Electrical Engineering Challenge: September Winners (Sponsored by NetBurner) Posted on 2015/09/29 by Circuit Cellar Staff The answer to the September Electrical Engineering Challenge is now live. Congratulations to the winners: John Barraclough (United Kingdom) and Pieter Willemsen (Belgium). The error is in line 28. There needs to be a second open parenthesis. The next Challenge launches on October 1, 2015. Good luck!