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From: "Phil Allison"
Subject: Re: Doubling wallwart power rating
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Mon, 7 Oct 2002 10:28:47 +1000
NNTP-Posting-Date: Mon, 07 Oct 2002 10:17:05 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"N. Thornton" wrote in message
> "Phil Allison" wrote in message
> > "N. Thornton" wrote in message
> > news:email@example.com...
> > > Wall warts come in plastic cases, which must be very poor heat
> > > dissipators. If vent holes are added top and bottom, I wonder what
> > > sort of power out increase one could get.
> > > More TF cooling = more i flow acceptable.
> > > More diode cooling = more i flow acceptable also.
> > >
> > > Anyone have an idea what sort of gains we might be looking at?
> > ** In practice - none. It must be allowed that wall warts are
> > installed with any ventilation.
> > Also, I would not feel comfortable about one that was not
> > object and water proof.
> > Rergards, Phil
> Well, tell us why then Phil.
> I dont see how running cooler would make no difference to their max
> safe current delivery.
** I am challenging the presumption that adding holes will always do
that. The unit may become covered up with an item of clothing for example.
They often sit in power boards on the floor - many of mine do.
> I can't offhand think of a scenario where a ventilated wall wart would
> become dangerous whereas a non vented one would not, in the same
** A glass of juice spills on it or rain water. The sealed one can
be easily and safey cleaned - the other cannot.
> Why would wall warts need to be waterproof?
** Safety - and small object proof too as Tom Faloon seems to agree.
The fact is they sit on the floor so often where gravity does its worst.
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