Quote Originally Posted by T.Jackson View Post
Luciano is correct. There is an error on the schematic that shows Q0 instead of Q4 of IC7 connecting to the MR (master reset line) of IC3.
...which might explain why it worked for me.
I only built a portion of this project using only the first 4017. I 'simulated' the rest of the 4017's using some glue logic, specifically, a PIC setup to pick off the clock pulses into the timer on the PIC and generate a reset pulse after it got to the last column.