From GameWatcher: “Fallout 76 has got a veritable tonne of various resources to get a hold of in various quantities, especially when it comes to crafting and maintaining some of the more advanced technological items such as energy weapons and power armour.
Fallout 76 Circuits are one such item, required not only for tech-stuff but also for certain chems and connectors. Circuits are one of the key components and you’d do well to always have a stack ready to go. Here, you’re going to learn where best to find some.”
Source: N4G PC Fallout 76 Circuitry – Where to Find Circuitry in Fallout 76?