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From: "Phil Allison"
Subject: Re: Wall wart with two blade polarized plug,,,Why?
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Sat, 5 Oct 2002 08:11:17 +1000
NNTP-Posting-Date: Sat, 05 Oct 2002 07:59:39 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"Kevin McMurtrie" wrote in message
> In article <3D9A856D.99A017C7@110.net>, Jeff Wisnia
> >I'm trying to think of a realistic reason why my little TV's 120 vac -
> >12 vdc 1.0 amp simple xformer/bridge rectifier wall wart needs one of
> >its two input blades wider than the other so that it won't insert into
> >an duplex outlet in a convenient direction. (i.e. so its body doesn't
> >interfere with a right angle cord plug already in the other half of the
> >I've got half a drawer full of wall warts from various now-discarded
> >devices, and all but one have equal width plug blades and can be
> >pluggged into a receptical "either way".
> >Before I file down that wide blade, did I overlook anything? Maybe the
> >designer of this wall wart has the wide blade connected to the end of
> >the transformer primary nearest the secondary so that an insulation
> >breakdown there doesn't connect the hot side of the line to the low
> >voltage circuitry? That seems a stretch to me.
> >Anybody know for sure?
> >Thanks guys,
> There's likely a resistor between the DC negative and the AC neutral.
** Very unlikely in a wall wart. If there it would be several
. . .. . . . . . . . . . . . Phil
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