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
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.

ID




Block data
$$, a redstone repeater's block data specifies its orientation and delay.

History
{{History||1.5|snap=13w02a| The block forms in the inventory now show the top texture, such that the powered and unpowered variants are distinguishable. {{History||1.7.2|snap=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.}} {{History||1.8|snap=?|Repeaters no longer produce block light when powered.}} {{History|||snap=14w10a|The torches underneath redstone repeaters have now been shortened, which has changed the underside textures from {{animate|Old repeater underside with long torches.png; Old Redstone Repeater with delay 2 below.png; Old Redstone Repeater with delay 3 below.png; Old Redstone Repeater with delay 4 below.png; Old Active Redstone Repeater below.png; Old Active Redstone Repeater with delay 2 below.png; Old Active Redstone Repeater with delay 3 below.png; Old Active Redstone Repeater with delay 4 below.png; Old Locked Redstone Repeater below.png; Old Locked Redstone Repeater with delay 2 below.png; Old Locked Redstone Repeater with delay 3 below.png; Old Locked Redstone Repeater with delay 4 below.png; Old Active Locked Redstone Repeater below.png; Old Active Locked Redstone Repeater with delay 2 below.png; Old Active Locked Redstone Repeater with delay 3 below.png; Old Active Locked Redstone Repeater with delay 4 below.png|32px}} to {{animate|Repeater below Revision 2.png; Repeater with delay 2 below Revision 2.png; Repeater with delay 3 below Revision 2.png; Repeater with delay 4 below Revision 2.png; Active Repeater below Revision 2.png; Active Repeater with delay 2 below Revision 2.png; Active Repeater with delay 3 below Revision 2.png; Active Repeater with delay 4 below Revision 2.png; Locked_Redstone_Repeater below Revision 2.png; Locked_Redstone_Repeater with delay 2 below Revision 2.png; Locked_Redstone_Repeater with delay 3 below Revision 2.png; Locked_Redstone_Repeater with delay 4 below Revision 2.png; Active Loacked Repeater below Revision 2.png; Active Loacked Repeater with delay 2 below Revision 2.png; Active Loacked Repeater with delay 3 below Revision 2.png; Active Loacked Repeater with delay 4 below Revision 2.png|32px}}.}} {{History||1.13|snap=17w47a|All 3 IDs for the redstone repeater have now been merged into 1 ID:. {{History||1.14|snap=18w43a|{{animate|Redstone Repeater JE3 BE2.png; Redstone Repeater Delay 2 JE3 BE2.png; Redstone Repeater Delay 3 JE3 BE2.png; Redstone Repeater Delay 4 JE3 BE2.png|32px}} {{animate|Active Redstone Repeater JE3 BE2.png; Active Redstone Repeater Delay 2 JE3 BE2.png; Active Redstone Repeater Delay 3 JE3 BE2.png; Active Redstone Repeater Delay 4 JE3 BE2.png|32px}} {{animate|Locked Redstone Repeater JE2.png; Locked Redstone Repeater Delay 2 JE2.png; Locked Redstone Repeater Delay 3 JE2.png; Locked Redstone Repeater Delay 4 JE2.png|32px}} {{animate|Active Locked Redstone Repeater JE2.png; Active Locked Redstone Repeater Delay 2 JE2.png; Active Locked Redstone Repeater Delay 3 JE2.png; Active Locked Redstone Repeater Delay 4 JE2.png|32px}} {{InvSprite|Redstone Repeater}} The textures of redstone repeaters have now been changed.}} {{History|||snap=18w50a|{{animate|Locked Redstone Repeater JE3 BE2.png; Locked Redstone Repeater Delay 2 JE3 BE2.png; Locked Redstone Repeater Delay 3 JE3 BE2.png; Locked Redstone Repeater Delay 4 JE3 BE2.png|32px}} {{animate|Active Locked Redstone Repeater JE3 BE2.png; Active Locked Redstone Repeater Delay 2 JE3 BE2.png; Active Locked Redstone Repeater Delay 3 JE3 BE2.png; Active Locked Redstone Repeater Delay 4 JE3 BE2.png|32px}} Changed the texture of bedrock, and therefore the locked repeaters.}} {{History|||snap=19w12b|Redstone repeaters can now be placed on glass, ice, glowstone and sea lanterns.}}
 * Added powered block state to redstone repeaters.
 * Redstone repeaters now render their underside, which has changed their undersides from {{animate|Repeater below Revision 2.png; Repeater with delay 2 below Revision 2.png; Repeater with delay 3 below Revision 2.png; Repeater with delay 4 below Revision 2.png; Active Repeater below Revision 2.png; Active Repeater with delay 2 below Revision 2.png; Active Repeater with delay 3 below Revision 2.png; Active Repeater with delay 4 below Revision 2.png; Locked_Redstone_Repeater below Revision 2.png; Locked_Redstone_Repeater with delay 2 below Revision 2.png; Locked_Redstone_Repeater with delay 3 below Revision 2.png; Locked_Redstone_Repeater with delay 4 below Revision 2.png; Active Loacked Repeater below Revision 2.png; Active Loacked Repeater with delay 2 below Revision 2.png; Active Loacked Repeater with delay 3 below Revision 2.png; Active Loacked Repeater with delay 4 below Revision 2.png|32px}} to {{animate|Repeater below Revision 3.png; Repeater below Revision 3.png; Repeater below Revision 3.png; Repeater below Revision 3.png; Active_Redstone_Repeater_below Revision 3.png; Active_Redstone_Repeater_below Revision 3.png; Active_Redstone_Repeater_below Revision 3.png; Active_Redstone_Repeater_below Revision 3.png|32px}}.
 * Prior to The Flattening, these blocks' numeral IDs were 93 and 94, and the item's 356.}}

