Oscillator Confusion

Discussion in 'General Electronics Chat' started by BladVat, Jun 16, 2014.

  1. BladVat

    Thread Starter New Member

    Jun 16, 2014
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    0
    Hello Forum,

    This is my first post so I'm sorry if I've messed up anywhere! :confused:

    I'm planning on adding a QC resonator and a SPDT switch into an old GameBoy Advance to see if I can do some mild overclocking. However, upon looking at the SMD crystal, it appears to have well over 2 pins! Now if I understand correctly, there is some additional circuitry in there which probably accounts for more pins, but where do I solder my measly 2 pin through-hole (obviously I won't use it as a through-hole, but just to give some context) resonator? Any help would be appreciated, but I would also like to know what the other pins' functions are so that I can have a slight clue about what goes where.

    Thanks again,
    BladVat
     
  2. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,392
    1,606
    Hello BladVat.

    Do you have the part number of your mystery crystal? Without that it is anyone's guess what the pins do.
     
  3. BladVat

    Thread Starter New Member

    Jun 16, 2014
    4
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    Hi ErnieM,

    The part number is KDS 0114 (4.194MHz).

    BladVat
     
  4. Papabravo

    Expert

    Feb 24, 2006
    10,147
    1,791
    It might be more than a crystal. It might be a clock oscillator with power, ground, and an enable. Replace one of those with a resonator and pffft -- nothing works.
     
  5. BladVat

    Thread Starter New Member

    Jun 16, 2014
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    Right, I had a feeling it would be something like that. But are there 2 pins that I could 'piggy-back' whilst leaving the current mystery clock in place? That's why I was of looking for a pinout schematic of some kind.

    Cheers.
     
  6. AnalogKid

    Distinguished Member

    Aug 1, 2013
    4,542
    1,251
    I found the forum thread with the mod description and photos:

    http://forums.benheck.com/viewtopic.php?t=25718

    My guess is that it is a complete oscillator, not just a crystal, and the only reason this works (sometimes, according to the thread) is that the original osc and the new xtal are approx 2:1 in freq and the crystal is ringing badly enough to generate extra clock pulses. Doesn't quite make sense given the low output impedance of the osc, but that's all I got.

    ak
     
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  7. BladVat

    Thread Starter New Member

    Jun 16, 2014
    4
    0
    Cheers for the help.

    So I guess there's no surefire way to hook up a quick OC switch without specific frequencies etc? Seems a bit hit-and-miss.

    BladVat
     
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