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Old 20th December 2012, 11:23 PM   #101
ilardi is offline ilardi  United States
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How fine a pitch line do you need? You can go pretty fine with an inkjet printer and photoresist. I have not tried it but I think I have heard that 5 mils is doable.
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Old 21st December 2012, 10:14 AM   #102
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I expect the relative error to be greatest in the folding, which it seems is always by hand, so the pitch shouldn't be a real issue. I think that planars require a finer pitched trace since it needs to be artificially lengthened for high enough ohms.

Try the IDE cable method that I mentioned for a quick test, you can draw by hand with rather nice precision.
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Old 9th January 2013, 04:01 PM   #103
WrineX is online now WrineX  Netherlands
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wow , this all looks great, really got my hands itching. i might look for some neo's to!
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Old 9th January 2013, 04:46 PM   #104
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I am posting in this forum too:HIFI4ALL Forum: Diy AMT
Here my latest
[IMG]Click the image to open in full size.[/IMG]
And messurements too.
[IMG]Click the image to open in full size.[/IMG]
Green is DIY Blue is ESS Heil amt.

Bernt
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Old 9th January 2013, 06:05 PM   #105
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Wow you must be very pleased with yourself. I haven't had a chance to make a diaphragm yet because of my urgent thesis completion, but I have messed around with folding test sheets using cable ties to space the pleats.

Can you share any tips for cutting the aluminium without tears? What is your preferred method? Using water to make it stick to paper seems to help but perhaps there's a better way.
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Old 10th January 2013, 09:29 AM   #106
WrineX is online now WrineX  Netherlands
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looks stunning, bot in real life photo and on the measurement, you made a better one then the original
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Old 10th January 2013, 09:33 AM   #107
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Quote:
Originally Posted by båndsei View Post
I am posting in this forum too:HIFI4ALL Forum: Diy AMT
Here my latest

And messurements too.

Green is DIY

Blue is ESS Heil amt.

Bernt
Great work!

Green FR looks good and promising!

My goal is F3 around 300 Hz. If it is achievable with ribbon then it must be achievable with AMT. But longer one.

What are your listening impressions comparing to original AMT?
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Old 10th January 2013, 11:48 AM   #108
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A long AMT is an attractive possibility, since it could be pretty narrow then. Less folds to make but each would be a bit tougher to complete.
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Old 10th January 2013, 06:40 PM   #109
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Yesterday i was a happy man,mesurements where stunning.
Today...
[IMG]Click the image to open in full size.[/IMG]
Red is ESS, blue diy.
Yesteday I mesured at 10cm. distance.
Today at 40cm distance as i usual do,and with a 40cmvide baffel.
Any comments?
I could make a longer AMT,but have to make new tools.

Bernt
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Old 11th January 2013, 06:06 AM   #110
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For the ESS it says 'horn' - is there really a horn or just the same baffle?
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