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5.5KV Neon Sign Transformer for Tesla Coil is being weird. Please help!

Discussion in 'General Electronics Discussion' started by Cookieworks, Nov 22, 2011.

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  1. Cookieworks

    Cookieworks

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    Nov 22, 2011
    Ever since I got this thing, I've been wondering why it does this. First of all, it is a small NST, not one of the big metal cased whatsits that Tesla Coilers use so frequently. Well, anyways, I turn it on and get the normal arc thing... the only catch is that the wires have to be close enough together to arc. If they're not, I cannot move them together to get the arc. Also, after the arc has been broken, the only way to get another is to turn the NST off and back on again. So, what I've found is that when the circuit breaks, there is no way to fix it. Is this a safety mechanism? If so, how do I go about fixing it?
    Thanks!
    -Cookieworks
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    There is a possibility that the transformer is arcing internally (and that would not be a good thing)
     
  3. Cookieworks

    Cookieworks

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    Nov 22, 2011
    Well, I know that it isn't arcing internally. I have taken the trans apart and looked at it. It is simply turning off. Simple as that. It probably has to do with the driver, but how do I stop it?
     
  4. BobK

    BobK

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    If the "transformer" is small and light, it is probably actually a switching power supply. The arc most likely activates a current limit shutdown. Are you using the "transformer" to charge capaciitors? If so, maybe a little (more?) resistance between the power source and capacitors would do the trick.

    Bob
     
    Bradley likes this.
  5. Bradley

    Bradley

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    Mar 17, 2015
    If it's not the old block style NST it's probably got a GFI safety switch in it.
     
  6. davenn

    davenn Moderator

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    Sep 5, 2009
    @Bradley this is an even older thread ... please try looking before you post
     
    Bradley likes this.
  7. Bradley

    Bradley

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    Mar 17, 2015
    Thank you, that's the 2nd time I did it lol I'm new and still learning the site. I just happens to see the post and replied.

    Thank you
    :)
     
    davenn likes this.
  8. davenn

    davenn Moderator

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    Sep 5, 2009
    no probs :)
     
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