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Generating electricity from cell phone tower transmissions

Discussion in 'General Electronics Discussion' started by oz93666, Jul 2, 2016.

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  1. oz93666

    oz93666

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    Dec 7, 2014
    Someone I was communicating with online , happened to mention their bedroom was 30 meters from a cell tower.

    I flippantly suggested he may be able to use the transmitions as a source of power , a coil of wire should be able to light a small led wired in series with it , perhaps a capacitor across the led to even things out .

    Am I correct ? what would be a good coil diameter ?
     
  2. davenn

    davenn Moderator

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    Sep 5, 2009
    probably not likely

    you are not the first to have thought of this
    the amount of power available for harnessing is absolutely tiny .... micro volts
     
    Last edited: Jul 2, 2016
  3. oz93666

    oz93666

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    Dec 7, 2014
    Power is measured in micro volts?.... Sure it would be tiny, but enough for a small led me thinks.
     
  4. HellasTechn

    HellasTechn

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    Apr 14, 2013
    WOW... I am really sorry to say that he is most likely to get cancer or leukemia rather than electrical power being so close to such tower.
     
    Arouse1973 likes this.
  5. Alec_t

    Alec_t

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    Jul 7, 2015
    I'd be surprised if there were much energy to harvest or cause health problems if you're that close to the tower. The antennae are highly directional in the vertical plane, so you'd probably be in a radio 'shadow'.
     
  6. BobK

    BobK

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    Jan 5, 2010
    Seeing as the cell phone transmissions are microwaves, why not use them to cook your food?

    Bob
     
    Arouse1973 likes this.
  7. davenn

    davenn Moderator

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    no it wont unless you are standing right beside the antenna
    ... do you know how much a LED needs to work ?
     
  8. oz93666

    oz93666

    38
    1
    Dec 7, 2014
    Just tried a small one from a 12v supply shows a light with over 1Mohm in series (2.7 voltage drop across led)
    V=IR .....12-2.7 =I x 1000000 I= 9.3 micro amps P= IV = 9.3x2.7= 25 microWatts

    So a small led will give light when consuming 25 micro watts (ten to the minus 6)= 0.000025Watts
     
  9. davenn

    davenn Moderator

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    Sep 5, 2009

    but it's the micro Volts ;) ... try the same thing with only 25uV

    it's not going to work as u need the ~ 2.7V minimum to get the LED to light up
     
  10. oz93666

    oz93666

    38
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    Dec 7, 2014
    Voltage is not a problem ,you just increase the number of turns in the coil till you get it as high as you want.
     
  11. davenn

    davenn Moderator

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    Sep 5, 2009
    that's not going to produce additional power ... as doing that is going to increase the resistance of the coil and negate any gains



    since you don't seem to want to listen to reason
    thread closed
     
    Sadlercomfort likes this.
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