about the circuit given by on1aag, i found difficulities when i want to try it. maybe i can get a little info on how i can use the circuit. from my observation, i only need to feed in 1 4bit binary number isnt it? sorry, but i'm not very clear with the circuit yet.
so far, i already manage to get my first 7 segment to display the left decimal output ( eg. '0' for '05' and '1' for '10') but i still cant figure out on how to make my second 7segment display the right decimal output.
I try to find as much altenative as i could. now, i'm still searching for the 74185 converter but at the same time, i tried some other ways. i tried to modify my friend's 4 bit adder design, but i couldnt find way either.