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båndsei 26th August 2012 01:04 PM

Diy AMT
 
I have been inspired from this tread in a Danish site:HIFI4ALL Forum: Lyd laboratoriet
And have made this one:
[IMG]http://img834.imageshack.us/img834/4369/dsc02085nd.jpg[/IMG]
My second attempt:
[IMG]http://img827.imageshack.us/img827/332/0012tdd.jpg[/IMG]
[IMG]http://img840.imageshack.us/img840/531/dsc02073l.jpg[/IMG]
Here how the magnets are placed on two 10x10mm.square iron.

More later.

Bernt

tyu 26th August 2012 03:47 PM

Thank for the info...an pic...vary cool......goodluck

studiotech 26th August 2012 04:40 PM

Nice work! Did you buy the diaphragm already made?

Greg

båndsei 26th August 2012 05:04 PM

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.

Lgrau 26th August 2012 06:00 PM

Hi Båndsei,

Cool project ;-), did you already make a stereo set? and how's the sound compared to your Bipole Ribbon speaker?

båndsei 26th August 2012 07:58 PM

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.

båndsei 27th August 2012 05:38 PM

[IMG]http://img600.imageshack.us/img600/6549/amtu.png[/IMG]
Here is mesurement at 40cm.distance.
Distortion increaces below 1.1khz.Mesurement is limited at 500hz. 48db.

Bernt.

solhaga 27th August 2012 07:07 PM

Very interesting.
How varies the flux in the gap?

Quote:

Originally Posted by båndsei (Post 3140904)
I would like to attach immages from FEMM directly,but how is it done?

If you are on Windows, Snipping tool?

båndsei 27th August 2012 08:26 PM

[IMG]http://img528.imageshack.us/img528/2306/amt1field.jpg[/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

solhaga 27th August 2012 09:07 PM

The Flux variation in the gap is more or less what I got in a narrower 25 mm gap with N42 NEOs:
https://lh5.googleusercontent.com/-c...88/Capture.JPG

https://lh4.googleusercontent.com/-w...ture%25204.JPG

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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