Anyone have tried curved or even almost cylindrical magnetostatic speaker? Rubber neodymium magnets are made up to N8 grade, price is similar to sintered but grade almost five times weaker. Typical thickness is 2 or 5mm, for multipole pitch is 5mm.
Second thing is how efficient (smooth SPL) is asymmetric motor like this one below.
Second thing is how efficient (smooth SPL) is asymmetric motor like this one below.
Attachments
Are you able to download more than one page from cited document? It looks like an omnidirectional ribbon horn loaded - clever!
We need to know which motor is better - multipoled or monopoled and what kind of cavities (holes) are optimal. Push-pull seems to be a must for low grade magnets. I'm thinking about long flexible magnet 50mm*1000mm*5mm, N8, 70$, Xiamen China, rest of the membrane passive, ~20cm cylindrical speaker = good WAF.
We need to know which motor is better - multipoled or monopoled and what kind of cavities (holes) are optimal. Push-pull seems to be a must for low grade magnets. I'm thinking about long flexible magnet 50mm*1000mm*5mm, N8, 70$, Xiamen China, rest of the membrane passive, ~20cm cylindrical speaker = good WAF.
No, it's one page at a time I think, to stop people scouring their website for everything, and presumably thereby to limit traffic demands.
Back to the invention - yes it is clever. I thought I had something unique in mind until I saw this. I've been doing a few very crude experiments, and the basic concept is promising. My goal was/is to achieve a better high frequency dispersion than speakers like my Magnepans manage. This certainly seems to be achievable, but needs better design to improve the efficiency.
I'm on the verge of ordering Neodymium magnets, and have some ideas about construction that I might share here if I do any more construction work, and there is interest from the forum. Until then it's just speculation on my part 🙂
Ed
Back to the invention - yes it is clever. I thought I had something unique in mind until I saw this. I've been doing a few very crude experiments, and the basic concept is promising. My goal was/is to achieve a better high frequency dispersion than speakers like my Magnepans manage. This certainly seems to be achievable, but needs better design to improve the efficiency.
I'm on the verge of ordering Neodymium magnets, and have some ideas about construction that I might share here if I do any more construction work, and there is interest from the forum. Until then it's just speculation on my part 🙂
Ed
I can't find foil metallisation just below 1um. Normally it is in nanometer range. From the other side aluminium foil with adhesive is heavy - 30um. First experiments tells me it's better to have controlled path of current flowing in magnetic field. Plain foil with several ohms of impedance was inefficient in my case. Am I right?
Well there are many ways to make this work. One is to make a version of a ribbon source. This requires high current in an intense magnetic field (see some of the threads on full range ribbons for typical magnet structures). Usually, the ribbon is a very low impedance, and employs a step down transformer to match this load to what a typical amplifier can drive.
Then there is the Magnepan approach, with wire bonded to a thin diaphragm. The advantage here was that lots of wire could be distributed over a large area of panel, with wires making multiple circuits through some sections of the field, as necessary.
I have considered both methods.
Ed
Then there is the Magnepan approach, with wire bonded to a thin diaphragm. The advantage here was that lots of wire could be distributed over a large area of panel, with wires making multiple circuits through some sections of the field, as necessary.
I have considered both methods.
Ed
Hello,
jzagaja, try this please:
www.depatisnet.de
> Recherche
> Einsteiger
> Veröffentlichungtsnummer (DE3614313, split DE)
> Recherche starten
> Anzeige PDF
> press ESC
> 300dpi
> ESC
> copy the Patent number in the top right, if needed
> Volldokument laden
> fill in the code field (Verifikation Zeichenkette)
> store the document (using the copied number, is desired).
Regards, Timo
jzagaja, try this please:
www.depatisnet.de
> Recherche
> Einsteiger
> Veröffentlichungtsnummer (DE3614313, split DE)
> Recherche starten
> Anzeige PDF
> press ESC
> 300dpi
> ESC
> copy the Patent number in the top right, if needed
> Volldokument laden
> fill in the code field (Verifikation Zeichenkette)
> store the document (using the copied number, is desired).
Regards, Timo
Thanks a lot Tiki! Anyone talked with Dr.-Ing. Nüsslein Günter about commercial application of his patent? He has Ingenieurbüro in Wedel (Schleswig-Holstein), Telefon: +49 04103/5633.
http://www.hifi4all.dk/forum/forum_posts.asp?TID=67356&PN=1&TPN=1
Try to look at this Danish site, there is a lot of pictures,but some of the ideas have not been used.The best result was when i taped 10 aluribbon to a planar membrane and fastened it to the frame.My English is not too good, and it is difficult too explain it eveen in my own languege.
Try to look at this Danish site, there is a lot of pictures,but some of the ideas have not been used.The best result was when i taped 10 aluribbon to a planar membrane and fastened it to the frame.My English is not too good, and it is difficult too explain it eveen in my own languege.
Båndsei
Excellent, that's a real DIY! I see both long ribbon array and planars on the last page. Tell us few words eg. foil type, conductor thickness, how low it goes, how loud and maybe some measurements?
Ms. Chen from Xiamen is willing to send me rubber neodymium samples in January.
Excellent, that's a real DIY! I see both long ribbon array and planars on the last page. Tell us few words eg. foil type, conductor thickness, how low it goes, how loud and maybe some measurements?
Ms. Chen from Xiamen is willing to send me rubber neodymium samples in January.
My diaphram messures 120x980mm. and is made of alufolie witch paper in DK. it is used to ¨store food in.Thickness of alu is 0.007mm. + the paper.I cut it into coils of 8mm.wide. I use 11 meters to make a diaphram and the Resistance is 5 ohm.The tape is from 3M called microporre and for helth care.I cut it to coils of 3mm. wide.
Hi there Båndsei,
Has 3m Microporre adhesive on both sides? I think we can coat it with conductive glue 0.01 Ohm per cm can we?
Has 3m Microporre adhesive on both sides? I think we can coat it with conductive glue 0.01 Ohm per cm can we?
Hi båndsei
That really is some very nice design work and high quality construction. What frequency coverage is typical from these devices? Also, how is the polar dispersion in comparison to a flat panel?
Thank for sharing this project with us,
Cheers
Ed
That really is some very nice design work and high quality construction. What frequency coverage is typical from these devices? Also, how is the polar dispersion in comparison to a flat panel?
Thank for sharing this project with us,
Cheers
Ed
My curved planarspeaker has not been tested,but i think it goes from 150 hz to 18000 hz. maybe 20000 hz.I will try to build a new one 21x80 cm. and try to curve it horisontal too.To curve it horisontally,i dont get the "hot spot".
Awesome! Are you using shellac veneer? If it could goes down to 50Hz 🙄, imagine completely curved magnetostat in which back wave is transmitted through tapered quarter wave waveguide and every part is steerable so that you can change directivity if necessary.
Roger Sanders , say's to stay away from curved Panels ....😀
http://www.youtube.com/watch?v=Vdf3VA06iSA&feature=related
http://www.youtube.com/watch?v=Vdf3VA06iSA&feature=related
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