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Finding the beep!

Discussion in 'General Electronics Discussion' started by Haych, Jun 17, 2014.

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  1. Haych

    Haych

    4
    0
    Jun 17, 2014
    Hi all,

    I have this circuit which is a NFC charger.

    It makes a beep every time it contacts the phone, can anyone tell me where it is so I can rip it off?

    Thanks

    H
     

    Attached Files:

  2. davenn

    davenn Moderator

    13,883
    1,966
    Sep 5, 2009
    hi there Haych

    welcome to the forums :)

    Don't see anything obvious there that would bake a beep

    must be on the other side of the board ??
    dismantle and take a photo

    Dave
     
  3. Haych

    Haych

    4
    0
    Jun 17, 2014
    Hi Dave,

    On the other side is just the coils for the charger.

    Hmmmmmmmm....
     
  4. davenn

    davenn Moderator

    13,883
    1,966
    Sep 5, 2009
    in that case ... silly question ... you sure its the charger beeping and not the phone ??

    "coils for the charger " ??

    humour me, show me a pic anyway :)

    cheers
    Dave
     
  5. Haych

    Haych

    4
    0
    Jun 17, 2014
    Here is the other side. Hope this helps you understand.

    It's definitely not the charger making the noise as it's just a USB cable.
     

    Attached Files:

  6. OLIVE2222

    OLIVE2222

    690
    25
    Oct 2, 2011
    J1 looks to be the beeper. He is probably driven by the NE555 pin 3, to be checked.
     
  7. Haych

    Haych

    4
    0
    Jun 17, 2014
    You are a legend! Thanks. I just took the head off it and the speaker doesn't beep anymore.

    Thanks again!
     
  8. davenn

    davenn Moderator

    13,883
    1,966
    Sep 5, 2009
    I did consider that, but decided it looks more like a ferrite cased inductor

    Dave
     
  9. davenn

    davenn Moderator

    13,883
    1,966
    Sep 5, 2009
    nice one :)
     
  10. OLIVE2222

    OLIVE2222

    690
    25
    Oct 2, 2011
    You welcome, but being thanked to make something fail, what a shame ! :D
     
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