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Wiring for an external microphone on an Android phone

  1. #1
    Admin African Astronaut
    If the headphone Jack has 3 lines(4 rings) then the built in microphone on my head phones will work. Cutting apart the wiring, there are 4 wires that have covatings and then there's some copper wiring without.

    From the recording app, when I press on the wires, it appears that the wire that has no coating is the wire that is used for the microphone.

    How many wires would a microphone have?
  2. #2
    Grimace African Astronaut [my enumerable hindi guideword]
    Afraid that is going to be specific to the individual audio codec IC used for the given android phone you're talking about. The wiring in the jack might be widespread, but how it's wired back to the individual codec for a given phone is going to vary.

    What is it that you're trying to do?
  3. #3
    aldra JIDF Controlled Opposition
    Originally posted by Grimace Afraid that is going to be specific to the individual audio codec IC used for the given android phone you're talking about. The wiring in the jack might be widespread, but how it's wired back to the individual codec for a given phone is going to vary.

    What is it that you're trying to do?

    not really important if he's just planning on wiring a mic to a 3-pin micro connector

    typically the connectors will have 2 pins for speakers (L/R) and one for mic, Google up 3-pin android audio pinout for the standard
  4. #4
    Grimace African Astronaut [my enumerable hindi guideword]
    Originally posted by aldra not really important if he's just planning on wiring a mic to a 3-pin micro connector

    typically the connectors will have 2 pins for speakers (L/R) and one for mic, Google up 3-pin android audio pinout for the standard

    That's what I'm trying to figure out. I'm not really understanding what he's trying to do.
  5. #5
    Originally posted by Admin If the headphone Jack has 3 lines(4 rings) then the built in microphone on my head phones will work. Cutting apart the wiring, there are 4 wires that have covatings and then there's some copper wiring without.

    From the recording app, when I press on the wires, it appears that the wire that has no coating is the wire that is used for the microphone.

    How many wires would a microphone have?

    2. they all share common ground.
  6. #6
    Grimace African Astronaut [my enumerable hindi guideword]
    It would help if we knew:

    1: The android phone you were working with
    2. What your ultimate goal was/what you're trying to do
  7. #7
    SBTlauien African Astronaut
    1. I have multiple phones(Samsung and LG)

    2. I'm ultimately trying to wire up a magnetic strip reader

    It appears that I'll only be able to read one track though. I may try to put a small Atmel chip into the project so that I can read track 1 and track 2.

    Maybe a small battery and have it listen and read data for both track 1 and track 2 and then send track 1 followed by track 2 back to my app on the phone.

    Would I be better off just using a rPiZero?
  8. #8
    Admin African Astronaut
    I have an LG Tribute and I'm wanting to wire up a microphone for my investigations.
  9. #9
    Sophie Pedophile Tech Support

    >Investigations


    Subbed. Make a thread about hooking up pinhole cameras to androids next. Not much of a hardware person, not that kind of hardware at the very least. So i can't say anything more useful than that unfortunately.
  10. #10
    Kuntzschutz Tuskegee Airman
    https://www.cnet.com/how-to/unlock-the-secret-fm-tuner-in-your-android-phone/

    You can just use a simple FM transmitter(if your phone has that capability built in), and tune into that frequency your FM transmitter is set to. That would extend your range quite a bit more than just connecting an external mic to an android phone.

    EDIT: You can also remotely activate the transmitter using a 2$ ESP wifi module, if you want to go through the extra trouble of doing that. That way it's only transmitting when you need it to be.

    EDIT2: With a realtek SDR for like 20$ and a raspberry pi, you should be able to tune into about 5 different FM channels if I recall correctly, so potentially 5 different mics can be recorded from a remotely located transmitter. Depending on how much you know or want to learn, it wouldn't be too difficult to encrypt the transmission, so it sounds like static if anyone tunes in.
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