I've taken a number of toroid cores out of SMPS's used for desktop computers. My questions is how to know that whether they're powdered iron cores or ferrite cores or something else?
I assume those SMPS's are switched at something 15KHz or like that. So they would be just iron cores? They shows conductivity on surface using DMM test. I hope ferrite cores won't conduct. Also I'm aware of that the cores will be polished with non conductive coating. I've removed that before testing.
I want to use them for 10.7MHz FM IF stages and discriminator stages. Is that sufficient for this purpose? Please enlighten me.
I assume those SMPS's are switched at something 15KHz or like that. So they would be just iron cores? They shows conductivity on surface using DMM test. I hope ferrite cores won't conduct. Also I'm aware of that the cores will be polished with non conductive coating. I've removed that before testing.
I want to use them for 10.7MHz FM IF stages and discriminator stages. Is that sufficient for this purpose? Please enlighten me.