Am Son, 2003-03-30 um 19.19 schrieb Pigeon: > On Sun, Mar 30, 2003 at 05:29:49PM +1000, Ross Cottrell wrote: > > Nathan E Norman wrote: > > > > >On Sat, Mar 29, 2003 at 12:57:44AM -0800, Vineet Kumar wrote: > > > > > > > > >>* Pigeon <jah.pigeon@ukonline.co.uk> [20030327 21:15 PST]: > > >> > > >> > > >>>On Fri, Mar 28, 2003 at 02:23:22PM +1100, Matthew Palmer wrote: > > >>> > > >>> > > >>>>On Wed, 26 Mar 2003, Pigeon wrote: > > >>>> > > >>>> > > >>>> > > >>>>>>>If you leave it for a few hours after disconnecting the power, you > > >>>>>>>should be safe. The power supply should have resistors to discharge > > >>>>>>>the > > >>>>>>>capacitors when they're switched off. > > >>>>>>> > > >>>>>>> > > >>>>>It SHOULD have, but often does not. If it does, less than a minute is > > >>>>>all you need. If it doesn't, a few days might not be enough. So check > > >>>>>it with a voltmeter. > > >>>>> > > >>>>> > > >>>>Misparsed as "check it with a volunteer". Might be a problem if you're > > >>>>at > > >>>>home or in a small company where a missing luser might be noticed... > > >>>> > > >>>> > > >>>In electronics labs etc, if someone suddenly says "Catch!" and lobs > > >>>something at you, don't catch it. It's probably a capacitor with a > > >>>nice hefty charge in it. > > >>> > > >>> > > >>Pigeon, dude ... you've got to find some less hostile friends! ;-) > > >> > > >> > > > > > >Actually, I think that many people in electronics labs are just this > > >way. They're very friendly people otherwise :-) > > Yeah, it goes with the territory - an interest in hair-raising > (literally or otherwise) technologically-based stunts. > > We had considerable fun at the plant-hire company I worked at with the > 4kV probe on the portable electrical appliance insulation tester. One > bloke saw stars after testing the minimum safe distance between the > probe and his tongue. BTW: Don't try this at home Kids! The "bloke" only survived the 4KV shock because the insulation tester doesn't deliver much Amps. *Don't* *even* *think* about touching live wires just to see the stars. Chances are good that you will die a very ugly death. While a shock < 300VAC doesn't harm you most of the time, 4KV are guaranteed 100% deadly. > We also got up to other tricks like taping two bolts end-to-end into a > short metal tube with the charge out of a nail gun cartridge in > between the ends of the bolts and dropping this contrivance end-on > onto the concrete floor. Also chasing each other around the racking in > games of what was effectively don't-touch-the-floor tag, except that > instead of touching someone to tag them we shot them with an air pistol. > > > >Full disclosure; my dad taught me this trick when I told him we were > > >going to do some experiments at school. There's nothing like repairing an AC adapter and getting the shock of your live because it has 3 (!!!) 1F capacitors in parallel. Man 230VAC *do* hurt ;) [...] -- Matthias Hentges Cologne / Germany [www.hentges.net] -> PGP welcome, HTML tolerated ICQ: 97 26 97 4 -> No files, no URL's My OS: Debian Woody: Geek by Nature, Linux by Choice
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