[sdiy] what makes a transformer vibrate?

[Harry Bissell Jr]

Transformers vibrate when you set them to 'silent'
and the little motor with the off-center weight
spins...

...oh wait... that's an FCP that does that (silly me)

1) Loose windings

2) loose lamination in the core

3) magentostriction in the core (change in physical
size with applied magnetic field)

Number three is not avoidable

H^) harry


--- Nils Pipenbrinck <np at inverse-entertainment.de>
wrote:

> Is this a problem, and how to get rid of it?
> 
> I have a old Nordmende transistor radio from the
> 60th in my kitchen. 
> Don't use it much, but yesterday evening I noticed
> how loud the little 
> power transformer vibrates. It's the original
> external mains adapter, 
> and I don't want to replace it. (it's just a 220V to
> 12V transformer, a 
> fuse and 4 rectifier diodes, but the housing and
> inner life are still 
> original and look very funky).
> 
>   Nils
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