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About Piezo disks...

Discussion in 'Misc Electronics' started by Josh, Mar 2, 2005.

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  1. Josh

    Josh Guest

    I just found out about them a week ago. First Query: Would it be
    possible to insert one into someone's clothing (So it wouldn't be
    noticable to them) to hear things like subvocalizations or other bodily
    noises, etc.? Second Query: What kind of power source do they need?
    I've heard some RFID's can run on the power of the human body itself.
    Thankis for any replies.
    -Josh
     
  2. Maybe... This is more on mechnaical design than electronics problem..
    Piezo disks are used for example to pick up sounds from surfaces,
    for example from some musical instruments.
    Piezo discs when used as microphone do not need any power source.
    They are passive devices that convert mechnical forces applies to them
    top electrical voltage output. When you hit/bend etc.. the disck then
    you get voltage out. The voltage is stonger the more force you apply.
     
  3. Jerry G.

    Jerry G. Guest

    You have to have a way to mechanically couple the microphone type device to
    the person's body. What you wan to hear is at a very low level, and would
    require a lot of amplification. This will be difficult. You will also have
    the problem with the environmental noise.

    The output levels from these piezzo disks is very low. They need some type
    of force against them in order to generate some output. If is the sensor
    type, these are not very responsive to sounds. They are designed to pickup
    vibrations, and changes in mechanical pressure. If you are thinking of any
    type of power from them, it is going to be only a few microvolts. This level
    of supply is really useless for any practical means.

    --

    Jerry G.
    =====

    I just found out about them a week ago. First Query: Would it be
    possible to insert one into someone's clothing (So it wouldn't be
    noticable to them) to hear things like subvocalizations or other bodily
    noises, etc.? Second Query: What kind of power source do they need?
    I've heard some RFID's can run on the power of the human body itself.
    Thankis for any replies.
    -Josh
     
  4. CWatters

    CWatters Guest

    I've never heard of that fetish before. What's it called?
     
  5. Josh

    Josh Guest

    Just an idea I had. It would be creepy to hear what someone else is
    reading...
     
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