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Re: OT PSU's
- Subject: Re: OT PSU's
- From: "Patrick Lidstone" <patrick@xxxxxxxxxxxx>
- Date: Mon, 28 Jun 2004 15:13:20 -0000
--- In ukha_d@xxxxxxx, Jim Noble <yahoo-groups@b...> wrote:
> Patrick Lidstone wrote:
>
> > --- In ukha_d@xxxxxxx, groups@w... wrote:
> > > I am after a PSU that is rated 18 Vac 300mA but despite
weeks of
> > searching the
> > > nearest I can find is one from CPC that is 18 Vac 500mA
unregulated.
> > >
> > > My question is is this safe to use?
> >
> > Yes, without any doubt whatsoever.
>
>
> I'm not so sure about that. Unregulated power supplies put out higher
> voltages when not used at the design load.
>
> If the no-load voltage of the psu is less than the terminal voltage
(ie
> one that will kill it!) of what you want to connect, then you're
> probably ok. Otherwise; your call ;-)
>
> (It'll probably only be a few volts higher at 300mA though).
>
> You'd definitely be safe with a >300mA regulated psu...
>
You can't have a regulated AC supply. It's a contradiction in terms.
Patrick
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