I made this in my Redstone world.
It is the smallest I've ever seen.

To build it you will need;

4 solid blocks.
1 ore.
1 redstone dust.
2 redstone torches.

If you like it, give it a Diamond!
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The Resource pack in the pictures was made by me and can be found here;http://www.planetminecraft.com/texture_pack/forgecraft_x64/