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Buskers and electric shocks

Discussion in 'Electronic Repair' started by N_Cook, Oct 10, 2013.

  1. N_Cook

    N_Cook Guest

    Where they use 12V battery and inverter to synthesised mains and then
    SMPS type amp. So the dirty-mains filter caps on the mains side have no
    ground reference and all the grounded points including guitar metal
    parts rise to some highish voltage until someone touches them and
    discharges the caps.
    Ignore it as not a personal safety issue unless the psychological shock
    leads to problems.? Is there a work around, ie metal plate under the
    amp, connected to an amp earth point and a cup of water on the
    soil/pavement under the metal plate?

    ps seventh attempt via e-S/Thuynderbird to s.e.r, uk.test is ok
  2. Phil Allison

    Phil Allison Guest

    "Nutcase Kook "

    ** Nonsense.

    There is simply no supply ground connection so no path for current to flow.

    Where does Nutcase Kook get all this fucking shite from ??

    .... Phil
  3. Guest

    Well now I know what the word busker means. Damn US schools, oh wait, I never paid attention..... I was too busy learning shit....... (go ahead)

    Anyway, the cheapest and easiest way I can think of is to just take the ground of the instruments' inputs and wire them to a wet rag laying on the ground, just fold it up and put the wire in between. Just pour water or beer on it from time to time, like when you are again getting zapped. Don't worryabout grounds on the rest of the shit.

    BTW, isn't there some sort of 12 volt syatem that can eliminate all this extra bullshit ?
  4. N_Cook

    N_Cook Guest

    In Car Entertainment stuff is not structured for use by buskers.
    Otherwise off-the-shelf 12V "leisure" battery+inverter+SMPS+ClassF amp,
    is the most weight efficient , cost efficient way of getting something
    like 500 watts of power, but of course the amp is designed for mains
    power use and so structured for use wuth a good ground/earth, not
    floating around with the vagueries of weather
  5. N_Cook

    N_Cook Guest

    Perhaps a more convenient solution
    fine wire copper or brass mesh from a hobby shop
    Unscrew a rubber foot from the amp and wrap in the mesh.
    Some shield from coax cable pulled and squashed flat
    one end fitted under the foot and the other under a bush nut and glued
    to the amp casing.
    If exceedingly dry weather then some water /beer or piss under the foot.
    Fine mesh, should the amp end up on a table top at some point
  6. Wond

    Wond Guest

    I think its more likely an equipment fault putting mains voltage on
    the instrument, possibly through a capacitor.
    Charge 'em lots, Cookers, you put in a lot of effort.
  7. Guest

    Umm, they are geting charged, that is the problem :)
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