User:MentalMouse42/Sandbox/Misc Diagrams 1

Tiny Charcoal Generator
Source]

It's supposed to feed its product back into the furnace to fuel itself. However, it was an April 1 (2013) posting, so it warrants testing. At first test: Looks like it will not accumulate any charcoal in the chest until both the furnace and the hopper feeding it fuel (level 2) are full. The hopper can be "stuffed" with four non-fuel items in its last four slots, as long as you leave the first slot open for fuel. Then the chest will start getting charcoal after two stacks of charcoal are produced, which will require 2-$1/4$ stacks of wood.

If more than 5-6 stacks of wood are available, another chest can be placed atop the upper hopper.

As usual, using a hopper to take product from a furnace forfeits any experience from the smelting.

cobblestone generator
From video http://www.youtube.com/watch?v=E0jeCUt8ko8. This generator fits in a 4&times;3 hole, 5 deep with a couple of blocks in the layer below that. The bottom-layer components are directly below the on/off switch. When building the clock (top row of layers 0 and 1), place the repeater before covering the level 0 components. Build switch column early, and flip it twice to pick up the block (turning off the clock). Then finish the top wall and work in 3&times;3. Place water first. then lava. Place any height limiters you want for the four columns, and fill the middle column with some non-pickaxe block -- sand, gravel, or wood will do fine. (That's just so your loot doesn't get stranded between the columns.) Then turn it on long enough to push up the blocks above the cobblestone, and mine those.