Author Topic: Need Help! ( ferrite core )  (Read 2166 times)

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Offline mzdenkov

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Need Help! ( ferrite core )
« on: June 17, 2014, 07:42:44 pm »
Hello!

So as I said in subject name, I need help.
Recently I've opened some old and not working  AM/FM radios and i found some
ferrite cores/rods like this one on pic. :
http://upload.wikimedia.org/wikipedia/commons/6/62/Ferrite_antenna.jpg

So can someone tell me or link me the datasheet of this? because im having some
ideas to use them in some projects, but the problem is that I dont know the characteristics of that
rods and that makes some problems while doing some calculations for the coils, etc.


Thanks!
To Solder or not to solder, that is the question!
 

Offline gibbled

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Re: Need Help! ( ferrite core )
« Reply #1 on: June 17, 2014, 08:36:50 pm »
This might get you started...

http://www.amidoncorp.com/rods-and-tiles/
 

Offline mzdenkov

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Re: Need Help! ( ferrite core )
« Reply #2 on: June 17, 2014, 09:37:08 pm »
Hmmm, thanks... i will give it  a try. They only give  frequnecy interval where the rods work, but not the magnetic properties of the rod (magnetic loss, B/H (Magnetic Hysteresis) properties).

Now at least i have a clue where to look.

Thanks!
To Solder or not to solder, that is the question!
 

Offline T3sl4co1l

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Re: Need Help! ( ferrite core )
« Reply #3 on: June 17, 2014, 11:49:23 pm »
Impossible to say exactly.

Without taking measurements, it's very likely it's:
MnZn ferrite
mu >= 500
Fo > 1MHz
Bmax >= 0.3T

Further, it might be very similar to a Fair-Rite #77 (generic all-purpose, mu=2000), or #33 (lower mu, near zero tempco).

It's unlikely to be very high mu (doesn't matter a damn for a rod; low cutoff frequency), or NiZn (lower Bmax which won't matter, but higher cost and lower mu will matter).

If you want more, Amidon does indeed have #33 rods in various sizes.

Tim
Seven Transistor Labs, LLC
Electronic design, from concept to prototype.
Bringing a project to life?  Send me a message!
 

Offline mzdenkov

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Re: Need Help! ( ferrite core )
« Reply #4 on: June 18, 2014, 02:11:28 am »

MnZn ferrite
mu >= 500


Can you tell me for what "mu" stands for?
To Solder or not to solder, that is the question!
 

Offline Rigby

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Re: Need Help! ( ferrite core )
« Reply #5 on: June 18, 2014, 02:13:30 am »
In context, guessing, it looks like a magnetic permeability measurement.
 

Offline T3sl4co1l

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Re: Need Help! ( ferrite core )
« Reply #6 on: June 18, 2014, 03:03:14 am »
Yes, relative permeability.

Needless to say, you need formulas that use mu, to calculate anything.  Example:


Tim
Seven Transistor Labs, LLC
Electronic design, from concept to prototype.
Bringing a project to life?  Send me a message!
 

Offline mzdenkov

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Re: Need Help! ( ferrite core )
« Reply #7 on: June 18, 2014, 04:08:20 pm »
I know about forumulas, because i have used them on one or two college courses, but they are a little bit
diffirent.
To Solder or not to solder, that is the question!
 


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