If you need to quickly add numbers from 0 to 15, and you know how to rapidly convert to binary and back to decimal, this is for you...But if your human then this is just a fun project!! I'm going to show you how to make a 4 bit (0-15) adding calculator using 74xx series IC chips.
The chips that I used are the very basic gates like OR, AND, XOR, NOR, NAND, etc. No actual adding chips are used so its one level up from transistors, and it's totally TLL!**
By the way, this is another addition to the unofficial "Macroelectronics" catagory for all of you who have seen my diy ram instructables!
**If you use the 74hc series or 74hct series, then its technically not TLL, but who cares about the techincal details!!