Wow thanks man! Really helpful information, this was exactly what I was looking for. I thought a ferrite core would usually be insulated, and even if it isn't would actually need to be surrounding an incoming signal, or current. Anyways thanks for the accurate information and schematics. Very useful! "Ferrite" gets thrown around a lot (the word comes from the Latin word for iron, ferrum, and it is generally used to describe (unsurprisingly) iron - https://en.wikipedia.org/wiki/Ferrite) - it isn't a "ferrite bead" however (https://en.wikipedia.org/wiki/Ferrite_bead) which are used to filter/reject high frequency noise (usually in/on wiring - you see them a lot on things like laptop power supplies' cords). Ah ok, gotcha. Well thanks for clearing that up.