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Old 14th May 2017, 12:51 AM   #1
urmom is offline urmom  United States
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Default Ribbon headphone design

Hey there fellow DIYers I am designing some ribbon headphones and I'm looking for some feedback on my prototype design.
2017-05-13.png

My plan is to order some brackets shown in the above picture and slide in the magnets and the ribbon as shown but I'm stumped on how to adhere the ribbon and the input wires to the structure since solder and aluminum don't mix well together.

The magnets are 100x10x5mm and the ribbon is 100x50mm (4'' long, 0.4'' wide magnet / 4'' long, 2'' wide ribbon)
The ribbon is 4um.
The brackets will be made of aluminum.

The only way I see that I can uniformly adhere the ribbon to the bracket is with some sort of clamping mechanism, not sure how to approach that without adding twice as much aluminum and it's already pretty pricey at $100 for two of them without the clamp.

How much tension do I need to add to the ribbon when attaching?

Are there any flaws in my general approach?

Last edited by urmom; 14th May 2017 at 02:30 AM.
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Old 14th May 2017, 02:29 AM   #2
urmom is offline urmom  United States
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Here is an updated bracket with a clamping mechanism.
2017-05-13 (1).png
$150 for two, ouch.
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Old 14th May 2017, 02:59 AM   #3
jcx is offline jcx  United States
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Default some learning needed - look at commerical transducers for some clues

it looks like you won't have any efficiency - the wide magnet spacing will give very low B field over most of the "ribbon", which means almost no force to move the "ribbon"

true ribbon transducers have a very narrow magnet gap, narrow ribbon

"planar" transducers have lots of magnets in strips over the whole face of the diaphragm to give regions of high B field at the serpentine trace glued to the plastic membrane

Last edited by jcx; 14th May 2017 at 03:06 AM.
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Old 14th May 2017, 03:05 AM   #4
urmom is offline urmom  United States
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How narrow does the ribbon have to be? N52 neo magnets won't have a high flux density two inches apart?

Last edited by urmom; 14th May 2017 at 03:08 AM.
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Old 14th May 2017, 03:57 AM   #5
jcx is offline jcx  United States
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magnetic "circuit " design is complicated by the 3 dimensional nature of the fields

the leakage effects often dominate - a dipole has a cubic rate field falloff by distance

today we can use online calculators, even free Finite Element tools

a field calculator
https://www.dextermag.com/field-calc...for-rectangle/

a FEM solver https://www.supermagnete.de/eng/faq/...c-flux-density check the FEMM link.

search the planar threads here for examples of people using these tools

Last edited by jcx; 14th May 2017 at 04:01 AM.
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Old 14th May 2017, 06:15 AM   #6
urmom is offline urmom  United States
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Maybe something like this then?
2017-05-14 (1).png
Multiple 0.5'' width strips.
I gotta say I don't like it as much, it's not as elegant.
Are there pros/cons to using smaller strips vs a single big one other than efficiency?
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Old 14th May 2017, 07:07 AM   #7
jcx is offline jcx  United States
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Neo magnets did lead to a revival in Planar headphones - but they all have the many small magnets, serpentine conductor on a plastic membrane - the commercial designers aren't avoiding simpler, more elegant ribbon designs out of lack of imagination - the numbers just don't work, can't make enough SPL
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Old 14th May 2017, 10:56 AM   #8
urmom is offline urmom  United States
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Why choose planar over ribbon for headphones? Durability? Impedance? LF response? In theory ribbon should sound better shouldn't it? I read that ribbons in headphones should be able to provide good LF response.
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Old 14th May 2017, 12:08 PM   #9
urmom is offline urmom  United States
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Does the ribbon need to vertically centered between the magnets? I'm coming out at 4 inches across for four 0.5'' strips, the magnets are taking up a lot of space. When I look at some ribbon speakers I don't see magnets protruding so they must be positioned below the ribbon?
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Old 14th May 2017, 05:29 PM   #10
urmom is offline urmom  United States
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Okay here's the bracket with four 0.5'' wide ribbons
2017-05-14 (2).png
The middle hole is for lug attachment for the input wires.
Is there a benefit to placing ribbons on both the top and bottom sides of the bracket in parallel?
Would this create a sort of push pull configuration and increase power output?
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