On Mon, Jan 07, 2002 at 12:17:41PM +0000, John P. Looney wrote:
> That's the one. Thing is, it has to be removed dozens of times a day,
> depending on how broken what I'm working on. So cases are left open...
Well obviously the 4 steps were a tad tongue in cheek :-) but seriously -
does the CF IDE adapter die when you dosconnect it live or does it lose its
> Nah, don't worry, we outsource production.
I believe you - never mind the millions . . .
> I worry about. Padraig has a flash card that loses all its memory once
> power is removed. Cool or what ?
Not really very flash though.
> As for the static, its generally discharged when I try touch a machine.
> Paul reckons its ESB earth that's not-quite-earth or some such...
Can't see why it'd have anything to do with floating earths which are all
too common. What that's going to do is give you a potential difference
between earth and neutral which is not A Good Thing but is nonetheless
rather common. You build up static by walking around and this static can be
at quite high voltages so if you then touch something earthed you'll
discharge the static because there is a large potential difference between
you and the earthed item, even if this earth is not a very good earth.
Although the static buildup can be at quite high voltage there is very
little power hence static shocks can be annoying (because you feel the
voltage) but do no harm at all to you (because it's current which does the
damage). Remember, "It's the volts that jolt but the mill(iamp)s that kill."
- I think the fatal cross heart current is 17 mA or so - people have of
course survived a lot more but less won't kill you.
Static induced damage to electronic devices occurs because a few angstroms
of SiO2 can be a little more upset by a few microamps than a few kilograms
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