Good evening friend Carlos, for your information I will send you 4 photos of the circuit, the list of components and the diagram.
I put this project together on a protoboard, and it didn't work, I thank you very much if you can help me. Good luck.
Good afternoon friend Carlos, I have not been able to send you the photos that I offered, I do not know what happens that they do not load I do not know if the page or the internet is the problem, I will keep trying. Good luck.
The first thing you have to verify is that on leg 24 of IC SN74154 you have 4.5volts of power and that legs 11-18 and 19 are grounded.
This integrated is responsible for lighting the LEDs and even if all the rest of the circuitry was bad, you would have to light a led by force.
The LED that would light would correspond to the 4-digit binary numbering of the input of the integrated SN74154, even if the four inputs corresponding to pins 20-21-22-y 23 are zero.
Good evening friend Jose Miguel, very grateful for your information but there is a detail are not the same diagram or list of materials.
I will send you 4 photos, 1 of the diagram, 1 of the list and 2 electrical circuit. Good luck.
Good afternoon friend Jose, I have not been able to send the photos that I offered, since they do not load I do not know if it is the page or the Internet I will keep trying. Good luck.
If you see that you cannot open a new query. Perhaps what happens is that qualifying as solved is the reason for not being able to upload them.
Good morning friend Jose, I had to open a question again to be able to send the photos. Thank you.