You use a red stone repeater to delay redstone signals, to extend the range of redstone (12 blocks), or to transmit signals through solid blocks.
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First, find a red stone block. To obtain it, use a stone to diamond pickaxe on it. Collect your dust.
Ah the redstone repeater, a very useful item, here is how you use it: - = redstone wire > = redstoen repeater -->--------- You have to make sure you place the repeater the direction the redstone is traveling. Also when you click on the repeater, the torches move right? That is for setting delay on the repeater or in different words setting how long it takes for the redstone signal to pass through the repeater. Enjoy your redstone circuts :)
To open an iron door you can use a pressure plate lever button (reccamended) red stone torch/powder detecto rail
The Wooden Button wasn't created until Minecraft 1.4.2, but the stone was made in Alpha 1.0.1. You use a Stone block on the crafting table or even in your inventory on your quick-craft area and that's it. This creates the Stone Button. If you want to make the Wooden Button, use any kind of Wooden Planks and place one on any slot in the crafting area.
A leaf stone it will become vileplume.