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A DIY Ribbon Speaker of a different Kind
A DIY Ribbon Speaker of a different Kind
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Old 22nd February 2020, 02:48 AM   #1291
jerryrigged is offline jerryrigged  United States
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Peril, I believe your desire to use disc magnets will ultimately need a prototype.
FEMM can only work in two dimensions accurately.

I have had similar problems with the Walsh speakers that I have been working on.
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Old 22nd February 2020, 07:28 AM   #1292
båndsei is offline båndsei  Denmark
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I think the discs are magnetisized trugh "the depth".
If so,place the discs betwine iron bars as with square magnets.

sorry for my spelling ,hope you get the idea.

Bernt
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Old 22nd February 2020, 02:58 PM   #1293
peril is offline peril  Switzerland
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thanks you, for the answers. Intuitively, I think that the magnetic forces are evenly distributed on the iron. If the volume of the disc is equal to the volume of a square magnet
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Old 22nd February 2020, 03:07 PM   #1294
jerryrigged is offline jerryrigged  United States
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Default DIY-ing into the Void of Happy Happenstance....

bandsei, that was my thought about those magnets....it'd make sense that they'd be polarized in that axis. First reaction was they're out of old hard drives. SOP for DIY...I'm guilty as well. *G*

If that was the case, they'd be strong but one would need a bunch of them. Placed between bars, you'd get a lot of 'field strength', but it's a 'guesstimate' whether or not the field would be 'consistent' in shape. *?*head scratch*

Ergo, my comment on 'lobe-ing'; perhaps if that occurred there may be a hidden positive result. The space between the magnet assemblies in relation to the driven coil plane may benefit in being adjustable to explore that potential...

The Radia link seems to be aimed at a crowd that 'if it's not SOTA/'bleeding edge' research related, don't bother us...IMHO....

I'd explore making a 'test rig' where one could 'swap out' magnet structures with a 'given' radiator structure. But that would only be perhaps useful for a
'conventional' rubanoide design....

For a Manger DIY unit....I've no clue as to an approach, as I've not been drawn to copy one.

I have my own Quixotic Quest...
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Old 22nd February 2020, 03:11 PM   #1295
jerryrigged is offline jerryrigged  United States
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peril, that may be the case. *S* Intuition is the soul of DIY.

I hope this is true for you. The field may 'average out' in your application.

Good luck, and let us know what you encounter....*S*
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Old 22nd February 2020, 03:37 PM   #1296
jerryrigged is offline jerryrigged  United States
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Default An intriguing thought....

...perhaps....

Most rubanoides I've seen (not heard) tend to be 'full range' drivers...except for, of course, 'deep bass' into subwoofers....

Now, this has struck me as a common occurrence with planar type drivers.

Magnaplanars have a separate HF 'area', if not a 'stand-alone' driver....and the bulk of 'FR' speakers have similar 'HF issues'....

I wonder if a 'Small+Large' rubanoide arrangement would yield more 'even' response overall? I've found that the case with my Walsh drivers; it was noted in comments on the original Ohms units. The current Ohm speakers seem to address this with separate tweeters within the 'basket' atop the main drivers.

Hence, the 'toe-in'/Left & Right speaker designations their pairs come in...

I'm trying to get around and over that....

"One Driver to Rule Them All", borrowing and paraphrasing TLOTR 'hardware' . *L*

Any thoughts on that? Just curious....
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Old 23rd February 2020, 01:32 PM   #1297
wlowes is offline wlowes  Canada
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What is the current range you are getting. Is range from 100Hz to 12k possible?
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Old 23rd February 2020, 03:59 PM   #1298
peril is offline peril  Switzerland
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Shared album - Albert Schweitzer - Google Photos

Shared album - Albert Schweitzer - Google Photos
Upload images with URL?
My Rubanoid should only work around 300-400Hz. I'm only interested in the bending waves. Bending shafts have their advantages in the mid-high range.
If the images are visible, this was just a quick, quick experiment with a glued broadband chassis.
regards
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Old 28th February 2020, 05:08 PM   #1299
peril is offline peril  Switzerland
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Shared album - Albert Schweitzer - Google Photos

According to the theory of bending wave propagation, a tough elastic material is ideal.

On the drawing you can see an experiment that everyone can do with a sheet of paper. The semicircular membrane makes a lateral movement at the end of the membrane.
The membrane attached to the center towards the end makes no visible lateral movement. I think this is advantageous.
Maybe someone disagrees?
Unfortunately I have to stop the Ruba project because I am forced to demolish my workshop. I illegally built 12 square meters 13 years ago. now the authority has discovered this. ****
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