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Old 24th March 2012, 08:59 PM   #11
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Location: Spain
Impressive!
Please go on
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A cold amp is a sad amp... I like them warm at least
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Old 25th March 2012, 06:05 PM   #12
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My next move is to make the unit 80mm. longer,8 more magnets,and find a better way to mount the ribbons at the ends.
[IMG]Click the image to open in full size.[/IMG]
[IMG]Click the image to open in full size.[/IMG]
The "tape"/ribbon is app 85cm. and will be app 120cm. in the next version.
[IMG]Click the image to open in full size.[/IMG

Bernt
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Old 23rd April 2012, 07:25 PM   #13
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[IMG]Click the image to open in full size.[/IMG]
This one has longer ribbons and a bit wider (21mm.).
I have to make 3 conductors to get app. 4-6 ohms.
[IMG]Click the image to open in full size.[/IMG]
Bernt "Båndsei"

Last edited by båndsei; 23rd April 2012 at 07:27 PM. Reason: More pics.
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Old 29th April 2012, 08:33 AM   #14
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[IMG]Click the image to open in full size.[/IMG]
Now in action.
Sensivity a bit lower than the Aurasound they are replacing.
Sounds nice,crossoverfreqens changed to 1500hz.

Bernt "Båndsei"
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Old 29th April 2012, 08:45 AM   #15
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Impressive
I have no words.

More pics, please!
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Old 29th April 2012, 06:16 PM   #16
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Location: South Wales, U.K
Are those 'Neo' magnets you're using ?
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Old 29th April 2012, 06:27 PM   #17
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Yes ,6x10x70mm.
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Old 8th May 2012, 09:36 PM   #18
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What did you use for the ribbon material on this last build?
It looks quite good for the job, as the pressed circles appear to give 'reinforcement' to the suspended strip..
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Old 9th May 2012, 04:34 AM   #19
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Location: MA
Quote:
Originally Posted by båndsei View Post
[IMG]Click the image to open in full size.[/IMG]
Now in action.
Sensivity a bit lower than the Aurasound they are replacing.
Sounds nice,crossoverfreqens changed to 1500hz.

Bernt "Båndsei"
You might want to consider adding a half sphere or perhaps a egg / bullet shaped diffusor at the bottom of your ribbon module to improve dispersion of the woofer at the upper end of its frequency range (like the Hegeman H1) That is a great job you did on your ribbon module. I'd love to hear the finished unit. Back in the late 70's I built an experimental cylindrical tweeter along the lines of yours except while yours uses true ribbons the one I built was a planar diaphram with vertically oriented conductors on a thin plastic film. Around the (cylindrical) magnet assembly was a thin sheet of open cell foam. The plastic filmwith the conductors was wrapped around the foam. When a positive polarity signal was applied to the conductor the whole diaphragm moved outward (expanding in you will). With the negative signal it moved inward (contracted). It was low efficiency and I wondered about how linear the expansion vs the contraction of the diaphragm was with the same level signals (due to the effects of the thin foam, the elasticity of the film diaphragm and the the diaphragm being mounted in front of the magnet structure is was really a single ended design). I never did too much with the tweeter after the initial experiments. My plan (if it had worked) was to use it to improve the high end of some Ohm G speakers (they look like a short version of the Ohm F....no paper section). Best of luck with your design!
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Old 10th May 2012, 06:58 AM   #20
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[IMG]Click the image to open in full size.[/IMG]
I use my favorite material alu/paper and i keep the paper.Alu is 7my.I am going to use a konusshaped difusor.

Bernt.
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