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Old 16th September 2012, 01:32 AM   #21
paulfx is offline paulfx  United States
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Location: Cary, NC, USA
These nude pictures actually look better than the Duchess sunbathing.
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Old 27th September 2012, 05:05 PM   #22
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I have made a diaphragm myself.It messures not too good:
[IMG]Click the image to open in full size.[/IMG]
Blue is diy ,Red ESS.I have increased level 8-9 db. for diy model.
[IMG]Click the image to open in full size.[/IMG]
[IMG]Click the image to open in full size.[/IMG]
[IMG]Click the image to open in full size.[/IMG]
Sounds ok.
Bernt.
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Old 30th September 2012, 01:26 PM   #23
brunob is offline brunob  Germany
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Location: Erlangen, Germany
This is the first time I am seeing a home made AMT diagphram. This is not bad for a first try. My first one did measure awful and I abandoned it.

I think that you could improve the sensibility by using many more aluminium stripes since the magnetic field is present everywhere along the diagphrame.

Bruno
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Old 30th September 2012, 04:15 PM   #24
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The 3 stripe you see on the picture are 30 my and made for keeping membrame in shape and resonance damping.
[IMG]Click the image to open in full size.[/IMG]
This picture shows the "coil"

Bernt.
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Old 1st October 2012, 03:55 PM   #25
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I have been asked wich parts and material i used for my Diy AMT.
Diaphragm is from parts express:ESS Heil 1107 AMT-1 Replacement Tweeter Diaphragm 264-602Diaphragm messures :140x40x4mm.
Frame is a bit longer. I placed some rubber/foam in top and buttom.
Magnets are from Hyab in Sweden:HYAB Magneter: Block N36 70x10x6mm Ni - M5780 Neodym-magneter/BLOCK 70x10x6mm. neodynmium
Steel 10x10x143mm. Alternative angeled steel 15x15mm. or simmular.
Magnets have to be placed with correct polarity
I have a tread in a Danish site:http://www.hifi4all.dk/forum/forum_p...TID=94738&PN=1 Pleace note that there is two different models.
Pleace ask for further details.
Bernt.

Last edited by båndsei; 1st October 2012 at 04:11 PM.
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Old 2nd October 2012, 04:46 PM   #26
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Here is a drawing in femm.shoving magnet polarity:[IMG]Click the image to open in full size.[/IMG]

Bernt
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Old 3rd October 2012, 11:21 AM   #27
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Very nice bernt.

I have also made diy diaphragms, but you r work is much more professional than mine.

I used thin aluminium foil for the "coil" and two different thickness of mylar for the skin of the diaphragm, from memory it was 2 and 5 micron but i would have to check.

What material have you used for the coil and skin?

Nick

Then i bought a house and had a child so i never got to test them. I will one day.
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Old 3rd October 2012, 04:18 PM   #28
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I used alu/paper: alu 7my = 7/1000mm. and paper 10-20my.
"Skin" microporre tape.´
It is a quite hevy and performs not as i hoped,so i am trying with microwaveoven skin and alu foil.

Bernt.
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Old 7th October 2012, 01:13 PM   #29
RK1 is offline RK1
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Join Date: Sep 2012
perhaps it will be of topic - but:
- I'm not sure the distribution of magnets for the best EM field distribution
- I'm not sure whether this membrane system - magnets - is appropriate.
- Can see the design on this page www.dahlbergaudiodesign.se
(http://www.dahlbergaudiodesign.se/del1/del1.htm)
Have a nice day
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Old 8th October 2012, 07:35 AM   #30
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I have tried with soft skin,microwaveoven ,and it did not work:
[IMG]Click the image to open in full size.[/IMG]

It was too soft and the coil shorted as i messured it.
I have seen this magnetsystem before ,and i think it is only for ribbons.Thoug it could be used with a different magnet polarity.

Bernt
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