[kellys_eye]

Is there any way to get information on the ferrite cores that I'd salvage from ex PC PSU's? most of which are unmarked.

I've found that generous use of a heat gun (and gloves) allows one to dismantle them neatly and save core, former and wire for re-use but there will come a point in my experimentation where the ferrite (or dust iron?) will become an issue for me - or not?

Although my initial thoughts were aimed at the larger cores, I do have a number of much smaller ones that were used in the standby supply circuitry which may be a better place to start experimenting by limiting the actual power levels achievable whilst still getting me the experience I need.