Re: buzz buzz buzz - I wonder why it does?

[Richard Malcolm-Smith <rich@xxxxxxx>]

> Keith Doxey wrote:
> 
> Thats an AUTO-TRANSFORMER.
> 
> The 110V output is NOT isolated from the mains.
> 
> A site transformer is fully isolated and centre tapped so each of
the
> output leads is 55V with respect to earth.

All the stepdown transformers I have ever bought have being auto
transformers. Some places sell ones that are isolating, but they have
no
connection to the secondary at all (Floating) - small ones are
wonderfull for solving ground loop problems with audio where cutting
the
earth just seems wrong.

What exactly is a site transformer? How does it differ from a normal
(isolated) one?

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