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From: email@example.com (Peter Gutmann)
Subject: Re: Strange failure mode in switchmode power supplies: Followup
Date: Sat, 21 Sep 2002 06:43:43 -0000
Organization: Posted via Supernews, http://www.supernews.com
Sender: firstname.lastname@example.org (Peter Gutmann)
Kevin McMurtrie writes:
>Put a sacrificial system on an extension cord and operate it at a neighbor's
>house with your power. Now operate it at your house with a neighbor's power.
Thanks, that's one combination I haven't tried yet. I'll give that one a go.
>Maybe your house is getting blasted with microwaves. They don't show up on a
>scope but they rectify in some semiconductors to create a bias current.
>How's your UHF TV reception?
Yeah, that was a suspicion... UHF is OK (although it requires a preamp to get
a signal), but you can barely use a DECT phone. I've always suspected the
phone, but I'll have a go at hauling this out to a friend's place to see if it
works there (I'm hoping it's fine everywhere but here, which would make it a
much cheaper and quicker canary than sitting there waiting for another PC to
>Speaking of scopes, post a link to a picture of what the SMPS is doing.
I'll have to see if I can get the digital scope again some weekend... the
output was a reasonably normal (meaning rather noisy) DC signal which wasn't
noticeably different from others I've seen. I'll post a link here if I can
get access to the scope again (this could take awhile).
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