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-   -   Omni Ribbon (http://www.diyaudio.com/forums/planars-exotics/208174-omni-ribbon.html)

båndsei 5th March 2012 04:41 PM

Omni Ribbon
 
I am in the proces of making a omni ribbon like the one from Raal.
[IMG]http://img209.imageshack.us/img209/6574/0012yq.jpg[/IMG]
Here the steelwork.There is 16 magnets 70x10x6mm.
More later.

Bernt"Båndsei"

båndsei 5th March 2012 04:51 PM

[IMG]http://img838.imageshack.us/img838/108/omni002.jpg[/IMG]
Magnets are placed as in a planar and the ribbons have to be app. 2mm in front of the magnets.Picture shows a test.

Bernt

a.wayne 5th March 2012 05:05 PM

How are you going to control phase issues with the rear wave .....

båndsei 5th March 2012 05:34 PM

[IMG]http://img571.imageshack.us/img571/8894/raal381.jpg[/IMG]
I am inspired by this one.
The inside of the"tube" has to be dampened .

Bernt

båndsei 20th March 2012 06:50 PM

[IMG]http://img819.imageshack.us/img819/3287/dsc01960tp.jpg[/IMG]
My second attempt to make a omni ribbon. It plays,but it has low sensivity.It has 6 ribbons playing in fase ,a sort of bipole i think. I have to listen to it in a setup like this one:
[IMG]http://img834.imageshack.us/img834/3245/dsc01952or.jpg[/IMG]

Bernt

khbaur330162 21st March 2012 12:20 AM

Very cool. Idk how thin that micropore tape is that you're using, but this might be a good candidate to etch your diaphragm on Aluminized Mylar due to its size and the sensitivity issue.

Watching with interest.

george a 21st March 2012 09:09 PM

HI Bernt

Which way are the magenetic poles of your magnets facing?

Outwards as per a planar bass unit or face to face as in a normal ribbon tweeter.
If the former , this may account for your low sensitivity.

Also are you using a transformer ? - how are these units being driven?

stujonesmd 21st March 2012 09:29 PM

I find diy ribbon speakers fascinating. I have had some experience with commercial low cost ribbon drivers, most notably the HiVi $40 or so ribbon tweeters, the lower cost Beston ribbon tweeters, and the larger (and, prior to Chinese Neodymium Ripoff, very inexpensive) Dayton ribbon midrange-tweeters. The Daytons, in particular, sound very good to me, and are still inexpensive enough to justify purchase of 4-6 units for an array. I am currently using 2 of these mounted on top (!) of smaller MTM home brew (dual 5" woofer, single Titanium dome tweeter) small (12 x 10 x 7 inch) boxes, mounted under a desk (which is why the top mounted ribbons). For home brew speakers these sound pretty good.

Has anyone here tried to use radial wire embedded in the speaker membrane for a home brew ribbon?

båndsei 22nd March 2012 06:55 AM

In the first model with 16 ribbons magnets are outwards in the second one with 6 ribbons they are face to face.Resistance is 3.5 ohm,so no use for transformer.

I am only using small tape behind the membrane and 16mm on top and bottom.
Later i may use mylar .

Bernt

Andrén 24th March 2012 12:59 PM

I could recommend you to put damping material in the middle, and try to make it more stuffed in the middle and less stuffed towards the ribbons.

Also try to have som tension in the ribbon itself, that will give you some more output, and make sure the ribbons is well centered in the magnet gap.

Good luck!


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