On 28/10/16 09:24, alan.b.pearce@stfc.ac.uk wrote:
>> There is also a common design technique where the only difference
>> between the ~115V and 230V configurations is a single link wire (or a sw=
itch,
>> but I assume if your PSU had a voltage switch you wouldn't be asking thi=
s
>> question). With the link disconnected the front end rectifier acts as a =
bridge,
>> with the link in place it acts as a voltage doubler.
>>     =20
> Is that technique still used? With modern wide range SMPS chips I thought=
 doing that had dropped out in favour of the universal method which also sa=
ves having to change the board or switch.
>   =20
Afaict it's less common than it used to be but many crappy old PSU=20
designs are still in production.
--=20
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