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Old 12th October 2008, 08:16 PM   #21
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[]N-----------S[]S-----------N[]



The brackets represent the 3 flat pole pieces.
Hope this helps.
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Old 12th October 2008, 08:19 PM   #22
jzagaja is offline jzagaja  Poland
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setmenu

Have you used a laminate for printed circuit boards (PCB)? How one can make it so thin?
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Old 12th October 2008, 08:28 PM   #23
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It's was an Espanex flexi circuit material i used for the ribbon.


http://www.nscc.co.jp/english/materials/index.html
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Old 12th October 2008, 08:47 PM   #24
jzagaja is offline jzagaja  Poland
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Is FCC laminate expensive? It's what I was looking for.
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Old 12th October 2008, 08:56 PM   #25
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I has been a number of years now, so not sure, but the key is finding somewhere that will sell you exactly what you want in tiny amounts [say 1 meter square] rather than 100 meter rolls for thousands of dollars!

Good luck searching it out!
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Old 12th October 2008, 08:56 PM   #26
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I was thinking of using the following:
http://www2.dupont.com/Kapton/en_US/.../FN/index.html

25 micron Kapton + 5 micron aluminum foil should make a decent enough ribbon.

Quote:
Originally posted by setmenu
[]N-----------S[]S-----------N[]



The brackets represent the 3 flat pole pieces.
Hope this helps.
Don't the magnets push each other apart?
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Old 12th October 2008, 09:10 PM   #27
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Quote:
Originally posted by Spasticteapot
I was thinking of using the following:
http://www2.dupont.com/Kapton/en_US/.../FN/index.html

25 micron Kapton + 5 micron aluminum foil should make a decent enough ribbon.



Don't the magnets push each other apart?

try looking for AC 121200EM : http://www2.dupont.com/Pyralux/en_US...ad_H-73247.pdf

http://www2.dupont.com/Pyralux/en_US...nfo/index.html

It was Dupont stuff i started with.

No the magnets don't repel if you have sufficient mass of pole piece.
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Old 12th October 2008, 09:24 PM   #28
jzagaja is offline jzagaja  Poland
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Setmenu

Your headphone looks superb but how does it measure?
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Old 12th October 2008, 09:36 PM   #29
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Ooh, nice - 24 microns thick with copper! Aluminum would be preferable due to reduced mass, but it's hard to argue with the convenience.
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Old 13th October 2008, 01:52 AM   #30
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I just had a bit of an idea: Since headphones require so little power, what if a huge stack of resistors were placed in series with "straight" ribbons along with an impedance compensation network? This would be massively inefficient - by my math, a headphone transducer composed of six 1/4" x 4" ribbons wired in series would result in 0.2 ohms DC. If wired in series with a further 3.8 ohms of impedance, about 5% of the amplifiers' power would actually go to the headphones, allowing an ordinary audio amplifier (20WPC+) to drive them with ease.

Please see attached picture to see what I'm thinking of.
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File Type: jpg 168_earspeaker_02.jpg (38.6 KB, 527 views)
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