[sdiy] Fixing humming transformers in 1u rack units

[Magnus Danielson]

cheater cheater wrote:
>> Toroidal transformers are a different matter.  Due to the shape of the
>> core, they have much lower divergent flux.  BUT if you happen to, say,
>> mount it with a bolt that runs through the center hole and connects to
>> the chassis on both sides, this effectively adds another winding to the
>> transformer.  You really don't want that to happen.
> 
> Why?
> Will that work as a secondary winding in an ac/dc transformer?

It will act as another secondary winding in a ac transformer (there is 
no such thing as an ac/dc transformer).

This secondary winding will load the transformer. Breaking the 
conduction path by using isolating washers would help.

Cheers,
Magnus

Cheers,
Magnus