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Old 11th March 2011, 10:28 PM   #121
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Have finished my rebuild of a push pull double membrane with 555 neo magnets 50 x 12.7 x 3 mm. To a single membrane using only 185 magnets per speaker using 23 micron mylar A polyester as opposed to 100 micron polythene. It was a complete success and the sensitivity was a little more and a lot lighter as well. I am quite happy with this design and I won't be building any more double membrane designs.
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Old 11th March 2011, 10:59 PM   #122
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Still can't send a picture, it says security token missing any idea how to get round this??
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Old 11th March 2011, 11:25 PM   #123
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by JAMESBOS View Post
Still can't send a picture, it says security token missing any idea how to get round this??
click on

go advanced

manage attachment

then you pick from your file

remember upload

if you have more than 3 pictures, just repeat the upload
some may need to be rezised
I rezise to 'large'
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Old 12th March 2011, 11:20 AM   #124
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Default latest rebuilds

These photos are my latest rebuilds
Attached Images
File Type: jpg SAM_0652.JPG (126.9 KB, 572 views)
File Type: jpg SAM_0653.JPG (184.0 KB, 504 views)
File Type: jpg SAM_0654.JPG (639.4 KB, 500 views)
File Type: jpg SAM_0655.JPG (325.3 KB, 445 views)
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Old 12th March 2011, 12:07 PM   #125
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Default New New Rebuilds

This is a rebuild of the first FRP I built over 20 years ago using ferrites and angle iron, weighed a ton. NOW I have to rebuild the membrane using the Mylar A Polyester Film, keeps me out of mischief!! The smaller one on the left I use for a sub woofer.I will also rebuild this one using the thinner membrane. I also have another like this using push pull design.This is also a future rebuild with the thinner membrane I will also remove the push pull design.
Attached Images
File Type: jpg SAM_0544.JPG (622.0 KB, 429 views)
File Type: jpg SAM_0517.jpg (508.1 KB, 98 views)
File Type: jpg SAM_0524.JPG (378.2 KB, 97 views)
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Old 16th March 2011, 12:36 AM   #126
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Default New Amp 7.1

Will be using 5 pairs of FRP of my own design and build, 1 pair of which will be sub woofers, with my new 7.1 ONKYO Amp. I just have to rebuild one of my sub woofers using the 23 Micron Mylar A.I have already rebuilt one which was a push pull design, which wasn't an improvement on the original single membrane design hence the several rebuilds. I shall have to cut several of the tapes in half using scissors. I have quite a few yards of material for covering of the speakers. The hardest part is using my sewing machine!!??
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Last edited by JAMESBOS; 16th March 2011 at 12:39 AM. Reason: adding.
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Old 16th March 2011, 12:42 AM   #127
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Default Security Token

With the help of my son I have sorted out this problem and I am now able to send pictures as well!!
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Old 16th March 2011, 03:38 AM   #128
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you could use this handy little device to test your field.
All you need is a signal generator which can be an amplifier and cd player playing a tone at very low level.

And a scope or digital voltmeter. jer

How to make a good transformer for ribbon tweeter?

p.s. I love the you tube video and I can definitely tell they have great sound even with the cheapy microphone. great job! jer

Last edited by geraldfryjr; 16th March 2011 at 03:41 AM.
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Old 16th April 2011, 04:08 PM   #129
R. Jamm is offline R. Jamm  United States
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Have you tried ribbon tweeters with your planar speakers?
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Old 17th April 2011, 12:33 AM   #130
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No need already full range, have enough work with the rebuilds., using the 23 um mylar A. Improving the design would need a total rethink. Which at this moment in time is beyond me.
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