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Article #31222

Re: crash and burn!!! Why no fuse?

#31222
From: Gary
Date: Wed, 17 Aug 1988 02:26
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From article <561@calvin.EE.CORNELL.EDU>, by johns@calvin.EE.CORNELL.EDU (John Sahr):
> Because the transistor/diode switch would probably blow up faster than any
> fuse if it failed, it might be pointless to put even a $.50 fuse in the
> SE or Mac II...
> I am just guessing, based on what I've learned about these type of supplies.
> John Sahr (johns@calvin) [opinions expressed are my own alone]

Fuses are very good in preventing certain types of failures from
becoming fire hazards, but in general, they won't really protect
a hell of a lot in a computer system.  The semiconductors will
blow much faster than a fuse.
Don't forget, if I remember correctly, a fast-blow fuse will
blow in 1 minute at 200% overload, others are much tougher
to blow-out.  They're great for dead-shorts (impulse power >10x
the rated amount).

Even with this point of view, I still over-fuse anything I
have design responsibility on.  I also believe in power-supply
crowbar circuits -- a lot.

Gary
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From: gnome@olivey.olivetti.com (Gary)
Newsgroups: comp.sys.mac
Subject: Re: crash and burn!!!  Why no fuse?
Message-ID: <27429@oliveb.olivetti.com>
Date: 17 Aug 88 02:26:13 GMT
References: <561@calvin.EE.CORNELL.EDU>
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