Magnetic suspension for Cd player

peranders · 6th February 2004, 10:13 AM

http://www.kedab.se/Intro%20Index_fi...onProjects.htm

I stumbled across this by misstake. Magnetic suspension for a CD player.

elperopu · 6th February 2004, 02:20 PM

wow!

Lovan · 7th February 2004, 04:37 AM

If my eyes are not mistaken, I think it´s only using magnetics as vertical suspension. Looks like it uses some kind of guidelines so it won´t "fall" of.
I think there are better ways than magnetics anyway

Prune · 7th February 2004, 05:08 AM

This tends to come up again and again.
Of course it has guidelines. Earnshaw's theorem: it is not possible to achieve static levitation using any combination of fixed magnets and electric charges.
So, you either need an active system (i.e. the levitating spinning top or electromagnet with feedback system), quantum effects (i.e. an object put on a table levitates a tiny amount over it instead of passing through the table), or diamagnetic levitation (the only practical way to get sufficient effect is to use a superconductor as the diamagnetic material).
Finally, magnetic levitation won't prevent, and worse, won't damp any vibrations from the air (sound).
Do vibration isolation the way it's done in labs -- I've seen a confocal (laser scanning) microscope setup using a heavy marble base, lots of sand, and pneumatic dampers.

Faber · 7th February 2004, 10:52 AM

something similar it the Relaxa-1 table. You can find some review http://www.tnt-audio.com/accessories/relaxa1_e.html

Peter Daniel · 7th February 2004, 09:24 PM

What strikes me about this design is that black plastic cover is flush with aluminum block. If this is the case, handling CD is very difficult as there is not enough clearance for the fingers to get hold of the edge of the disk.

Otherwise seems like an interesting approach.

karma · 7th February 2004, 10:58 PM

yes it would be but it looks nice

jleaman · 7th February 2004, 11:29 PM

what about the cd's being a little of centered and wobbleing and or the bottem getting scratched..

tiroth · 7th February 2004, 11:32 PM

If the CD is wobbling that much you'll have big problems regardless.

Peter Daniel · 7th February 2004, 11:45 PM

As long as aluminum part is not higher than the plastic lens protecting cover, the CD has no way to touch anything, unless of course you were using it for other purposes previously

6th February 2004, 10:13 AM	#1
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	Magnetic suspension for Cd player http://www.kedab.se/Intro%20Index_fi...onProjects.htm I stumbled across this by misstake. Magnetic suspension for a CD player. __________________ /Per-Anders (my first name) or P-A as my friends call me

7th February 2004, 10:52 AM	#5
Faber diyAudio Member Join Date: Jun 2002 Location: East side of Milano	something similar it the Relaxa-1 table. You can find some review http://www.tnt-audio.com/accessories/relaxa1_e.html __________________ Fabrizio

7th February 2004, 11:29 PM	#8
jleaman diyAudio Member Join Date: Apr 2002 Location: Nanaimo	what about the cd's being a little of centered and wobbleing and or the bottem getting scratched.. __________________ Baby Danika, Born January 20th 1:54am.. http://itsparks.dyndns.orgMix a LittleUntangle&Opendns.org Perfect..

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6th February 2004, 02:20 PM	#2
elperopu diyAudio Member Join Date: Jan 2004 Location: TN	wow!

7th February 2004, 04:37 AM	#3
Lovan diyAudio Member Join Date: Oct 2003 Location: Sweden	If my eyes are not mistaken, I think it´s only using magnetics as vertical suspension. Looks like it uses some kind of guidelines so it won´t "fall" of. I think there are better ways than magnetics anyway

7th February 2004, 05:08 AM	#4
Prune Account Disabled Join Date: Mar 2003 Location: Vancouver	This tends to come up again and again. Of course it has guidelines. Earnshaw's theorem: it is not possible to achieve static levitation using any combination of fixed magnets and electric charges. So, you either need an active system (i.e. the levitating spinning top or electromagnet with feedback system), quantum effects (i.e. an object put on a table levitates a tiny amount over it instead of passing through the table), or diamagnetic levitation (the only practical way to get sufficient effect is to use a superconductor as the diamagnetic material). Finally, magnetic levitation won't prevent, and worse, won't damp any vibrations from the air (sound). Do vibration isolation the way it's done in labs -- I've seen a confocal (laser scanning) microscope setup using a heavy marble base, lots of sand, and pneumatic dampers.

7th February 2004, 10:58 PM	#7
karma diyAudio Member Join Date: Feb 2003 Location: hamilton,ontario	yes it would be but it looks nice

7th February 2004, 11:32 PM	#9
tiroth diyAudio Member Join Date: Dec 2001 Location: Pittsburgh, PA, USA	If the CD is wobbling that much you'll have big problems regardless.

7th February 2004, 11:45 PM	#10
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	As long as aluminum part is not higher than the plastic lens protecting cover, the CD has no way to touch anything, unless of course you were using it for other purposes previously

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