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Old 11th October 2012, 06:36 PM   #1
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Default diy planar speaker diaphram question

can this material be used as a diaphram for my planar project? Black Chrome Automotive Films - Tinted automotive window film for cars, trucks - Black Chrome - 3M US . thanks for any advice in advance.
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Old 11th October 2012, 08:36 PM   #2
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the best material to use is 12 um mylar c, that is what I use now, after trying rubbish bags and various different thick materials from 100 um down to 6 um. I have built and rebuilt over 60 planars using neos and ferrites. From A4 size up to 7' x 2'. I have hopefully finally reached my design goal.
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Old 15th October 2012, 06:32 AM   #3
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I use Cellofan and a heatpistol to straight it out. And its cheap. Thomas.
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Old 15th October 2012, 06:35 AM   #4
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Picture off Cellofan mylar.
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Old 23rd October 2012, 01:18 AM   #5
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Thomas,
What is cellofan? never heard of it here in the states
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Old 23rd October 2012, 06:40 AM   #6
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Cellophan is used to wrap flowers, giftbaskets, cockies among other things.
Its a clear film that I taught was some sort of plastic initialy, but actually its made from cellulose!
It's more "brittle" compared to Mylar, but its easy to get hold of and cheap so for initial testing of principals - go for it!
If you want a stable long lasting speaker - get some Hostaphan or Mylar!

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Old 23rd October 2012, 09:34 AM   #7
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You can use Monokote as well.
But use the thinnest stuff you can get.
I have used (Super) ultra kote as it was the thinnest I could find at about a little less than a 1mil.

It works great for a quick panel.

Although using a thicker material will get you a good tension it also raises the resonate frequency of the diaphragm.

This won't be to much of an issue on a large panel.

Once it is bonded to the frame you can also remove the glue layer by washing it with some acetone.
This won't do a whole lot but it does help to reduce the mass of the diaphragm for the higher frequency's.

But, Yes, .5mil to .25mil or so mylar is the best for high frequency's.

jer
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Old 23rd October 2012, 12:48 PM   #8
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I do not have the right tool to messure cellofan. I whis a micrometer skrue for chrismas ! When i use a heatgun it must be thinner ? thomas.
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Old 23rd October 2012, 01:32 PM   #9
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Try folding or stacking 10 layers of the film and then measure with the slide micrometer you have.
Divide measurement by 10 to get thickness of film.
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Old 23rd October 2012, 03:34 PM   #10
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YES, ofcurse, how clever ! it that way it messures 0,205 and it gives 0,02 mm. + a litle bit of air. Thomas.
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