How to make a digital count-down timer?

I haven't had time to write this one either. I just started rebuilding my website, but here's a partial parts list so you can start saving.

You will need:
555 timer IC
solderless breadbord or project pc-board.
common-cathode 7 segment displays
74LS48 IC
74LOS192 IC (If memory serves me correctly.)
Assorted Resistors and capacitors.

I will add more soon. I will take pictures as I build it. I think I pretty much have everything to make it, except a couple chips. I'll keep you posted. Check back later. Last Updated: 11/07/2009

Mother Earth!