Re: Re: Dumb question re power adapter...

["Paul Gordon" <paul_gordon@xxxxxxx>]

Cheers Keith, - knew you'd know the right answer!

BTW, - your parcel has now made it as far as the having been boxed up and
wrapped in brown paper stage, complete with your address written on the
front!! - however, I (typically) found one of the motherboard manuals had
been left out of the package just seconds after I'd finished wrapping it!
:(
So I've wrapped that seperately, and I'll stick it to the main package
with parcel tape. - that's the delay at the moment, - I can't find aby
parcel tape!!  - I'll buy a roll when I'm out and about...

Paul G.


>From: "keithdoxey" <ukha@xxxxxxx>
>Reply-To: ukha_d@xxxxxxx
>To: ukha_d@xxxxxxx
>Subject: [ukha_d] Re: Dumb question re power adapter...
>Date: Sat, 22 Dec 2001 11:09:18 -0000
>
>Not a dumb question at all.
>
>The wrong PSU can wreck something instantly if the device is
>unprotected.
>
>The Laptop PSU will be fine as it is a regulated PSU giving out 15V
>at any current upto its 3A limit.
>
>A PSU with a higher current rating is fine so long as 2 conditions
>are met....
>1. Minimum Load - SwitchMode PSU's often have a minimum load required
>on at least one output to ensure correct operation (PC PSU's etc)
>
>2. It is a REGULATED supply. An unregulated supply is guaranteed to
>be able to supply its rated Voltage at its maximum current. If the
>current drawn is substantially lower than that, there can be a much
>greater voltage on the output. Classic examples are the PSU's used on
>Answering machines. Often rated at 15V @ 750mA or similar, Off load
>they will measure upto 22V. So long as the device being connected has
>its own internal regulation there is no problem unless it is
>excessively high.
>
>This is the approach I took with KAT5. Regulation and Polarity
>protection are built in meaning that cheaper unregulated supplies
>could be used whilst at the same time the units are protected against
>the wrong PSU being connected :-)
>
>HTH
>
>Keith
>

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