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Convert telephone to microphone

Discussion in 'General Electronics Discussion' started by ayush soni, Sep 19, 2014.

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  1. ayush soni

    ayush soni

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    Aug 24, 2014
    my basic idea behind this is to use the old phone as MIC
    i think we can use its receiver as MIC & can connect it with anything like my PC & can use it as MIC




    i have a OLD phone which i dont use
    i am thinking about using it

    but i need help
     
  2. Gryd3

    Gryd3

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    Jun 25, 2014
    How do you need help? Have you tried anything yet?
     
  3. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    Phones are more than just microphones. Sounds like you want to speak into a phone and here yourself through a speaker or something like that.
    Adam
     
  4. Gryd3

    Gryd3

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    Jun 25, 2014
    I would not advise building a circuit to interface with a POTS phone, but modifying the hardware would be a good option
     
  5. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    I was not advising anything.
     
  6. Gryd3

    Gryd3

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    Jun 25, 2014
    Sorry, not meant to imply you did, but would like to nip the idea in the bud before the OP thinks it's an option.
     
  7. ayush soni

    ayush soni

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    Aug 24, 2014
    ya i was thinking about that :p
    i was thinking to use it while m calling someone with internet
    i think u get what m saying

    & as u said Phones are more than just microphones.
    i know dude :)
    i am thinking about using receiver of the phone as MIC

    like this
    [​IMG]
    or this
    [​IMG]

    &i need help in connecting receiver wire with Headphone jack
     
  8. Gryd3

    Gryd3

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    Jun 25, 2014
    Step one is identifying what wires in the jack from the handset are connected to the MIC.
    Ensure that there is not any extra hardware in the handset that could cause issues.

    Look up the pinout for a 3.5mm jack for the computer Mic Input. Connect wires together and test it out!
    You could make it a little more complex and gut the phone's base... then you could use the switch to mute your mic ;)
     
  9. ayush soni

    ayush soni

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    Aug 24, 2014
    dude i am thinking about using jack for my hands free

    & my reviver circuit is simple

    2 wires (green & red) are connected with microphone & 2 from speaker (black & yellow)
     
  10. ayush soni

    ayush soni

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    Aug 24, 2014
    here are some pics of things i have :)

    the market is far from my house so m thinking to use my old handsfree

    i also posted pics of receiver so it will be easy for you guyz to guide me :)
    100_2211.JPG 100_2214.JPG 100_2222.JPG 100_2223.JPG
     

    Attached Files:

  11. Gryd3

    Gryd3

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    Jun 25, 2014
    There's a bit of a catch!
    Take a look at that 3.5mm plug. It has 4 conductors!
    The mic input on a computer uses a plug with 3.

    (You can cut up a cord for a mic, or a cord for speakers)
    If you want to use that one, you need to determine what wire goes to what part of that plug.
    The base, is commonly the shield (ground)
    The Tip is commonly one channel (Left), and the ring below is the other channel (Right).

    For this project, you will need two 3.5mm plugs if you want to talk AND hear someone.
     
  12. ayush soni

    ayush soni

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    Aug 24, 2014
    i think i can detect in handsfree which wire is for which thing

    but y i need two 3.5mm plugs ???
     
  13. Gryd3

    Gryd3

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    Jun 25, 2014
    May have been a misunderstanding.
    You need two, if you want to use it with a computer.
    If you want to use it with a cell-phone, that will be fine.
     
  14. ayush soni

    ayush soni

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    Aug 24, 2014
    i want to use it with computer :)
     
  15. Gryd3

    Gryd3

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    Jun 25, 2014
    As far as I know, the computer does not have a mutli-purpose jack to be a mic and speaker at the same time... You need to wire your mic to a 3.5mm plug, and the speaker to another.
    Typical colors on the computer: Pink plug for Mic, Green plug for speaker.
     
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