Hi everyone! I need your help in my project. We were asked to make a score board that can inrement 1, 2 and 3. Also it can decrement 1. I already did the bcd to seven segment decoder using only logic gates. My problem is after 9 it doesnt go back to zero. Could you help me about this. Only logic gates can be used.It should add 1, 2 or 3 not in the series. ex. if it display 4 you push the button for 2 increment it will be 6 also if you push the button increment of 3 it will display 9. And Yes only logic gates are required for ex. if we used flipflop it should be in logic gates form. By the way it is from 0-999

 

ENOUGH!!! STOP!!!!

You ALREADY have TWO threads on this. PLEASE, only use the first one you started:

https://forum.allaboutcircuits.com/threads/score-board-increment-and-decrement.145587/