The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
From: "Phil Allison"
References: <firstname.lastname@example.org> <email@example.com> <8e+6RgBNico9EwL3@jmwa.demon.co.uk> <firstname.lastname@example.org> <email@example.com>
Subject: Re: Doubling wallwart power rating
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Wed, 9 Oct 2002 21:12:56 +1000
NNTP-Posting-Date: Wed, 09 Oct 2002 21:00:50 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"Tony Williams" wrote in message
> In article ,
> Phil Allison wrote:
> > "Tony Williams" wrote in message
> > news:firstname.lastname@example.org...
> > > I do believe that this method of designing/using
> > > transformers is an attempt to get the no load
> > > iron losses near to the full load copper losses.
> > ** Seemsw to me the iron loss is small compared to copper loss.
> I used an RS 1KVA 240:120 autotransformer about
> 15 years ago. The surface temperature of the
> laminations was higher at No-load than at Full-load.
> About 55C to 60C, versus 45C to 55C.
** Hmmm, sounds like it was "engineered" for 60 Hz operation - very
The off load amps or VA must have been horrendous !!
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup