http://imgur.com/keozu.jpg
http://imgur.com/bmrpH.jpg
http://imgur.com/BFpGe.jpg
http://imgur.com/I4fWO.jpg
http://imgur.com/NGWGt.jpg
http://imgur.com/VycM7.jpg
http://imgur.com/qlObq.jpg
http://imgur.com/b3Svk.jpg
http://imgur.com/b3Svk.jpg
http://imgur.com/8s8im.jpg
1) 2 boards in position and cut out marked.
2) Ready to cut out hole with jig saw.
3) Hole cut out.
4) Perforated steel sheet ready to cut with scissors.
5) Perforated steel sheet in place.
6) Magnets in position.
7) Tape position marked down sides.
8) Tape position marked.
9) Finished article in position.
I hope this helps JonasKarud,
http://imgur.com/bmrpH.jpg
http://imgur.com/BFpGe.jpg
http://imgur.com/I4fWO.jpg
http://imgur.com/NGWGt.jpg
http://imgur.com/VycM7.jpg
http://imgur.com/qlObq.jpg
http://imgur.com/b3Svk.jpg
http://imgur.com/b3Svk.jpg
http://imgur.com/8s8im.jpg
1) 2 boards in position and cut out marked.
2) Ready to cut out hole with jig saw.
3) Hole cut out.
4) Perforated steel sheet ready to cut with scissors.
5) Perforated steel sheet in place.
6) Magnets in position.
7) Tape position marked down sides.
8) Tape position marked.
9) Finished article in position.
I hope this helps JonasKarud,
Just a thougt;
What difference does it make if I have a odd or even number of colums with alternating oriented magnets
I am considering 5 or 6 colums with 800mm lengths of 10 mmwide magnets
If I only run the film between columns 5 or any other odd number seems to be a sound solution - foil will start and end on the same side of the diaphragm
Bent
What difference does it make if I have a odd or even number of colums with alternating oriented magnets
I am considering 5 or 6 colums with 800mm lengths of 10 mmwide magnets
If I only run the film between columns 5 or any other odd number seems to be a sound solution - foil will start and end on the same side of the diaphragm
Bent
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
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!
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!
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!
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.
Regards
Bent
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!
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.
Regards
Bent
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..
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..
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!!
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
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.
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.