Bioelectronics

Discussion in 'General Electronics Chat' started by joni, Oct 4, 2009.

  1. joni

    Thread Starter Member

    Oct 4, 2009
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    I want to do a project on EMG(voltage that produce in action of the muscles)
    I search after electrical circuit for the (EMG)
    I search after recommended electrodes
    I want to do this project with micro controller
    Do I need to do FFT ?
    Where I can find FFT device that I can put near the micro controller ?
    I search any information a bout (EMG) that can help me
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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  3. joni

    Thread Starter Member

    Oct 4, 2009
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    Thanks beenther
    I don't understand why I don't need to do FFT
    Also I search after more electrical circuit for the (EMG)
    And any information about (EMG) that can help me
     
  4. Dave

    Retired Moderator

    Nov 17, 2003
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    As a curiosity, what is your assertion that you do need to do an FFT.

    Dave
     
  5. joni

    Thread Starter Member

    Oct 4, 2009
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    Hallow dave
    Your question is my question
    if I know the answer I am not will ask it
    Maybe anybody here know about forums in biomedical ???
     
  6. beenthere

    Retired Moderator

    Apr 20, 2004
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    If you wish to record muscle data, then that is what you will do at the time. Later, if you wish to characterize that data, you may find that the FFT is useful.

    That decision has to be yours.
     
  7. t06afre

    AAC Fanatic!

    May 11, 2009
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    Hi Joni
    As other has mentioned some creative Gooling may provide you some useful circuits. try "electromyography circuit" or "emg circuit". But I can give you a tip that you should use circuits with FET input stage as you are doing measurement with a high source impedance. The EMG circuit is quite similar to the ECG circuit. You may or may not use a micro controller. If your circuit is some sort of school project. You may cut some corners using commercial AD board, and just build the EMG amplifier.
    And for the FFT. You do not use a FFT device. FFT is a mathematical algorithm. You implement it in software or firmware after the signal has been converted from analog to digital representation. This do not have to be so hard. Many tools like Labview or matlab have this functions the library.
     
  8. Dave

    Retired Moderator

    Nov 17, 2003
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    I'm not sure your question is my question. You have said, "I don't understand why I don't need to do FFT"; not understanding why you don't means you must have a reason why you do think you need an FFT - clarification of why you think this is what I am asking.

    It then begs the question about the system you are considering, as others have said, the FFT is an implementation of a mathematical construct, and as such resides within a system. I'm just try to get some clarity on what background research you have done before I give you a more specific answer.

    Dave