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How can I power two vertically stacked rows of pistons, hopefully with a minimal number of repeaters? I can get the bottom row powered with just a line of redstone on the gold blocks behind as shown, but can't figure out how to do something similar for the top row at the same time.

stacked rows of pistons

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    Use inverted torches placed behind the bottom row with blocks on top – David Dec 11 '15 at 23:33
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You can actually save on the redstone torches and just raise your "golden block with redstone" line by one block.

The result is this:

enter image description here

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If you don't care about inverting the signal beforehand, simply use redstone torches behind the upper pistons to power everything:

The build

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    This works due to piston quasi-connectivity, where a piston is powered by powering the block above it. Inverting the signal with torches is not needed at all, a line of blocks with redstone dust on top next to the top piston row is sufficient. – MrLemon Dec 12 '15 at 13:03

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