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-   -   Current bias'ed Ribbon (http://www.diyaudio.com/forums/planars-exotics/204763-current-biased-ribbon.html)

Lgrau 18th January 2012 08:08 AM

Current bias'ed Ribbon
 
Hi,

I've played a bit with thin alufoil ribbon speaker (0,6my)

measurement can be found here(sorry danish):
HIFI4ALL Forum: Bånd diskant, verdens letteste membran?

so IMO the measurements look promising, but the problem is that the ribbon is so light that it's not possible to firmly allign in the magnet gap.

The airflow from a person passing will make the ribbon fluctate heavily.

So I came up with the Idea to make two layers of alufoil with a insulator inbetween, and then let a small Bias current run through the ribbons. The Bias current should push the ribbons against each other. In this way I hope to get a nice sandwich which has a good damping, and still is light, since there's no need for glue.

The weight of the Aluribbon is not a problem, I asume 15mmx150mm has the weight of aprox 2.4mg. The insulator will probably anyway be the main contributer to the weight. I was thinking about using silk or paper as insulator, any other suggestions?

It might the idea won't work, but I think it's woth the try.

I'll post measurements as soon as I made a setup.

oshifis 18th January 2012 12:58 PM

The pushing forces will cancel each other - net result is zero force...

Lgrau 18th January 2012 08:26 PM

ups you're right VERY valid point.

Another Idea could be to add a minimal weight in the bottom of the aluribbon. Not sure how this will affect the behaviour.
Will this equal having a ribbon with higher mass? -> lower Fmax and sensitivity?

george a 18th January 2012 08:34 PM

Have you tried corrugating the ribbon?
I have a large-ish ribbon 600x26mm with slight tension - no problems centering ..

Lgrau 18th January 2012 08:52 PM

it's to fragile to corrugate, just handling it without breaking the ribbon is difficult


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