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Old 18th July 2010, 11:02 AM   #41
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2 pieces of wood of the required size with a trapezoid cut out. Perforated steel sheet in between, then the magnets placed on either side of the sheet, 2 membranes with the aluminium tape placed over the gap between magnets. All joined up, Bob's your uncle.
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Old 18th July 2010, 09:19 PM   #42
a.wayne is offline a.wayne  United States
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Quote:
Originally Posted by tinitus View Post
hey wayne
just a small note
remember to have front and back magnet with N to N towards each other, and S to S
if you choose front/back N to S, then you will get sidewards movement instead

one advantage is that front and back magnets wont attrackt each other, thus wont clash together

though I doubt its simple
magnets do strange things
and the field may not behave as intended

before buying all those expencive magnets, I suggest to build a small model, to see how it behaves
and its very tricky to assemble
you can only handle one magnet at a time
do not try to make larger sections
those magnets are impossible to control in multiples
Trickey , huh ?

I was planing on having common polarity facing each other for a start using plates as oppose to perforated sheet as per James.

The Perf sheet would make for a easier go as a prototype. Standard ferrite magnets (domino style) are in expensive here 36.00 per 100 ....
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Old 18th July 2010, 10:43 PM   #43
tinitus is offline tinitus  Europe
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Originally Posted by a.wayne View Post
Trickey , huh ?
yeah, very

many years ago I made a big woofer planar using steel bars
about 5mm thick, and 25mm wide
I thought it would be strong enough to hold sidewards draft
Hell, those "weak" ceramics bent those steel bars sidewards like nothing
remedy was easy enough, just small pieces of wood here ad there did the trick

but it still tells how much power to handle
and those were ceramics
now its much stronger neos
I have been looking at neos for rubanoide, N42-N50 quality
I was shocked when I found that summed power lift fore each channel would be close to lifting a small car

just a note of caution


btw, honestly, I wouldnt dream of using a big planar for anything but the lowest bass
I have no idea how Jamesbos/Henry manage to do the impossible
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Old 19th July 2010, 07:01 PM   #44
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p/p frplanars - Imgur
The small one is the p/p full range planar , it's as loud as the big red one. Front and back views.
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Old 20th July 2010, 01:17 AM   #45
a.wayne is offline a.wayne  United States
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Thanks Henry .....
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Old 20th July 2010, 10:45 AM   #46
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having sorted out my first p/p frp I will be building a pair of p/p frp speakers using neo magnets size 50 x 12.7 x 3 mm. Then I will rebuild the 40 kilo black speakers covered in tube material, which have ferrites doubled up. So I can use the doubled up magnets for a p/p design. Should be louder for the same number of magnets and just one more piece of wood heavier. Just needs a slight re-design. Wish me luck!!
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Old 20th July 2010, 12:35 PM   #47
tinitus is offline tinitus  Europe
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Wish me luck!!
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Old 20th July 2010, 03:33 PM   #48
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Thank you.
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Old 27th July 2010, 10:46 PM   #49
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The wood has arrived using MDF for different thickness of magnets i.e. 6 mm wood for the 3mm neos,9 mm wood for the 6 mm neos and 15 mm wood for the 10 mm ferrites. Although 13 mm would be best for the 10 mm ferrites, but they don't sell this thickness. Have dismantled my21" x 24" speakers for the 3 mm neos, just need to cut the wood to size 600 mm x 400 mm and build the push pull full range planars 20 to 20k frequency. Then the same size using 6 mm neos. Then the doubled up ferrite ones covered in black tube material weighing about 40 kilos, will be rebuilt into my push pull design. This should keep me occupied for some time, should be very exciting and quite hard work for a 72 year old.
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Old 27th July 2010, 11:38 PM   #50
mavric is offline mavric  United States
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Jamesbos,
I have noticed that you have been working on this for three years now. I have read most of the post as it is over five pages long. Can you kindly post a pic of project? Your age has wisdom and I am interested in the view of what your creation looks like, aside from the cost,WOW, thats alot of money.
Kind regards, Mav.
is there any way you can provide any picture, please?
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