This circuit is perfect for beginners who want to control a 7 segments display in very simplified way, i just use some logic sources to trigger the decoder IC and no need for voltage sources/current sources or even grounding, the decoder already provide enough power and current to display number 0 to letter F
INSTRUCTIONS BELOW
1. The A button is for number 1
2. The B button is for number 2
3. Button A + B is for number 3
4. The button C is for number 4
5. Button C+A is for number 5
6. Button C+B is for number 6
7. Button C+A+B is for number 7
8. The button D is for number 8
9. Button D+A is for number 9
10. Button D+B is for letter A
11. Button D+A+B is for letter B
12. Button D+C is for letter C
13. Button D+A+C is for letter D
14. Button D+B+C is for letter E
15. Button A+B+C+D is for letter F
Thank you if this was helpful