{{History|pocket alpha}} {{History||0.14.0|snap=build 1|{{animate|Redstone Repeater JE2 BE1.png; Redstone Repeater Delay 2 JE2 BE1.png; Redstone Repeater Delay 3 JE2 BE1.png; Redstone Repeater Delay 4 JE2 BE1.png|32px}} {{animate|Active Redstone Repeater JE2 BE1.png; Active Redstone Repeater Delay 2 JE2 BE1.png; Active Redstone Repeater Delay 3 JE2 BE1.png; Active Redstone Repeater Delay 4 JE2 BE1.png|32px}} {{animate|Locked Redstone Repeater JE1 BE1.png; Locked Redstone Repeater Delay 2 JE1 BE1.png; Locked Redstone Repeater Delay 3 JE1 BE1.png; Locked Redstone Repeater Delay 4 JE1 BE1.png|32px}} {{animate|Active Locked Redstone Repeater JE1 BE1.png; Active Locked Redstone Repeater Delay 2 JE1 BE1.png; Active Locked Redstone Repeater Delay 3 JE1 BE1.png; Active Locked Redstone Repeater Delay 4 JE1 BE1.png|32px}} Added redstone repeaters.}} {{History|bedrock}} {{History||1.10.0|snap=beta 1.10.0.3|{{animate|Redstone Repeater JE3 BE2.png; Redstone Repeater Delay 2 JE3 BE2.png; Redstone Repeater Delay 3 JE3 BE2.png; Redstone Repeater Delay 4 JE3 BE2.png|32px}} {{animate|Active Redstone Repeater JE3 BE2.png; Active Redstone Repeater Delay 2 JE3 BE2.png; Active Redstone Repeater Delay 3 JE3 BE2.png; Active Redstone Repeater Delay 4 JE3 BE2.png|32px}} {{animate|Locked Redstone Repeater JE2 BE2.png; Locked Redstone Repeater Delay 2 JE2 BE2.png; Locked Redstone Repeater Delay 3 JE2 BE2.png; Locked Redstone Repeater Delay 4 JE2 BE2.png|32px}} {{animate|Active Locked Redstone Repeater JE2 BE2.png; Active Locked Redstone Repeater Delay 2 JE2 BE2.png; Active Locked Redstone Repeater Delay 3 JE2 BE2.png; Active Locked Redstone Repeater Delay 4 JE2 BE2.png|32px}} {{InvSprite|Redstone Repeater}} The textures of redstone repeaters have now been changed.}}

