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Full range planar speaker using neo magnets
Full range planar speaker using neo magnets
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Old 18th October 2017, 06:20 PM   #391
WrineX is offline WrineX  Netherlands
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If you want it that cheap. Go to Alibaba but be sure to buy loads as James did. I am not aware of any webshop cheaper then the enes. Unless it is wholesale Alibaba
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Old 18th October 2017, 06:46 PM   #392
Samppo is offline Samppo  Finland
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I've used Magneticshop.it - Magneti in neodimio e ferrite online, vasta gamma di calamite e nastri magnetici | Magneticshop , quite good selection and decent prices.
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Old 7th November 2017, 11:15 AM   #393
JAMESBOS is offline JAMESBOS  England
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Wink neo magnets cheap

I bought all my neos from chinese company you can get any size but I used 50 x 12.7 x 3 mm, just the right size to use 3 3 mm tape on each magnet. I have stopped using neos now use ferrites size 40 x 30 x 10 mm from Enes magnets. I don't use mylar or any other plastic now too much trouble stretching and funny noises as well. I don't have to stretch or even glue my diaphragms, so you can try different layouts and glue the best one in position. Depending on the size of your speaker you can either use 3 or 5 mm tape for the required impedance. I have built ones from 3.5 ohms to 15 ohms which doesn't really matter as I use a DIY valve amp of about 7 amps which works with all the different impedance no problem. I use 2 volume controls so I can equalise the volume and test different builds on the 2 speakers. Have finally reached my best designs after many years of designing redesigning, changing materials , layouts etc.
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Old 7th November 2017, 12:55 PM   #394
Edmund is offline Edmund  Netherlands
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@HENRY
I have followed your experience here and I have got a quotation from a Chinese supplier unfortunately the prices are way higher then what you have paid. On the bright side, at least I can get all dimensions I want and I am aiming at around 6 mm wide. It all depends if I can make the conductor small enough, like 1 mm wide.
The metal plate will arrive this week and now I need material for the diaphragm and a place where to buy that, preferably in the Netherlands or Germany.
Suggestions are appreciated.
I do want neo magnets for the real thing since it gives more SPL and I do want my system to be able to play loud. Have to find out -probably the hard way- how to work with such strong magnets :-)
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Old 7th November 2017, 01:53 PM   #395
JAMESBOS is offline JAMESBOS  England
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Probably because I buy 2000 a time, although the price has increased over the last few months. Be very careful with neos, very powerful and they can jump quite a distance. Had a few near misses myself, and they are easily broken. I myself have stopped buying them myself. I use ferrite magnets now from Enes Magnets size 40 x 20 x 10 which are the cheapest size to buy although I usually buy 2000 a time. I don't use mylar or any plastics anymore. Too difficult and you get strange noises with plastic. Not easy to stretch that is why I gave up stretching. I have cut 100's of meters by hand with scissors. but I now buy 3 and 5 mm tape, depending on the size of the diaphragm to get the relevant impedance, although it doesn't matter all that much if you have 2 volume controls on your amp which I have on my DIY 7 amp valve amplifier, which works with impedance from 3.5 to 15 ohms with no problems whatsoever. Have built hundreds of speakers over the years!!
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Old 7th November 2017, 02:08 PM   #396
WrineX is offline WrineX  Netherlands
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Edmund depending on what you seek I might have the stuff

Mylar 3,6,12
Mylar/aluminium laminate

Who knows
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Old 7th November 2017, 02:22 PM   #397
DeltaStar is offline DeltaStar  Canada
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Has anyone tried that heat shrink film plastic used for storm windows? I found it worked quite well with diy electrostats.

Al
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Old 7th November 2017, 03:09 PM   #398
Edmund is offline Edmund  Netherlands
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@HENRY,
My quotation is for 1000 but the price way higher then what you mentioned a while ago.
Anyway first things first, jumping magnets... near misses....easily broken.. very encouraging :-) That is what I am afraid of, they must be glued and stay in place. I don't want the magnets touching each other the way you do it. Your design might be way easier but that way you use a lot of magnets and not much breathing space left.
You are not using Mylar anymore OK what material is your diaphragm?
Cutting 100's meter (alu) tape, yeah I have seen pictures of your work. I wanna use/try a more automated way of production. Impedance must end up somewhere between 3 and 9 ohm for SS amplifier use. I much prefer smaller conductor traces so I have to find out what is achievable.
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Old 7th November 2017, 03:43 PM   #399
wilbur-x is offline wilbur-x  Tibet
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Quote:
Originally Posted by DeltaStar View Post
Has anyone tried that heat shrink film plastic used for storm windows? I found it worked quite well with diy electrostats.

Al
I did, in the 80's during assembly of my version of "La folia" ,
The trapez-frame edges were rounded and the short end of trapez was formed as a half circle. The leftover trapez (cut-out) were used as underlay during attachment of the aluminium to the shrink film. No noise from edges were observed. Shrinking were easily done by a fan oven. Nail-snap to shrink-film proved (by ear) approx. the same tightening for both speakers.
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Old 7th November 2017, 03:50 PM   #400
Edmund is offline Edmund  Netherlands
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@WrineX
This build is testing mostly although I wouldn't complain if it will sound good.
Mylar-only will do just fine, I though of etching too but I see a lot of problems.
How much will a diaphragm stretch and how will that effect the conductor traces?
Must I first fix the diaphragm before etching?
How thick is a Alu layer on a Mylar/aluminium laminate, is it not too thin for small -1mm wide - conductor traces.
Mylar 12 um seems good to me.
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