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  1.    #1  
    Has anyone else noticed that the speaker on the Treo is magnetic? I find this quite strange, surely it's not a magnet based speaker? I'd have expected it to be piezoelectric.
    Good fun though, I've been picking up paperclips while on hold (I'm easily amused)
    Animo et Fide
  2. #2  
    i thought magnets damaged the colour in the screen .no? is this not an issue with new screens?
    Nokia 3210 > Nokia 3310 >Palm Vx > Palm M105 >Treo 180g and Nokia 8850 > Treo 270 > Treo 600 > Sony TH55 > Tapwave Zodiac 2 > Treo 650 GSM > Imate KJam > Treo 750v

    Formerly Known As PRANKSTAR
  3. #3  
    yeah, and watch out for your credit cards!! they can become demagnetized!!!
  4.    #4  
    screen shouldn't be affected, it's not like a CRT. Credit cards could be an issue though!
    Animo et Fide
  5. #5  
    no, credit cards cannot be demagnetized like that. it takes a lot more to demagentize credit cards than simple exposure to magnetic fields - they have to be pretty powerful magnetic fields. i have seen tests done on magnetic cards using a powerful electromagnet and only at pretty high levels and on floating the credit card over the electromagnet, does the card die. i think there was an episode in MythBusters about this and they did the same thing.
  6. #6  
    A cheap magnet-backed $1-store tape measurer erased the strip on my hotel key once. I learned quickly not to carry both in the same pocket, and to never throw that tape in my back pocket!
  7. #7  
    IIRC from Physics 101 a long time ago, the piezoelectric effect generates a voltage in response to mechanical work, eg a pe mic diaphram being hit by sound waves or a pe gas grill lighter being squeezed by your hand. There are no pe speakers that I know of. A speaker has to have a magnet for it to work.
  8.    #8  
    The piezoelectric effect translates electric current into physical movement or vice versa. There's no reason not to use piezoelectrics in a speaker - except that the movement is small and you can't make the sound very loud, but the treo isn't very loud.
    Last edited by PeterBrown; 08/05/2004 at 03:08 AM.
    Animo et Fide
  9. #9  
    PetrBrown- You are right that it can be used for either. Guess I only remember half of my Physics 101.

    http://www.encyclopedia.com/html/p1/piezoele.asp

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