[sdiy] what makes a transformer vibrate?

[ASSI]

The force that changing magnetic fields exert on the windings and the 
core  make a transformer vibrate. If windings and core sheets are lose 
it will be worse. You can losen both if the transformer is overloaded, 
either by accident or by construction. The stray field of the 
transformer will also influence any magnetic or elctrically conductive 
material in the vicinity.

On Freitag, 28. Januar 2005 11:53, Nils Pipenbrinck wrote:
> Is this a problem, and how to get rid of it?

It is an annoyance, especially if one of the harmonics hum instead of 
the fundamental. You get rid of it by replacing the transformer or by 
vacuum soaking it in resin. The better ones already are treated that 
way, but sometimes the resin becomes brittle after some time.

Toroidal transformers have far less stray field to entice sympathetic 
vibrations and less chance of showing core hum.


Achim.
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