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Mobile phone detector doesn't work properly

Discussion in 'General Electronics Discussion' started by tree, Apr 14, 2012.

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  1. tree

    tree

    1
    0
    Apr 14, 2012
    Hi

    I need help about a simple electronic circuit - mobile phone detector.
    I made this project on breadboard:
    http://www.simple-electronics.com/search/label/555 IC CIRCUITS

    The buzzer and LED should activate when a signal from mobile phone comes to antenna, but as soon as I connect circuit to battery, buzzer and LED start working. (when there is no signal). I made this circuit according to schematics on the webpage stated above.
    I checked everything and couldn't recognize why it doesn't work properly.

    I would appreciate if somebody could help me!

    Thank you!
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,390
    2,774
    Jan 21, 2010
    Show us a picture of your construction. It is quite likely you have made a wiring error (it's the most likely thing and everyone at all levels of skill do it, so we're not picking on you)
     
  3. beckya

    beckya

    7
    0
    Apr 6, 2012
    Mobile Phone

    Off the subject slightly. Do any of you think the emfs from our cell phone is harming us. Dr Black (famous brain dr.) waffles on this question.
     
  4. BobK

    BobK

    7,682
    1,686
    Jan 5, 2010
    How many people have been using cell-phones for how many years? And yet we have seen no increase in the occurrence of the brain cancers that some people insist they are causing. Draw your own conclusions.

    Bob
     
  5. shrtrnd

    shrtrnd

    3,736
    478
    Jan 15, 2010
    Only time will tell.
    Who's at risk for what cancers, how many years might it take, all unknowns.
    I don't know how many studies were ever done with low level radiation over long periods
    of time.
    This will be a good study, because the years are adding up.
    BobK has a good point, but with so much money involved in this business, the profits
    to be made, I don't expect anybody to say cell phones might be bad, anytime soon.
     
  6. BobK

    BobK

    7,682
    1,686
    Jan 5, 2010
    Studies have been done, they have shown no increase in brain cancers.

    People think all radiation is the same. It is not. UV-radidation, X-rays and Gamma-rays cause cancer. Microwave do not, cannot, because they cannot deliver enough energy to break a chemical bond. Sunlight is FAR more dangerous than the microwaves coming from a cell phone.

    Bob
     
  7. davenn

    davenn Moderator

    13,589
    1,872
    Sep 5, 2009
    Because there are no tuned circuits in this unit, its unlikely that it will respond to purely cellphone transmissions. Its probably going to react to a broad range EM fields. All of which would have to be relatively close to the unit.

    cheers
    Dave
     
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