On 26/10/16 23:08, alan.b.pearce@stfc.ac.uk wrote:
> You may well find that the innards of the charger are identical whatever =
the mains voltage marking. However because your unit is fitted with a plug =
intended to be used in a market where 110V is the norm, then that is what i=
t gets marked as. If fitted with a plug for a 230v market then it will be m=
arked for that. They don't mark it as a wide range (88-264) as to do so sug=
gests that people will attempt to use dodgy adapter arrangements to get the=
ir unit to plug into a mains system they are not familiar with, with all th=
e attendant risk of someone getting electric shock or worse.
>
> Come across this very scenario on model railway wall warts.
>   =20
There is also a common design technique where the only difference=20
between the ~115V and 230V configurations is a single link wire (or a=20
switch, but I assume if your PSU had a voltage switch you wouldn't be=20
asking this question). With the link disconnected the front end=20
rectifier acts as a bridge, with the link in place it acts as a voltage=20
doubler.

--=20
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