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Carriers
Redstone dust behaves as a wire that carries signals. The signal strength drops by 1 level per piece of dust. Powered Redstone dust has a particle effect.
Dots of dust strongly power in all directions
Lines strongly power in only one direction
Repeaters take a redstone signal as input and boost the signal strength to 15.
They are directional: the end next to the switch is the input and the output is next to the torch.
They output only to the block directly in front of them and won't power adjacent blocks.
They delay transmission by one tick by default, which can be increased to four ticks.
A repeater can be locked/latched. preventing it from changing its state (either powered or unpowered), by:
Placing another powered repeater facing its side.
Placing a powered comparator facing its side.
A repeater that is locked too quickly after unlocking where the input is changed on the same tick will not change states.