Date: Sun, 19 Dec 1999 14:02:11 -0700 From: Wes Peters <wes@softweyr.com> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: "Louis A. Mamakos" <louie@TransSys.COM>, Tim Tsai <tim@futuresouth.com>, Sergey Babkin <babkin@bellatlantic.net>, freebsd-hackers@FreeBSD.ORG Subject: Re: Cool little 100BaseTX switch - they're coming down in price Message-ID: <385D47D3.FCEE9EAB@softweyr.com> References: <199912190410.UAA01049@apollo.backplane.com> <385C60FC.7613CB55@bellatlantic.net> <19991218225758.A23729@futuresouth.com> <199912190556.AAA08484@whizzo.transsys.com> <199912191943.LAA06826@apollo.backplane.com>
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Matthew Dillon wrote:
>
> :with a *really* big heatsink attached -this is the "bridge on chip". And
> :I noticed another, smaller IC which had a hole blown out of the epoxy case
> :(which subsequently allowed the smoke to escape.
> :
> :It was than than I make the connection - Hmm.. SGI LCD monitor don't work.
> :Ethernet switch makes smoke. Ethernet switch wants 5VDC power brick.
> :SGI LCD monitor wants 12VDC power brick. Ooops!
> :
> :So, after switching power bricks, the SGI LCD monitor starts working again.
> :It really wants 12V and not 5V.
> :
> :louie
>
> Ouch. That switch is using a terrible design if it blows up with too
> high a DC voltage input!
>
> I really hate these switching regulated DC wall plugs. They always use
> cheap caps in them to save money and then don't bother adding any
> protection to the motherboard. I prefer AC wall plugs or unregulated DC
> wall plugs and then a small switching regulator on the motherboard. That
> way you can throw anything up to 40V into it and it will still work.
And nearly double the cost of the item, and make it much more difficult
(read as "expensive") to pass FCC/EC requirements. You may prefer such
things, but you're not willing to pay for them. (Generic "you" meaning
"everyone" here).
--
"Where am I, and what am I doing in this handbasket?"
Wes Peters Softweyr LLC
wes@softweyr.com http://softweyr.com/
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