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Old 7th December 2005, 03:10 PM   #1
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Join Date: Mar 2005
Location: copenhagen
Default Diy ribbon

Her is a link too my diy ribbon
http://www.soundimage.dk/

Andre´ Jensen
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Old 8th December 2005, 12:36 AM   #2
dhenryp is offline dhenryp  United States
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Location: Mass.
Looks very nicely done! How about some details?
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Old 8th December 2005, 08:32 PM   #3
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Join Date: Mar 2005
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it is 150cm long and 2cm wide.The aluminium is 4 my glued to 15 my paper.It is korugaited along the 150cm not on the 2 cm.And then it is closed ind the sides.crossover point 200hz.

Andre´ Jensen
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Old 22nd January 2006, 05:46 PM   #4
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Join Date: Mar 2005
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her is a closer look at the ribbon
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Old 23rd January 2006, 10:39 AM   #5
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Join Date: Jun 2005
Location: Neuss, Germany
Default DIY Ribbon

Finished my first DIY Ribbon - look under "Lautsprecher" at www.michaelgaedtke.de
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Old 23rd January 2006, 12:57 PM   #6
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Very nice looking link there michael along with clear pictures...
i wish i could understand german...
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Old 12th February 2006, 01:25 PM   #7
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Join Date: Jun 2005
Location: Neuss, Germany
Default DIY Ribbon Part I

Here comes the missing part I of my DIY Ribbon article - look at "Ribbon I" under "Lautsprecher" at http://www.michaelgaedtke.de/.
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Old 24th February 2006, 06:09 PM   #8
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Join Date: Jun 2005
Location: Neuss, Germany
Default Transformer for Ribbon-Speakers

Here I show how I constructed transformers for my ribbons:

http://www.michaelgaedtke.de/Ribbon_3.htm
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Old 3rd March 2006, 08:22 AM   #9
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Join Date: Jun 2005
Location: Neuss, Germany
Default Magnetic field strength

Hello again,
from a friend I borrowed a gaussmeter which measures the strength of magnetic fields with a probe small enough to be positioned in the gap of my ribbon speakers. Here are my findings: Fortunately the field is

a) highly concentrated in the gap

b) linear across the length of the gap; linear part begins after half of first magnet block (some 10 mm) so that total homogeneous field ist just one neodym block shorter than magnet row (9 out of 10)

c) as far as the old gauge is correct field is strong at some 0,5 Tesla (5000 Gauss) in the middle of a 12 mm wide gap between double rows of magnets - see foto.

By the way: I also tested if the field is influenced by the addition of iron pieces across the ends of the frame to close the magnetic flux in the rear of the ribbon. Varnhagen seems to be right in his finding that this doesn't make much of a difference in efficiency - I could hardly see a deflection of the meter pin.
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Old 21st March 2006, 12:23 PM   #10
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Click the image to open in full size.

Click the image to open in full size.

This is my new ribbon. 150 cm long, 2 cm wide
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