There's a really detailed description of that kit (including full schematic) here: http://shop.emscdn.com/KitInstrux/555/555_principles_revB3.pdf http://shop.em

There's a really detailed description of that kit (including full schematic) here: http://shop.emscdn.com/KitInstrux/555/555_principles_revB3.pdf http://shop.emscdn.com/KitInstrux/555/555_principles_revB3.p...