Circuits could be used for many electronic stuff on minecraft, so first there would be a redstone circuit, then a gold circuit, next a gold compound circuit, then a diamond circuit and lastly a Mother Board Circuit.
These could be used for telporters solar panels and other devices.
It could really change minecraft because so far there is hardly any technology
The numbers on your keyboard will represent each crafting square and I will say which items go into each number.

Redstone Circuit: 1 ~ iron ingot, 2 ~ iron ingot, 3 ~ iron ingot, 4 ~ redstone, 5 ~ redstone, 6 ~ redstone

Gold Circut: 1 ~ gold ingot, 2 ~ gold ingot, 3 ~ gold ingot, 4 ~ gold ingot, 5 ~ redstone circuit, 6 ~ gold ingot

Compound Gold Circut: 1 ~ iron ingot, 2 ~ iron ingot, 3 ~ iron ingot, 4 ~ Gold Circuit, 5 ~ Redstone circut,
6 ~ Gold Circuit, 7 ~ Glass Pane, 8 ~ Glass Pane, 9 ~ Glass pane

Diamond circut: 1 ~ iron ingot, 2 ~ iron ingot, 3 ~ iron ingot, 4 ~ Gold Circuit, 5 ~ diamond, 6 ~ Gold Circuit

Mother Board: 1 ~ Glass Pane, 2 ~ obsibian, 3 ~ Glass Pane, 4 ~ Compound Gold Circuit, 5 ~ Diamond Circut,
6 ~ Compound gold circuit, 7 ~ Glass Pane, 8 ~ obsibian, 9 ~ Glass pane