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"Prototype Nokia phone recharges without wires"

Discussion in 'Electronic Design' started by John Doe, Jun 17, 2009.

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  1. John Doe

    John Doe Guest

    Does your opinion make a hen's shit of difference in the world,
    Jack?

    The idea of capturing stray airwaves is a good one, even if it
    is only a marketing ploy.
     
  2. nospam

    nospam Guest

    In the same way that capturing stray flammable gasses from the atmosphere
    is a good idea?

    Maybe we could save the world by using fart powered fuel cells to help
    charge phone batteries. Capturing some greenhouse gas at source it would be
    a double win.

    --
     
  3. TheM

    TheM Guest

    ....Methanol-powered micro fuel cells are racing toward market...
    That was November 2001

    I can vividly imagine a cell phone with "fart gas" nozzle, just racing
    toward mass market adoption.

    M
     
  4. James Arthur

    James Arthur Guest

    Have they? What'd they do?
     
  5. No. It is snake oil, and no retarded marketing ploy is good. What do
    you think is partly to blame for the erosion of this country's economy?

    Do the math. RF "Airwaves" equals femtowatts, at best, perhaps a bit
    more near the transmitter. So it would take a LONG time or a LOT of
    signals (multiple tuners?) to even equal the energy needed to pump the
    battery charge circuit in the unit.

    Do the math EM energy falls off at a rate of the square of the distance.
    That is how flux density degrades through space. Each flux line is the
    square of the distance away from the previous set. So too goes the
    power.

    So putting the coil right next to an "source coil", as is the case with
    say, the electric toothbrushes that have no charging pins in the charging
    stand does work.

    Putting the coil several feet away, makes for very little useable
    energy. Even less with unstructured sources like the house wiring
    suggestion, less still with rf feeds.

    So to the trained person, the idea sucks because it misleads the
    obvious lay persons, like yourself, it seems.
     
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