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Picture of How to make a simple automatic Minecraft cobblestone generator!
this is a simple way to make a cobble stone generator become automatic if you havent seen my instructable on how to make a Cobble stone generator you read have to read it first.  this also shows you how to make a repeating redstone circuit.   

Step 1: Materials

Picture of Materials
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*Piston 

*cobblestone generator in my last instructable 

*redstone

*redstone repeater

*redstone torch