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Question about an oddity

Discussion in 'Electronic Basics' started by Dark Alchemist, Dec 9, 2003.

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  1. How do I remove positive hi-voltage miniscule amps from a 12vdc line? I
    guess that would be called ripple maybe? What happens is you can touch
    the dc power wires and get a crackling and touch the bare wires and a
    spark will jump to your finger. Somehow I need to isolate that from
    going down the 12vdc lines and was thinking a capacitor on the positive
    and negative lines or would that break the 12vdc and only the hivoltage
    would pass through?
     
  2. Where is this high voltage coming from? I think that a high-value capacitor
    in parallel with the power supply would smooth out the ripple, and then you
    can run it through a 12V regulator, as long as the voltage isn't too high.
    Don't forget that the smoothing effect of the capacitor will raise the
    output voltage from 12V to somewhere in between 12V and the peak ripple
    voltage, so you might want to consider using a 7812 regulator and perhaps a
    series resistor to drop the voltage if it's too high.

    --Russell
     
  3. This sounds like static electricity accumulating on an isolated
    supply. Tell us more about the supply and load. Perhaps there is an
    easy to safely drain this high potential.
     
  4. This is negative ion generator (all epoxy sealed) sold from an
    electronics supply house. What it appears to be is exactly as you said
    because it barely works until I touch the outer 2 wires that are coming
    from a 12vdc 800ma wall adapter. I can touch anywheres along the outer
    plastic jacket and it will begin to work properly. So, it appears I
    need to drain this somehow but how using the wall adapter?

    Thank you.
     
  5. Run a wire from either side of the adapter output to the ground socket
    of another receptacle. You can use a new plug, but just wire to the
    ground pin. Or you can put a fork terminal on the end of the wire,
    and slip it under the cover plate mounting screw.
     
  6. so solder a third wire to the negative side and attach the other side to
    ground?
     
  7. That is the general idea. I don't know whether it would be best to
    ground the positive or negative side of the DC supply, and it might be
    a good idea to put a high resistance in the ground line (100K to 1M,
    say). Experiment.
     
  8. Well, that makes for one ugly setup :( Wish Goldmine Electronics out of
    Scottsdale, AZ would tell the whole story and not say you can even hook
    them up to a 9volt battery (when you do the 9 volt battery arcs). It
    takes 12volts dc but you have to use a very elaborate scheme to overcome
    what could be a potentially dangerous situation. Its not something I
    would buy again and I purchased two of the darn things. Only workaround
    I can see is to ditch the 2 ac-dc wall transformers and go with a small
    transformer in the case using a 3 prong wire so I can have the green
    ground wire to attach to the negative (although the positive has voltage
    too).
     
  9. John G

    John G Guest

    Grounding one side or the other should fix your problem.
    Both sides have voltage on them but it is the same.
    It is the same Hi Potential because both sides are
    effectivly together as far
    as the Hi Voltage is concerned.
    The internal resistance of the Plug Pack is very low
    compared to the air
    between the whole device and ground.
     
  10. Rich Grise

    Rich Grise Guest

    If you ground anything, ground the positive lead, if your intent
    is to generate ions. Supposedly, negative ions make you feel good,
    and positive ions make you feel bad.

    Good Luck!
    Rich
     
  11. If I ground the positive lead what do I put between the positive and
    ground or else it will not work.

    Thanks.
     
  12. Rich Grise

    Rich Grise Guest

    I you can't ground the positive side of the supply while the
    rest of it is isolated from everything, then the power supply
    isn't suitable for a negative ion generator.

    Good Luck!
    Rich
     
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