Op Amp produces Clicking Noise

Discussion in 'General Electronics Chat' started by Daniel - RoboNoob, Apr 19, 2010.

  1. Daniel - RoboNoob

    Thread Starter Member

    May 21, 2009
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    Hi all,

    I've attached the output of an audio op amp to a pair of headphones (the input to it is an mp3 player) and I'm hearing a clicking noise in addition to the song. Does anyone know what would cause that?

    Thanks,
    DRN
     
  2. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    Reduce the volume of the mp3 player and check
     
    Last edited: Apr 19, 2010
  3. Daniel - RoboNoob

    Thread Starter Member

    May 21, 2009
    11
    0
    Thanks, but no luck :(
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
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    Headphones are a heavy load for an op amp. The clicks may be the waveform clipping. Op amps are happier with at least several hundred ohms load (the OPA134 will drive 600 ohms), and headphones are more like 32 ohms.
     
  5. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    next is that are you sure your MP3 songs are clean with clipping signals.
    Try hearing them from speaker and make sure it is clean, if they are then OPAMP supply may be too low or faulty
     
  6. ELECTRONERD

    Senior Member

    May 26, 2009
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    That doesn't make sense.

    This:
    - Indicates high impedance.

    Contradicts with this:
    - Indicates low impedance.

    Headphones for MP3 players are generally high impedance.

    Austin
     
  7. beenthere

    Retired Moderator

    Apr 20, 2004
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  8. SgtWookie

    Expert

    Jul 17, 2007
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    You're right, Beenthere - they are all over the map. Seems like 32 Ohms is popular nowadays. Back in the 70's all headphones were 8 Ohms, except for the piezo ear plugs.

    You really need to use an audio amplifier like a 386.
     
  9. ELECTRONERD

    Senior Member

    May 26, 2009
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