RE: Power Supplies

["Keith Doxey" <ukha@xxxxxxx>]

Thats the safest way.

The other way is to measure the off load voltage.

If its a 9V power supply and its somewhere between 8.9V and 9.2V is is
almost certainly Regulated.

If it gives you substantially more than 9V ( could be as high as 13V ) then
its unregulated.

Keith

www.diyha.co.uk
www.kat5.tv


> -----Original Message-----
> From: Andrew Kilgore [mailto:amkilgore@xxxxxxx]
> Sent: 13 July 2003 13:43
> To: ukha_d@xxxxxxx
> Subject: Re: [ukha_d] Power Supplies
>
>
> 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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