Hi, we are having a problem with making a binary to BCD converter. The first picture is the converter while the second picture is the add3 circuit. We have used 42 ICs in total. Whatever the input is, the outputs are always logic 1. We are sure about the connections. We are guessing that there is not enough current in the circuit since where only using a 5V supply. What can we do to make it work? Thank you!!!

