- Joined Oct 3, 2010
I am 100% certain there used to be toroidal cores (50/60Hz electrical steel, not ferrite) available on ebay and/or Amazon, and 80% certain there were also cores available which had a primary winding but no secondary. A "wind your own secondary" type of thing. I need that now but can't find it anywhere on the internet or even just the cores. Maybe I've forgotten the right combination of words to search. Any leads?