Effect of Magntes on the Bluetooth systems

[xmonroe]

Dear all,

I am mechanical engineer but involved in a bluetooth project. We want to attach the device to a metallic surface with magnets.

I am concerned about the probable effect fot the neodymium (NdFeB) magnets on the electronics... Do you know if is there any problem if you the magnet (diameter: 3mm, lenght: 4 mm) within a distance of 2 - 3 mm of the board?

If you are not familiar with magnets, perhaps you can give me a kind of "magnetic strength" of the bluetooth systems... I mean, which magnetic fiels can be accepted and which not

Thank you very much for your help,

Yours,

Oscar Jiménez
Barcelona (Spain)

 

[Comcokid]

I am not aware of any effect a static magnetic field would have on a bluetooth module or the components it might have internally. Inductors at this frequency are not loaded with a ferrite, and even RF modules at lower frequncies the ferrites are not attracted by a magnet so I would assume there would be no bias or saturation effect.

Are you seeing an issue?

 

[VEBill]

The Hall Effect is pretty weak. Probably no effect.

In theory, a magnet can 'bias' ferrites, but you're not likely to see any effect at all.

Watch out for relays (very unlikely that there are any).

 

[nbucska]

use flat magnets with both S and N poles on one side and
mount then on a larger soft magnetic shield.

Plesae read FAQ240-1032
WEB: <

http://geocities.com/nbucska/>