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Old 15th September 2010, 12:18 AM   #51
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by bentl View Post
Just a thougt;

What difference does it make if ...........
the simple rule

north in the palm of your hand

signal in the direction of your finger

and it moves in the direction of your thumb

this should be true all over the diaphragm
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Old 21st September 2010, 09:07 AM   #52
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Default HI BENTL

Tried your suggestion but gave up after a while, the magnets kept moving and touching each other. It would need the magnets being glued in position. And aluminium bars placed in between each row till the glue set. Then if there was no improvement in the sensitivity you would have a job removing magnets! I don't have the patience for this so will stick with my original design. If anybody out there feels up to the challenge ? I wish you good luck. You'll need it!
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Old 21st September 2010, 09:23 AM   #53
bentl is offline bentl  Norway
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Hi,

as long as one uses some distance pieces of plastic or wood its quite simple.

Picture shows first row in place. I put down the magnets with plastic pieces between them. Then I flip the panel upside down, and apply a drop of superglue through the perforation. The capillary effect sucks the superglue between the perforated plate and magnet and it sticks!

mounting.JPG

I discovered something strange when mounting the magnets - I used a little toy compass to determine the orientation. After a while the compass' magnetization was reversed and i started to mount the magnets wrong...

Now i have a "master magnet" where I have marked N and S and use it to determine orientation

the magnets are fittet with 25mm clearance to the frame, and 15mm distance between columns. 10 mm distance between magnets lengthwize.


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Bent
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Old 21st September 2010, 10:00 AM   #54
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Let me know how it sounds in comparison to the older design. Keep the pictures coming, well done. But shouldn't the magnets be around the other way? I would have placed the magnets 90 degrees differently I am confused by your layout! Must be getting old!!
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Old 21st September 2010, 10:13 AM   #55
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Quote:
Originally Posted by tinitus View Post
the simple rule

north in the palm of your hand

signal in the direction of your finger

and it moves in the direction of your thumb

this should be true all over the diaphragm
Left or right hand?
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Old 21st September 2010, 10:39 AM   #56
bentl is offline bentl  Norway
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Hi,

i don't think that the layout of the magnets matter very much.

If you arrange them in rows or columns you use about the same length of magnets and coil I guess (havent calculated on yet)

In my design I plan to run the alu conductor across the diaphragm without folding it - and connect the parallell conductors with a piece of wire with cable shoes.

As far as I know; Apogee used horisontal rows of magnets, while Magnepan uses columns. If you look at Båndsei's planars, he also uses columns of magnets and the design very diy-friendly in my eyes.

I will post some more pictures in a while but are trapped at work and the progress on the project is very low..

Quote:
Originally Posted by JAMESBOS View Post
Let me know how it sounds in comparison to the older design. Keep the pictures coming, well done. But shouldn't the magnets be around the other way? I would have placed the magnets 90 degrees differently I am confused by your layout! Must be getting old!!
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Old 21st September 2010, 11:54 AM   #57
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by JonasKarud View Post
Left or right hand?


as you imply, it wont tell you the whether its actual north or south pole

it doesnt matter as long as you do it the same way all through
but its only useful at the theoretical design stage

as suggested by Bentl, during actual build its practical to have a small master magnet with poles properly marked

actual polarity on finished design is determined the usual and simple way, with small a battery

but be aware that non traditional magnet design could act very different from expected
its by far not simple
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Old 23rd September 2010, 10:44 PM   #58
tmblack is offline tmblack  United Kingdom
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What type of magnets are used ie N-S thru long side or NS on top/bottom face?

And how are the magnet poles arranged?
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Old 24th September 2010, 08:17 AM   #59
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North and south on the large faces, I use 50 x 12.7 x 3 mm neo magnets. Magnets placed on the perforated steel sheet in alternate rows NSNSNS etc and the alu tape over the edges of the magnets ie between the NS interface. Hope this helps.
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Old 24th September 2010, 04:54 PM   #60
tmblack is offline tmblack  United Kingdom
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Yes a big help.
I found some that are 0.500" x 2.00" x 0.125".
What is a good place to buy them in North America, I found some for under $2 for very large number?
How many magnets did you use in a pair?

Does anyone know what size of magnet Magnepan and Apogee used?
The Magneplanar is much lighter than equivalent Apogee.
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