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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 6th February 2018, 05:13 AM   #1181
OLEGsan is offline OLEGsan  Belarus
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Hi Sergiu2009.
I have not yet found another paper with fibers.
How should the fibers be arranged.
Parallel to the coil or perpendicular to the coil.
Eraser I use (from a fishing store) a fishing round with a diameter of 1mm.
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Old 6th February 2018, 10:21 AM   #1182
sergiu2009 is offline sergiu2009  Romania
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Perpendicular to the coil.
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Old 7th February 2018, 07:57 AM   #1183
OLEGsan is offline OLEGsan  Belarus
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Thank you, understood.
I will look for paper 120gr \ m with fibers.
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Old 8th February 2018, 08:27 PM   #1184
WrineX is offline WrineX  Netherlands
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Quote:
Originally Posted by OLEGsan View Post
Hello.
Made a membrane of paper Palazzo (for pastels) 160gr \ m 40% cotton.
It sounds a bit quieter than 120 gr / m usual white.
But the sound is much more interesting, cleaner.
Tried to find 120 gr \ m with cotton, until unsuccessfully.
I also make the lead wires from Litcendrat (15 conductors) in a silk shell.

Click the image to open in full size.

Click the image to open in full size.

sergiu2009 what filter did you do?
I cut Ruban only from below 500 Hz.
Ha nice i used this kind of paper to once, it is sort of ribbed, what i did what use the striped horizontal so it gives the whole thing bit more strength, that paper not sure what it was but looks a bit like this was the best i had, it came from an art store. it was light and rather rigid if you used it in that one direction only. rotate it 90 degrees and it was floppy
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Old 11th February 2018, 07:16 PM   #1185
borzi1024 is offline borzi1024  Hungary
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Default Resonance, distortion

Hi,

I step forward with resonance and distortion problem.
Both of my prototype diaphragm (Canson paper and Xerox never tear) had similar behavior.
Resonate one low freq, and there is a big distortion on that frequency and a multiplication of it.
After try several things without real success I read again the patent US4903308 and implement solutions mentioned there.
The Canson paper distortion almost disappear and Xerox (more floppy material) improves a lot.
The phenomena and one solution is clearly written in the patent, and the described solutions works for me.
Wrine implement similar strips earlier.
I tried also with foam tape it was not working, fiber glass works.
I made a video of Xerox vibration (around 37Hz):
YouTube

"The present transducer as best seen in FIG. 1 will
have a resonant frequency dependent on the specific
transducer size and the material employed.As shown in
FIGS. 1 and 5, parallel strips of damping tape 73 are
adhered at predetermined locations on the inside of
each web end portion 24a, 24b, 26a and 26b. The strips
of tape, preferably made of a woven fiberglass such as is
found in strapping tape, aids in flattening the amplitude
response and reduces harmonic distortion resulting
from the device’s resonant frequency and its multiples.
Best results have been obtained with a damping tape
mass of about g of the mass of the diaphragm 22, divided
into strips spaced equidistantly apart from near the end
of each web portion to the edge of the central dia
phragm expanse. While three parallel damping strips
are shown, it will be appreciated that an increased num
ber of parallel damping strips spaced equidistantly but
closer together also works well."

Other thing is the damping of "elastomeric cords":
"The length of cord on each side of the expanse as indicated
at 65 in FIG. 2 determines the low frequency below
which the frequency response of the diaphragm is atten
uated. Such attenuation is desirable because the lower
frequency response in a diaphragm has a greater ampli
tude and must be attenuated to improve the overall
response. It has been determined that a cord length of 1;
inch, with the cord fastened l inch away from each side
of the expanse, satisfactorily attenuates frequencies
below 100 Hz."
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File Type: jpg 20180210_122537.jpg (181.8 KB, 240 views)
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Old 12th February 2018, 04:27 PM   #1186
OLEGsan is offline OLEGsan  Belarus
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Hi borzi1024
What paper density did you use? (Video)
Than glued bands of fiberglass on the membrane?
Such long gum is better than V-shaped what did I use?
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Old 12th February 2018, 05:17 PM   #1187
borzi1024 is offline borzi1024  Hungary
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Hi Oleg,

Video shows Xerox never tear 125g/m2,
It is more flexible than 125g/m2 Canson paper.
The paper has similar vibration, Xerox more visible.
I do not think the long gum is better since it is supported quite close when it is working better. In the patent there is recommendation for lengths.
On picture you can see Canson paper with fiber glass tape and with foam supported gum.
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Old 12th February 2018, 05:53 PM   #1188
OLEGsan is offline OLEGsan  Belarus
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borzi1024
Than glued bands of fiberglass on the membrane?

I now also use paper 125g / m2 (FAVINI Crash)
But I limit the band to 500 Hz.
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Old 12th February 2018, 06:49 PM   #1189
borzi1024 is offline borzi1024  Hungary
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Above 500 Hz is not a big problem in my case.
Little bit more than 1% THD

Under 500 Hz it was horrible, see attached graph.

Would be nice to reach what is mentioned in patent: 150 Hz- 20k Hz flat freq response, under 1% THD in entire range.

It may sounds good.
Dipole radiation, holographic sound stage, like good ESLs or Mr. Linkwitz systems. (Orion, Pluto etc.)
Without investing a lot to good factory speakers or transformer for diy ESL.

It is too good to be true.
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File Type: png Distortion.png (113.8 KB, 223 views)
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Old 13th February 2018, 05:57 AM   #1190
OLEGsan is offline OLEGsan  Belarus
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I do not have a measuring microphone to take measurements.
At the ear very much like the sound.
On its 4-way system left only a 12-inch bass and a tape RF driver + Rubanoid. (The other speakers turned off)
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