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Old 26th August 2012, 01:04 PM   #1
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Default Diy AMT

I have been inspired from this tread in a Danish site:HIFI4ALL Forum: Lyd laboratoriet
And have made this one:
[IMG]Click the image to open in full size.[/IMG]
My second attempt:
[IMG]Click the image to open in full size.[/IMG]
[IMG]Click the image to open in full size.[/IMG]
Here how the magnets are placed on two 10x10mm.square iron.

More later.

Bernt
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Old 26th August 2012, 03:47 PM   #2
tyu is offline tyu  United States
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Thank for the info...an pic...vary cool......goodluck
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Old 26th August 2012, 04:40 PM   #3
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Nice work! Did you buy the diaphragm already made?

Greg
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Old 26th August 2012, 05:04 PM   #4
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Yes, I bought 2 diaphragms from ESS amt 1 app.100 euro. each.
Magnets are the same as i always use 6x10x70mm. 8 pcs. app.3 euro each.
Bernt.
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Old 26th August 2012, 06:00 PM   #5
Lgrau is offline Lgrau  Denmark
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Hi Båndsei,

Cool project ;-), did you already make a stereo set? and how's the sound compared to your Bipole Ribbon speaker?
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Old 26th August 2012, 07:58 PM   #6
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I like them.They added more "air" on top,and a bit "cleaner".Sensivity increased by at least 6-8db.Impressive for the amount of magnets.My omnipole´s used 24 magnets each.
Yes i have a stereo set,it`s not that difficult to build.I would like to attach immages from FEMM directly,but how is it done?

Bernt Båndsei.

Last edited by båndsei; 26th August 2012 at 08:00 PM.
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Old 27th August 2012, 05:38 PM   #7
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[IMG]Click the image to open in full size.[/IMG]
Here is mesurement at 40cm.distance.
Distortion increaces below 1.1khz.Mesurement is limited at 500hz. 48db.

Bernt.
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Old 27th August 2012, 07:07 PM   #8
solhaga is offline solhaga  Sweden
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Very interesting.
How varies the flux in the gap?

Quote:
Originally Posted by båndsei View Post
I would like to attach immages from FEMM directly,but how is it done?
If you are on Windows, Snipping tool?
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Old 27th August 2012, 08:26 PM   #9
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[IMG]Click the image to open in full size.[/IMG]
This shows fieldstrength across the diaphragm 40mm. width.
Be free to ask other questions,I am willing to share.
Is snipping Tool part of office pack?

Bernt
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Old 27th August 2012, 09:07 PM   #10
solhaga is offline solhaga  Sweden
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The Flux variation in the gap is more or less what I got in a narrower 25 mm gap with N42 NEOs:
Click the image to open in full size.

Click the image to open in full size.

I assume that the ribbon comprises aluminium strips, do the widths of the strips vary with were there are in the gap so that the force will be more even through the gap?

The frequency response doesn't seem to have the 2 to 6 kHz hump, this is probably due to the wider gap and the tilted positioning of the NEOs together with the pipe isolation leaving no narrow cavity as with ordinary ribbon drivers.

What resistance do they end up with?

Snipping Tool is a part of Windows Vista and 7
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