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Design Consult on Headphones - Page 2

post #16 of 24
7/6/11 at 7:03pm
Quote:
Originally Posted by Steve Eddy View Post

Can you explain how that could possibly be the case without the diaphragm being connected to something to keep it stable?

 

se

 


the diaphgram is connected at the edges like an electrostatic and under tension. 

 

Re-reading what I wrote, the therum does apply, it will always apply in cases of opposing magnetic forces, it just wont be the undoing of this idea. 

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post #17 of 24
7/6/11 at 7:06pm
Quote:
Originally Posted by ffdpmaggot View Post

Well in layman's terms, what makes it impossible for a static dmagnetic system to create levitation?



I'll defer you to the prevailing wisdom on answering hard questions about magnets.

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post #18 of 24
7/6/11 at 7:39pm
Quote:
Originally Posted by nikongod View Post

 

 

 

 

 

DSC_1840.JPG

 

Opinions?


Very cool. Not a great deal different from the 800's driver.

 

 

 

To the OP, why don't you consider coating your mylar film with a metallic substance, and electrically charging it, then controlling the movement with two cage-like stators on either side, each of which will be oppositely changed and alternating.

 

 

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post #19 of 24
7/6/11 at 11:26pm
Quote:
Originally Posted by nikongod View Post

the diaphgram is connected at the edges like an electrostatic and under tension. 

 

Re-reading what I wrote, the therum does apply, it will always apply in cases of opposing magnetic forces, it just wont be the undoing of this idea.
 

 

Well, as I understand it, his idea is to have the diaphragm "suspended in the air by magnetism." You know, like the frog in the diamagnetism demonstration video.

 

 

se

 

 

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post #20 of 24
7/6/11 at 11:30pm
Quote:
Originally Posted by digger945 View Post


To the OP, why don't you consider coating your mylar film with a metallic substance, and electrically charging it, then controlling the movement with two cage-like stators on either side, each of which will be oppositely changed and alternating.

 

 

Or use an electret film in which case you don't have to charge it.

 

se

 


 

 

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post #21 of 24
7/7/11 at 7:25am
Thread Starter 

I'm not keen on the idea of doing DIY electrostats, my understanding is that DIY electrostats typically turn out to be trebly and thin sounding. Bassy with the highest frequencies cut off would sound like a better deal to me.

 

Anyway, deferring back to the moving mass, would it make a difference that as the moving mass goes up, the driver responds (hypothetically) faster to the effects of the electromagnet? If the diaphragm is suspended at equilibrium with a magnetic push of 20 pounds, shouldn't it move with more force than a diaphragm suspended at equilibrium with 5 pounds? I would expect this would overcome the high moving mass at high frequencies. I believe I have found a damper that could be used to suspend the driver. If the concept of a higher weight for the magnet, equating to more force to push the driver back and forth, doesn't sound viable, then I'll just nix the idea. Also, I can work out a way to attach the driver to something stable, but I like the concept of using strong opposing magnets as dampers, if this is viable.

 

As for the levitating frog, how did they get it to do that in the first place?


Edited by ffdpmaggot - 7/7/11 at 7:30am
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post #22 of 24
7/7/11 at 9:01am
Quote:
Originally Posted by ffdpmaggot View Post
As for the levitating frog, how did they get it to do that in the first place?


Diamagnetism.

 

Diamagnetic materials respond to external magnetic fields with their own field of the same polarity, so it's repulsed by the external field. Water is slightly diamagnetic. Frogs are made mostly of water. So if you put one into a tube with a strong enough magnetic field, it will float in the middle of the tube.

 

se

 

 

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post #23 of 24
7/7/11 at 10:15am

Yeah, suspending the diaphragm with even the smallest amount of perceived control would be pretty much impossible. Now, I suppose technically if the stator was suspended and in constant rotation it could stabilize, but really...why? you won't end up with anything that can be easily put on your head, and the sheer amount of power needed would be astronomical. The fields would need to be powerful enough that I wouldn't want to put it on my head for any prolonged period of time.

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post #24 of 24
7/7/11 at 10:55am
Thread Starter 

Well I suppose I'll need to make something more electrostat like in nature. Steve Eddy recommended electret film. As for the matter of stators, I'm not big on the idea of putting a screen of any sort between the diaphragm and the ear. Could I use a ring electromagnet attached to either end of the housing and just attach the electret film to the housing itself?

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