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Feriite toroid core what material?

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Astrid

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Hello in circuit is power inductor that I know:
- toroid radius 16,7mm 9mm with 6.3mm
- material ferrite coatated white plastic
- inductor have 10,75 turn, 1mm Cu wive
- inductance is 6uH or 9uH (Al 52nH or 78nH)
- inductor work in 15MHz

What is the core material?
 
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I agree with Erikl, that it's impossible to determine the core material form the given information. Nevertheless, you could try to make at least this information clear.
- toroid radius 16,7mm 9mm with 6.3mm
Click to expand...
I can't relate these numbers to a core geometry. Usual geometry description in datasheets is outer and inner diameter and height. Popular manufacturers are e.g. Ferroxcube and Epcos, but there are much more. You may want to check the catalogs for similar cores yourself.

The AL numbers, if correct, suggests a low permeability RF ferrite or iron powder torroid. For an exact identification, you would need to determine saturation flux and frequency dependent losses, which requires some instrumentation.
 

I think he means Outer dia as 16.7mm, inner dia as 9mm and the height or thickness 6.3mm but I will be impressed from the person who tells the material from this specifications.
 

Yes, 16.7 is outer and 9mm is inner diameter and 6.3 is height , impedance 10,75 turn on this toroid is probably 9uH.
Toroid is coated white plastic.
I see catalog Ferroxcube - ferrite cores, bobbins & accessories, but I dont find low permeability ferrite for 15MHz
 

It seems to me that there is a slight difference between radius and diameter?

Next problem, how can I imagine "10,75 turn"?

By the way, what's your actual problem? You apparently have an inductor. Do you want to reproduce it? Know it's exact data?

P.S.: The geometry refers to a standard 16 mm torroid. Fair-Rite has a core with AL = 80 nH, that comes at least near to the specification, except for the colour.
 

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    Astrid

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Apart from identifying suitable parts, you should also ask if a closed magnetic path core is appropriate for your application. If it has to do with tightly defined inductance or higher Q, you would want to go for a gapped core, I presume. If it's just a kind of choke, as your schematic from a different thread suggests, then it's O.K. of course.
 

Yes, it Inductor from the scheme in another thread, see Appendix.
Repairing old device and initially there was a ferrite toroid, unfortunately fall apart.
Among other things, I try investigates how this source of resistance has, because
next thing I expect is to recalculate the LPF 9th order for this circuit
AC power source.jpg
 

As a first guess, the influence of the inductor on the drain node output impedance won't be large, because the transistor output has considerably lower impedance, assuming it's driven to a respective power level.
 

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