Custom u cores anyone?

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Unlimited, check your messages. 

Garyb

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I would take a pair.

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Minde,

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Garyb

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I have been doing some research on the core materal used in the 5 coil VIC.

Ferrite 43 material which has a permeability of 850 (which I think is too low) and CN20 Ferrite which has a permeability of 925. Both of these materials are NiZn Ferrites which are typically used at frequencies above 500kHz.

There are also MnZn Ferrites, from what I have read these ferrites have permeabilities above 800 and are used at frequencies from 1kHz to 1MHz. So I'm thinking we need a MnZn Ferrite. Right now I'm looking trying to find an MnZn material which has a permeability around 1000. Core material selection is something I have very little experience in, but in Meyer's case I think it is very important to find the right material.

[drayden]

Hi everyone,

I'm new to this forum and I too am looking for core material to use with my experiments. I found something that may be of interest to the forum. I'm fairly sure I've identified the "E" core Stan was either using or planning to using on one of his bi-filler wound coils. Looking at this photo:

(http://i1148.photobucket.com/albums/o569/drayden7937/DSC_0234.jpg)

The upper most E core in the picture has a part number which reads OP48020???

I looked up Magnetics, Booneville, AR and found this company profile:

http://start.cortera.com/company/research/k3j0srk3j/magnetics/

Following the link to Magnetics, I then tried several different searches until at last I searched for "4802" without the OP and got this result:

http://www.mag-inc.com/home/Advanced-Search-Results?pn=4802

The first part number is for a ferrite E core part number OP48020EC

The permeability is 2,500 and capable of fairly high frequencies. Could this be a clue as to what direction was heading? Has this been noticed before and I just haven't found it in another post already? In any case I'd love to read some thoughts on this.

 

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I've have finally received the flat ferrite plates from National Magnetics in both 1600 and 2000 permability.  Since most of the folks who had said they would purchase these plates have flaked out and decided not to honor their commitments I've have some plates available.  Contact me by PM if interested.