Re: Power Supplies

["Andrew Kilgore" <amkilgore@xxxxxxx>]

Hi,

How can I tell if a PSU is regulated or not...?
Is there some kind of symbol or something...?
Or should I assume unless it explicitly states "Regulated" that
it is
unregulated...?

Many thanks,
Andy.

----- Original Message -----
From: "Steve Morgan" <steve@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Tuesday, July 08, 2003 6:21 AM
Subject: RE: [ukha_d] Power Supplies


> > -----Original Message-----
> > From: Phil Harris [mailto:phil@xxxxxxx]
> >
> > > >... it is always OK to use a *REGULATED* PSU in place of
an
> > > >unregulated
> > >
> > > Is that strictly speaking true?
> >
> > Well given that a question has been asked and an answer
> > requested then much as I feel it's pointless saying it but
> > "Yes, it is true".
> >
> > Otherwise I wouldn't have bothered saying it.
>
> It was my polite way of saying "Phil, you're talking shite".
Needless to
> say, I shouldn't have bothered.
>
> In order to minimise heat dissipation, you choose a supply voltage as
> close to that required to provide the required output voltage, taking
> into account the voltage drop of the regulator. A 12V unregulated PSU
> can be used with a 12V linear regulator to provide a 12V regulated
> supply. A 12V regulated PSU used with a 12V linear regulator will
> provide an output of less that 12V because of the inherent voltage
drop.
>
> Regardless of how conservative you consider manufacturers 'should' be
> with their designs, if they say an unregulated supply is required you
> should not assume that you can blindy replace it with a regulated one.
>
> Steve
>
>
>
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