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L.E.D Flashlight

Discussion in 'Electronic Repair' started by geoff smith, Jul 13, 2005.

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  1. geoff smith

    geoff smith Guest

    I have seen an advert for an L.E.D flashlight that is activated by shaking
    it,there are no batteries.
    How does it work ?
     
  2. CJT

    CJT Guest

    Probably about as well as one can shake it. Maybe Fox could use it on
    their new dance contest show.
     
  3. from http://www.generationgear.com/products/shakelight_technology.html

    "
    It all started back in 1830 when the English physicist Michael Faraday
    discovered that passing a magnet near a wire coil could induce an
    electric current in the wire. This "Faraday Principle" forms the
    foundation for all of today's electric motors, generators, &
    transformers.

    Generation Gear has taken this principle to the next level. We have
    combined it with two advanced semiconductor devices to create a
    flashlight that never needs batteries!

    Shaking the ShakeLight will cause a magnet to slide back and forth
    inside the flashlight handle. As it does so, it passes through a copper
    coil, thereby inducing a current in the coil's wire. This current is
    then stored inside an electronic component called a capacitor which in
    turn provides power to the LED (Light Emitting Diode).
    "
     
  4. NSM

    NSM Guest

    It's like a reverse vibrator.

    N
     
  5. Jim Yanik

    Jim Yanik Guest

    A local TV news consumer segment did a test on these LED lights and found
    them to not be very useful,nor worth the money.They dim very quickly.
     
  6. CJT

    CJT Guest

    I think it would have to be a solar powered vibrator to make the analogy
    work.
     
  7. James Jones

    James Jones Guest

    All they need is an appropriate celebrity to endorse and demonstrate it.
    Somebody like Michael J. Fox or Muhammad Ali. ;-)
     
  8. Actually, the vibrators I've taken apart have a cheap DC motor in them,
    and then a weight on the shaft that is asymmetrical. So when the motor
    turns, there is an imbalance, hence the vibrations.

    The concept of a reverse vibrator is that if you shake it, you get power,
    while a vibrator shakes when you apply power.

    But since there is a motor in there, it's not a great analogy. Everyone
    knows that an electrical motor can generate power if you turn the shaft.
    You aren't likely to be able to rotate the shaft of the vibrator motor
    by shaking it, so it's not a reversible concept.

    Let's not forget those cheap DC motors have magnets in them, and
    a winding. Not really different from the concept of those flashlights.
    The difference being the mechanical arrangement. Instead of turning
    the shaft to get voltage, there is a more free-form generator that
    works when you shake it.

    Indeed, I have a windup LED flashlight, and I assume the only real
    difference is that I crank it to charge it, rather than shake it.

    Michael
     
  9. James Sweet

    James Sweet Guest


    I played with one in a store once that worked ok, but it did take a lot of
    shaking to charge it up. Would be good as an emergency backup as the
    batteries can never go dead.
     
  10. Asimov

    Asimov Guest

    "NSM" bravely wrote to "All" (13 Jul 05 21:34:29)
    --- on the heady topic of "Re: L.E.D Flashlight"

    NS> From: "NSM" <>
    NS> Xref: aeinews sci.electronics.repair:53131


    NS> It's like a reverse vibrator.


    Don't excite the ladies needlessly by using those words, please...

    A*s*i*m*o*v

    .... From small chips to big breasts, silicone is great!
     
  11. And it's very difficult to activate without making an obscene gesture.
     
  12. none

    none Guest

    I hear you can go blind if you use it too much also.
     
  13. Yeah, the UV output is pretty high.
     
  14. STOP right there! Thank you. :)
     
  15. Eric

    Eric Guest

    Big magnetic going past a coil, generator power to charge a capacitor, that
    runs the LED

    keep away from your credit cards, phone cards or any other card that has a
    magnetic strip on it.



    I have seen an advert for an L.E.D flashlight that is activated by shaking
    it,there are no batteries.
    How does it work ?
     
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