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Old 18th January 2012, 08:08 AM   #1
Lgrau is offline Lgrau  Denmark
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Default 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.
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Old 18th January 2012, 12:58 PM   #2
oshifis is offline oshifis  Hungary
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The pushing forces will cancel each other - net result is zero force...
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Old 18th January 2012, 08:26 PM   #3
Lgrau is offline Lgrau  Denmark
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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?
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Old 18th January 2012, 08:34 PM   #4
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Have you tried corrugating the ribbon?
I have a large-ish ribbon 600x26mm with slight tension - no problems centering ..
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Old 18th January 2012, 08:52 PM   #5
Lgrau is offline Lgrau  Denmark
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it's to fragile to corrugate, just handling it without breaking the ribbon is difficult
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