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Thread: electricity + me = not good

  1. #1
    I've got no answer! Question's Avatar
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    Post electricity + me = not good

    I just needed somewhere to put how happy I am to be alive right now...I was working on a big screen tv (It's a little fuzzy and I've isolated the problem to the antenna box with the coax connectors) and I leaned over while the power was on and touched a circuit attached to the screen with my arm...Let's just say that it was ..unpleasant. I'm still a little...well, excuse the pun, but...shocked about it all. I just thank God that I'm still here..I appreciate life a whole lot more than I did a few minutes ago.
    1999 Plymouth Voyager (That's right, big-pimpin' in a minivan.)
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  2. #2
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    Oh man, the induction coils in TVs are insane!!! I almost killed my mom with one of those when I was 10. Let's just say that one of those large 12v lantern batteries can knock someone out when properly wired to 2 probes held by an unsuspecting parental unit.


    I'm glad you didn't take too much damage

    -Miles
    Near Completion: Intel P166 MMX, 32MB ram, 13GB Hard Drive, Keypad, 4x40 LCD. Sproggy MK2.6 ATX PSU. Win98SE with Winamp and Mark Zehnder Plugin. (Web-site: very soon)

  3. #3
    Retired Admin Aaron Cake's Avatar
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    Hehehe...Flyback transformers from TVs can be great fun...See http://www.aaroncake.net/circuits/hvgen.htm . I keep a collection of them at the house because high voltage generators are just so very useful...

    However, there is an obvious saftey hazard here. The chasis of most TVs is NOT isolated from ground, meaning that it is always dangerous, even if the TV is off. The switching supplies in most modern TVs can store several hundred volts even with the unit turned off and unplugged. However, the biggest hazard comes from the CRT tube. They act like giant capacitors, and can store charges of 40,000V+ for many years. Therefore, it is very important to discharge the CRT before any work is done on teh set. Most electronics stores sell a tool for this, but if you know what you are doing you can use screwdrivers, a jumper cable, and a large value resistor.
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  4. #4
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    Does the actual tv tube retain the voltage??
    I normally discharge the High Voltage terminal using 2 screwdrivers, or is it the tube I am discharging??
    of course you can't discharge anything on a powered up tv.. make some nice arcs though..

  5. #5
    Retired Admin Aaron Cake's Avatar
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    It is the actual CRT tube that stores the charge. Also, modern TVs usually have whimpy flyback transformers and use a voltage multiplier circuit. Those will store quite a charge as well.

    I wouldn't recommend messing around with it while it is turned on. That's just an invitation to be killed.
    Player: Pentium 166MMX, Amptron 598LMR MB w/onboard Sound, Video, LAN, 10.2 Gig Fujitsu Laptop HD, Arise 865 DC-DC Converter, Lexan Case, Custom Software w/Voice Interface, MS Access Based Playlists
    Car: 1986 Mazda RX-7 Turbo (highly modded), 1978 RX-7 Beater (Dead, parting out), 2001 Honda Insight
    "If one more body-kitted, cut-spring-lowered, farty-exhausted Civic revs on me at an intersection, I swear I'm going to get out of my car and cram their ridiculous double-decker aluminium wing firmly up their rump."

  6. #6
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    what the.. i see a pic fo u with a light saber thing.

    are u saying what ever ure holding is getting powered through you ?

    that looks dangerous hey

  7. #7
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    Its a fluro tube..

    Yeah, that it dangerous..

  8. #8
    Retired Admin Aaron Cake's Avatar
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    In that picture, a high voltage generator is connected to a metal plate I am standing on. My body was charged with roughly 50,000V of high frequency electricity, causing the fluouescent tube to light. Actually, it's perfectly safe.
    Player: Pentium 166MMX, Amptron 598LMR MB w/onboard Sound, Video, LAN, 10.2 Gig Fujitsu Laptop HD, Arise 865 DC-DC Converter, Lexan Case, Custom Software w/Voice Interface, MS Access Based Playlists
    Car: 1986 Mazda RX-7 Turbo (highly modded), 1978 RX-7 Beater (Dead, parting out), 2001 Honda Insight
    "If one more body-kitted, cut-spring-lowered, farty-exhausted Civic revs on me at an intersection, I swear I'm going to get out of my car and cram their ridiculous double-decker aluminium wing firmly up their rump."

  9. #9
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    yeah, perfectly safe... right,

    kids feal free to try this at home without parents permission

  10. #10
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    Keep in mind that although you may have discharged the tube (at the big red hole), a tube left sitting on a shelf can accumulate a charge over time, just from the ambient static electricity in the air.

    Trust me on this. I ZAAAP! know...

    ~m
    PII 266, 512 MB RAM, 10 Gig, 36x CD-ROM, 16x DVD, DeLorme GPS, 5.6" LCD Screen, Dschmidt power controller, Keypower ATX DC-DC Supply, PowerAmp Macro controller, Dauphin mini-Kbd.
    Sony Head Unit, Sony Unilink input selector, rear deck Kenwood 6x9's, stock door spkrs... All in my '96 Civic, of course :}
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