The Buffer Gate is a Redstone Logic device. When placed, the input is nearest to the player. The other three sides are output only, making this gate a diode much like the Redstone Repeater. The three output squares will only emit a signal if it receives a Redstone signal from its input side, allowing for the creation of one way circuits.
The Buffer Gate can be rotated using the Screwdriver or Sonic Screwdriver by right-clicking. Holding the "shift" key while right-clicking will disable the left or right or both outputs.
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It's better to use this device instead of the normal vanilla repeater, if you want to place it in a corner.
A powered Buffer Gate.
The Buffer Gate also can be used as a repeater with three outputs, as there is
Buffer Gate with the right output disabled.
a slight delay between the time when a Redstone current reaches the buffer and when the buffer outputs a redstone current. This delay can be used for a "runway effect" with lights in a pathway.
It could also be used to split a Redstone current into three, great for compact redstone circuits.