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Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
I'm in need for a large ferrite core, which I can imagine is hard to get and expensive. I was thinking, I have a lot of smaller cores, wouldn't it be possible to break these down and make one big core? If this is possible, how it would be accomplished?
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Plasmaddict wrote ...
I'm in need for a large ferrite core, which I can imagine is hard to get and expensive. I was thinking, I have a lot of smaller cores, wouldn't it be possible to break these down and make one big core? If this is possible, how it would be accomplished?
Jan, have you looked at this?
I'm pretty sure he'll be happy to sell you one, + shipping shouldn't be too bad at all considering it's not overseas.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Marko wrote ...
Jan, have you looked at this?
I'm pretty sure he'll be happy to sell you one, + shipping shouldn't be too bad at all considering it's not overseas.
Hmm, GBP 9.99 cost, GBP 9.40 shipping to CZE, total GBP 19.39 or USD $38.5, this is a bit out of my price range... Actually my price range is $0 if I can make a big core from several small ones...
Registered Member #690
Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616
I don't know how you would go about making a large core from small ones. I mean, I know ferrite cores are very tolerant to being glued together when they break, but as far as this goes I don't think it will turn out too well.
You can get ferrite powder, sold as Iron (II,III) Oxide or Fe3O4, off of Ebay or various pyrotechnic suppliers like Skylighter or Firefox. I still have about 2 pounds of it for making thermite. What if you took some of this, being a very fine powder, and put it in like a 20 ton hydraulic press or something? You could make a couple very large blocks and glue them together.
I know that much more than this goes into making actual cores, such as the inclusion of a dielectric and so on, but the powder will only cost a few dollars and then you just find a press to use. That's just what first comes to my mind; maybe someone who knows more about ferrites from an electronics standpoint can comment.
Registered Member #1232
Joined: Wed Jan 16 2008, 10:53PM
Location: Doon tha Toon!
Posts: 881
You might consider connecting several smaller ferrite power transformers in series/parallel to achieve the power level you require, if ETD-59 or E66 core sets are still too small.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
GeordieBoy wrote ...
You might consider connecting several smaller ferrite power transformers in series/parallel to achieve the power level you require, if ETD-59 or E66 core sets are still too small.
Richie- I have a question for you. In all textbooks I have seen, in a section with transformers, there is a formula for calculating maximum power of a transformer. According to it, the power rises with the SQUARE of the cross-sectional area! This is against common sense but it seems to work at least with iron lamination transformers. Does this mean that if I "pack" two identical cores together, will the available power rise to 4 times that of a single core? Or is there something I'm missing?
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Homemade ferrite core?
