Current bias'ed Ribbon - diyAudio
Go Back   Home > Forums > Loudspeakers > Planars & Exotics
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Planars & Exotics ESL's, planars, and alternative technologies

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 18th January 2012, 08:08 AM   #1
Lgrau is offline Lgrau  Denmark
diyAudio Member
Lgrau's Avatar
Join Date: Nov 2003
Location: Aalborg
Default Current bias'ed Ribbon


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.
  Reply With Quote
Old 18th January 2012, 12:58 PM   #2
diyAudio Member
Join Date: Mar 2004
Location: Budapest, Hungary
The pushing forces will cancel each other - net result is zero force...
  Reply With Quote
Old 18th January 2012, 08:26 PM   #3
Lgrau is offline Lgrau  Denmark
diyAudio Member
Lgrau's Avatar
Join Date: Nov 2003
Location: Aalborg
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?
  Reply With Quote
Old 18th January 2012, 08:34 PM   #4
diyAudio Member
Join Date: May 2002
Location: oz
Have you tried corrugating the ribbon?
I have a large-ish ribbon 600x26mm with slight tension - no problems centering ..
george a
  Reply With Quote
Old 18th January 2012, 08:52 PM   #5
Lgrau is offline Lgrau  Denmark
diyAudio Member
Lgrau's Avatar
Join Date: Nov 2003
Location: Aalborg
it's to fragile to corrugate, just handling it without breaking the ribbon is difficult
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Krell Current Audio Signal Transmission C.A.S.T. - Current mode Technology = CMT tiefbassuebertr Solid State 7 7th April 2012 12:12 AM
Hall-effect current sensor for output stage over-current protection panson_hk Solid State 4 6th September 2011 03:07 PM
DIY ribbon info requested (constructing a ribbon unit) SpinMonster Planars & Exotics 15 11th April 2011 08:27 PM
Fountek ribbon tweeter 3cm2 ribbon black square alumunum faceplate lduarte1973 Multi-Way 3 16th June 2009 08:50 AM
no current mirror, current mirror, cascoded current mirror, bjt or jfet VAS? maxpou Solid State 31 17th June 2008 04:31 PM

New To Site? Need Help?

All times are GMT. The time now is 02:03 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2