Hello, I'm in the process of building some single ended output transformers.
I did some experiments using iron from common AC transformers, but I noticed that with DC polarization in 5 minutes, they became magnetized. The "I" are slightly attracted to the "E".
But now I found some big old high current inductors with no specifications, they were used as a battery charger. I don't know anything about the quality of their iron.
And I have no idea whether it's an amorphous nucleus or iron-silicon sheets...
I tried to magnetize it using the original winding of a few turns of thick wire and applying 12V dc, I can assure you that it was a lot of amps and at least it didn't magnetize 🙂
Do you think I can have good results?
I did some experiments using iron from common AC transformers, but I noticed that with DC polarization in 5 minutes, they became magnetized. The "I" are slightly attracted to the "E".
But now I found some big old high current inductors with no specifications, they were used as a battery charger. I don't know anything about the quality of their iron.
And I have no idea whether it's an amorphous nucleus or iron-silicon sheets...
I tried to magnetize it using the original winding of a few turns of thick wire and applying 12V dc, I can assure you that it was a lot of amps and at least it didn't magnetize 🙂
Do you think I can have good results?
Transformers for SE have DC current and must be have a gap.
https://en.wikipedia.org/wiki/Air_gap_(magnetic)
https://en.wikipedia.org/wiki/Air_gap_(magnetic)
This is silicon steel. You'll have the scrape the airgap leftovers, by using a sharpie knife, then some 80-120 grit sandpaper, the sanding direction should be parallel to the laminations and not perpendicular to avoid the risk of delamination.