Electronic Stethoscope Project

Discussion in 'Homework Help' started by Baterka274, Oct 6, 2015.

  1. Baterka274

    Thread Starter New Member

    Oct 2, 2015
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    Hello,
    I have a school project and I need to construct electronic stethoscope. I could choose some designed circuit and build a stethoscope according to this scheme. I chose electronic circuit which I found on this forum. I know all values of resistors, capacitors and stuff. But I would like to ask you, if you could give me some information about the type of microphone that I can use and about parameters of this mic.
     
  2. ericgibbs

    AAC Fanatic!

    Jan 29, 2010
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  3. Baterka274

    Thread Starter New Member

    Oct 2, 2015
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    Thank you very much :)
     
  4. Baterka274

    Thread Starter New Member

    Oct 2, 2015
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    And don't you know what type of electret microphone i should choose? And I have a question: What is the function of C1and C6? Do they smooth signal? My teacher thinks that we can eliminate them but don't I need anything to achieve as much "clear" signal as it is possible?
     
  5. ericgibbs

    AAC Fanatic!

    Jan 29, 2010
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    hi,
    The function of C1 is to decouple the power rail to the electret, I would recommend that you do not remove.
    C6 is part of the power rail decoupling, I would not remove it.

    I would have thought for a medical instrument that the reduction of any stray electrical noise would be important.

    Why does your teacher think you should remove them.??

    I would choose a electret microphone that has a flat frequency response over the range of frequencies you are measuring.
     
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