High-tech computer parts consisting of thin plastic wafers etched with metal wiring. Circuitry is mainly used for high-tech weapon modifications, as well as building turrets and other high-end electronics for settlements.
Circuitry is a bit harder to come by, but with it marked as searched the Sole Survivor should find it rather easily. The best place to get some circuitry is in destroyed turrets, which the player character should come across around Diamond City, or during missions.
The following merchants all sell shipments of 25 circuitry: