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Date: Sat, 21 Sep 96 20:39 BST-1
From: p_marshall@ci*.co*.co*.uk* (Paul Marshall)
Subject: AUL Lighting
To: techdiver@terra.net
Duncan wrote:
> 
> In Reply to the post talking about 12v to 110v convertors this is 
> rather more work than is necessary.
> 
> The easiest way to get 120v in Britain is to use a standard 
> center tapped transfomer.
> 
> Using only the primary side of the transformer you can convert 240-
> 120 volts or indeed you can even go the other way 120-240.
> 
>    Primary side of any standard 240v transformer
>       _______________________
>   P  (                    |
>   R  (                    |
>   I  (                    |
>   M  (  Centre tap        |
>   A  (------------       240v a.c.
>   R  (           |        | 
>   Y  (          120v a.c. |
>      (           |        |
>      (___________|________|___
>     
-- snip --

I would definitely NOT recommend this solution - by all means use a small
autotransformer (a transformer with a single tapped winding) with a 110V 
tap
but DON'T use the primary of an isolating transformer as described.
240V Primary windings are not rated to carry load at the centre tap and 
would
almost certainly overheat - possibly to the point where it may catch fire 
if left
unattended and powered through too large a fuse!

Plenty of small auto transformers are available for little money - but a 
neater
solution would certainly be a purpose built adaptor with the correct 
socket
fitted to accept the 110V plug.

Paul

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