Throughout the game you will come across circuits that you can use to upgrade your guns. Some are better then others but it is still nice to collect them all. This guide will help you find them all as you go!
via N4G: pc news feed http://n4g.com/news/1167377/dead-space-3-circuit-locations
via N4G: pc news feed http://n4g.com/news/1167377/dead-space-3-circuit-locations