Re: [TCML] specs for the larger ferrites I'd offered on the list

[Steve Ward <steve.ward@xxxxxxxxx>]

Bill,

Im sure they were, they used them most likely for differential mode
inductors (chokes) as they would be excellent in such an application (where
there is a large DC bias on the core).  They are also commonly used as
inductors for various switching supplies.

Really, anyone who wants to use these just has to do their homework, they
are indeed useful items, though i happen to have plenty of my own cores so i
wont be needing any myself ;-)

Steve

On Tue, Sep 15, 2009 at 12:27 AM, Bill Noble <william_b_noble@xxxxxxx>wrote:

> ok, you guys are the experts - what I do know is that these were used for
> EMI filters on super duper expensive stereo equipment (specifically, $16,000
> each monoblocks, I believe) - so my original thought was that they would be
> good for protective inductors for NST driven coils - I don't know what
> material the smaller ones are - there are no markings
> ----- Original Message ----- From: "Quarkster" <quarkster@xxxxxxx>
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Sent: Monday, September 14, 2009 2:05 PM
> Subject: Re: [TCML] specs for the larger ferrites I'd offered on the list
>
>
>
>  Bill -
>>
>> These cores are actually made from Molypermalloy powder
>> (nickel-iron-molybdenum), not ferrite.
>>
>> This material has very low permeability, and is used for specialized
>> inductors. Not usable for gate drive transformers in solid-state Tesla
>> coils, where high permeability ferrite cores are needed.
>>
>> Regards,
>> Herr Zapp
>> ----- Original Message ----- From: "Bill Noble" <william_b_noble@xxxxxxx>
>> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
>> Sent: Sunday, September 13, 2009 5:26 PM
>> Subject: [TCML] specs for the larger ferrites I'd offered on the list
>>
>>
>>  I found the spec sheet for the torroids, here
>>>
>>> http://www.mag-inc.com/File%20Library/Product%20Datasheets/Powder%20Core/New%20Powder%20Cores/Toroids/930%20Size/C055930A2.pdfIt is from their MPP series, read about that series here
>>> http://www.mag-inc.com/products/powder_cores/mpp They say: MPP cores
>>> possess many outstanding magnetic characteristics, such as high resistivity,
>>> low hysteresis and eddy current losses, excellent inductance stability after
>>> high DC magnetization or under high DC bias conditions and minimal
>>> inductance shift up to 2000 gauss under AC conditions. Applications include
>>> Flyback Transformers, Buck/Boost and Power Factor Correction (PFC),
>>> Inductors, In-Line Noise Filters, High Q Filters, and Resonant Circuits.I
>>> have probably 100 of them (haven't counted), at 25 cents each -
>>> shippingdepends on quantity, but will never be more than $11
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>>
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