I made this 4-bit binary adder, with the great help from this great person here,
and it works like a true charm. I thought that this adder, however, is only for "simple" adding, so I tried to find a way to make it work for numbers in the two's complement system.
So the circuit should (?) have a probe that shows when there's overflow.
I thought that might a AND-3 gate with the first two switches (S1, S5) and the final carry probe as inputs, but that's not quite of a solution.
Do you guys have any idea?