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- Newsgroups: sci.electronics
- Path: sparky!uunet!sun-barr!apple!constellation!unx.ucc.okstate.edu!datacomm.ucc.okstate.edu!martin
- From: martin@datacomm.ucc.okstate.edu (Martin McCormick)
- Subject: Re: SHOCKING STORIES
- Message-ID: <1992Jul22.173218.26194@unx.ucc.okstate.edu>
- Sender: news@unx.ucc.okstate.edu (USENET News System)
- Organization: Oklahoma State University, Stillwater, OK
- References: <1992Jul18.175339.10396@newstand.syr.edu>
- Date: Wed, 22 Jul 1992 17:32:18 GMT
- Lines: 29
-
- In article <1992Jul18.175339.10396@newstand.syr.edu> feliccia@rodan.acs.syr.edu (Nicholas J Feliccia) writes:
- >..
- >
- >Ok. I want to know from the net people. What is the largest voltage shock
- >you have ever received (and survived.) I am not talking about rewiring
- >a light switch. I am talking about kissing the flyback transformer.
-
- Once upon a time, when I was an electronics technician with the Audio Visual
- department, here, we got a dead monitor in for service. It had no high
- voltage, but I thought I was being really smart to discharge the CRT anode.
- It showed no voltage so I started looking at the input to the power supply.
- If my memory serves me, the line cord went through a bridge rectifier, a
- 200uf electrolitic capacitor and, then, to a fuse which separated that circuit
- from the switching transistor which drove the flyback. My last clear memory
- was of snaking a probe along the glass body of the fuse to the other end
- to see if it was good. What I didn't know at the time was that the 117-Volt
- power line charged that big capacitor to peak voltage. There was no bleader
- across it so it sat there at about 180 volts waiting to shake my hand.
- The fuse was blown and there was nothing to discharge it until my hand
- touched the other end of the fuse. It felt like getting hit with a hammer.
- The juice went through my right arm, and I don't know why I didn't jump and
- break the neck off the CRT, but I didn't.
- I have grazed 250 volts before, but that only hurt a little and
- startled me. The 200uf capacitor really nailed me and what's even better,
- it still made a big spark when I shorted it out later so as not to get hit
- again.
-
- Martin McCormick WB5AGZ Stillwater, OK
- O.S.U. Computer Center Data Communications Group
-