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 Help with ferrites...		  New Topic  Reply to Topic
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namzer0
Apprentece

Afghanistan
7 Posts
Posted - Nov 16 2009 :  9:42:06 PM  Show Profile  Reply with Quote
Is there any fixed value for a ferrite transformer's core?
I mean permeability value?

like in here:
http://img.alibaba.com/photo/251218486/ferrite_transformers.jpg

I'm having problem computing for inductance when it involves cores.
Its easy to compute when its air core.

some site considers 98% ferrite, 95%, element, etc... with different values...

getting confused with it and with my ferrites...
Thanks!

audioguru
Nobel Prize Winner

Canada
4218 Posts
Posted - Nov 17 2009 :  11:17:40 AM  Show Profile  Reply with Quote
Go to the website of a ferrite core manufacturer like Ferroxcube (by Philips) and look at their datasheets.
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namzer0
Apprentece

Afghanistan
7 Posts
Posted - Nov 17 2009 :  7:46:08 PM  Show Profile  Reply with Quote
The problem is, I don't know what or who the manufacturer is...
But it's from a nokia cellphone charger.
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audioguru
Nobel Prize Winner

Canada
4218 Posts
Posted - Nov 17 2009 :  7:48:32 PM  Show Profile  Reply with Quote
Then you need to guess about its spec's.
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mrgone
Nobel Prize Winner

USA
1176 Posts
Posted - Nov 17 2009 :  8:12:16 PM  Show Profile  Reply with Quote
Wrap a few turns and measure the inductance. Some volt meters have inductance measuring.
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namzer0
Apprentece

Afghanistan
7 Posts
Posted - Nov 19 2009 :  02:11:05 AM  Show Profile  Reply with Quote
quote:
Originally posted by audioguru

Then you need to guess about its spec's.


no Idea about how should I estimate...
1 will be my favorite value ^_^

this one might be easy to estimate... from your AM receiver
http://www.angelfire.com/electronic2/index1/loopstick.html

quote:
Originally posted by mrgone

Wrap a few turns and measure the inductance. Some volt meters have inductance measuring.


I don't have that kind of multimeter...
But I'll make one some time...
after I'm done with my guitar wah... (the inductor is the last problem... 500mH)
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namzer0
Apprentece

Afghanistan
7 Posts
Posted - Nov 23 2009 :  06:11:21 AM  Show Profile  Reply with Quote
Aw, do you think a value of 100 will be ok? I really don't know what range of values do ferrites have...
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