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Old 13th December 2013, 02:11 PM   #1
Tenson is offline Tenson  United Kingdom
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Default Help Finding Magnets

Hi Guys,

Can anyone help me find some neo magnets measuring 50mm (long) x 3.5mm (wide) x 2mm (thick)?

I want to try and modify an existing tweeter that has spaces in the frame for these. They could be 3mm wide if it is more common. I can only find 10mm wide. They must be common though as I have seen these long thin sticks in B&G, Hi-Vi and OEM planar tweeters.
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Old 13th December 2013, 09:02 PM   #2
WrineX is offline WrineX  Netherlands
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would love to have some as well, in neo thin magnets are britle and break easy thats why they are not common. only on special order. and then you ahve to get many of them. usually shops wont risk it
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Old 14th December 2013, 08:18 AM   #3
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Here you can get 3,5x2x30mm or 25 or20mm length:NdFeB Magnet. Neodym und ferrit magnete - Shop ENES Magnet Magnete - Dauermagnete - NdFeB Magnete Quader mittel <br /> (L. 12 - 30 mm) - Strona pierwsza

Bernt

Last edited by båndsei; 14th December 2013 at 08:20 AM.
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Old 14th December 2013, 08:51 AM   #4
multi is offline multi  Australia
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What about the magnets out of Computer hard drives?
Tons of old Hard drives around.
Phil
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Old 14th December 2013, 01:18 PM   #5
Tenson is offline Tenson  United Kingdom
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So.. does it work just to stick two magnets end to end? Doesn't the break cause strange things to happen in the field?
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Old 14th December 2013, 03:07 PM   #6
WrineX is offline WrineX  Netherlands
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you can simulate this pretty easy in femm, there is a How to somehwere on this forum. its pretty nice. you can exaclty see what happens when.


if ur mnagnet top are north and bottom are south, at the ends they dont want to be against eachother since north rejects north (and you dont want to flip them). but even for me i hope somone can confirm that haha

Last edited by WrineX; 14th December 2013 at 03:10 PM.
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Old 14th December 2013, 03:33 PM   #7
Tenson is offline Tenson  United Kingdom
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That's right as I've just tried it yesterday.

I tried FEM once before and gave up quickly. I guess a guide would be helpful!
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Old 14th December 2013, 04:18 PM   #8
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Hi There,
I did a little experiment were I made a magnetometer to find the effects of the gap between end stacked magnets and that can be found here,

How to make a good transformer for ribbon tweeter?

Also, I did find out with the thing that, everytime you double the stack size (thickness) you double the total strength of the Magnetic Flux.
Just like connecting batteries in series.

jer
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Old 15th December 2013, 12:51 PM   #9
Tenson is offline Tenson  United Kingdom
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Thanks, that is good to know!

Clever idea to use a simple megnetometer by the way.
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