{{History|console}} {{History||xbox=TU1|xbone=CU1|ps=1.0|wiiu=Patch 1|{{animate|Redstone Repeater JE1.png; Redstone Repeater Delay 2 JE1.png; Redstone Repeater Delay 3 JE1.png; Redstone Repeater Delay 4 JE1.png|32px}} {{animate|Active Redstone Repeater JE1.png; Active Redstone Repeater Delay 2 JE1.png; Active Redstone Repeater Delay 3 JE1.png; Active Redstone Repeater Delay 4 JE1.png|32px}} Added redstone repeaters.}} {{History||xbox=TU19|xbone=CU7|ps=1.12|{{animate|Locked Redstone Repeater JE1 BE1.png; Locked Redstone Repeater Delay 2 JE1 BE1.png; Locked Redstone Repeater Delay 3 JE1 BE1.png; Locked Redstone Repeater Delay 4 JE1 BE1.png|32px}} {{animate|Active Locked Redstone Repeater JE1 BE1.png; Active Locked Redstone Repeater Delay 2 JE1 BE1.png; Active Locked Redstone Repeater Delay 3 JE1 BE1.png; Active Locked Redstone Repeater Delay 4 JE1 BE1.png|32px}} Added repeater locking to redstone repeaters.}} {{History||xbox=none|xbone=none|ps=1.90|wiiu=none|switch=none|{{animate|Redstone Repeater JE3 BE2.png; Redstone Repeater Delay 2 JE3 BE2.png; Redstone Repeater Delay 3 JE3 BE2.png; Redstone Repeater Delay 4 JE3 BE2.png|32px}} {{animate|Active Redstone Repeater JE3 BE2.png; Active Redstone Repeater Delay 2 JE3 BE2.png; Active Redstone Repeater Delay 3 JE3 BE2.png; Active Redstone Repeater Delay 4 JE3 BE2.png|32px}} {{animate|Locked Redstone Repeater JE2 BE2.png; Locked Redstone Repeater Delay 2 JE2 BE2.png; Locked Redstone Repeater Delay 3 JE2 BE2.png; Locked Redstone Repeater Delay 4 JE2 BE2.png|32px}} {{animate|Active Locked Redstone Repeater JE2 BE2.png; Active Locked Redstone Repeater Delay 2 JE2 BE2.png; Active Locked Redstone Repeater Delay 3 JE2 BE2.png; Active Locked Redstone Repeater Delay 4 JE2 BE2.png|32px}} {{InvSprite|Redstone Repeater}} The textures of redstone repeaters have now been changed.}}

{{History|new 3ds}} {{History||0.1.0|{{animate|Redstone Repeater JE2 BE1.png; Redstone Repeater Delay 2 JE2 BE1.png; Redstone Repeater Delay 3 JE2 BE1.png; Redstone Repeater Delay 4 JE2 BE1.png|32px}} {{animate|Active Redstone Repeater JE2 BE1.png; Active Redstone Repeater Delay 2 JE2 BE1.png; Active Redstone Repeater Delay 3 JE2 BE1.png; Active Redstone Repeater Delay 4 JE2 BE1.png|32px}} {{animate|Locked Redstone Repeater JE1 BE1.png; Locked Redstone Repeater Delay 2 JE1 BE1.png; Locked Redstone Repeater Delay 3 JE1 BE1.png; Locked Redstone Repeater Delay 4 JE1 BE1.png|32px}} {{animate|Active Locked Redstone Repeater JE1 BE1.png; Active Locked Redstone Repeater Delay 2 JE1 BE1.png; Active Locked Redstone Repeater Delay 3 JE1 BE1.png; Active Locked Redstone Repeater Delay 4 JE1 BE1.png|32px}} Added redstone repeaters and repeater locking.}} {{History|foot}}

Trivia

 * $$, repeaters have no bottom texture; they appear transparent when viewed from below.