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Quartz Crystal stability?

Discussion in 'Electronic Basics' started by Bill Bowden, Aug 6, 2006.

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  1. Bill Bowden

    Bill Bowden Guest

    Anybody have an idea on the frequency stability of older large low
    frequency quartz crystals compared to the stability of small tunning
    fork cyrstals used in watches?

    I have an old 31.5Khz crystal in a large can that measures about 5/8 by
    3/8 inch that I tried to use in a clock application, but the error is
    not consistant and seems to vary 5 or 10 seconds a day. Some days it's
    a few seconds seconds slow, and other days it's a few seconds fast. The
    error is not consistant, so I'm thinking it may be due to temperature
    changes. The oscillator voltage is regulated so the voltage is fairly
    stable.

    Anybody have an idea of the temperature stability of the older large
    quartz crystals?

    -Bill
     
  2. Tom Biasi

    Tom Biasi Guest

    Not without seeing the specs. Of course the modern ones perform better.
    Precision crystal oscillators in "the old days" were often in crystal ovens
    to keep the drift predictable.
    Tom
     
  3. Eeyore

    Eeyore Guest

    You need the manufacturer's data. Generalities would be misleading.

    Graham
     
  4. Bill Bowden

    Bill Bowden Guest

    Yes, the specs would help, but I was thinking "bigger is better" so a
    large quartz crystal should be more stable than a smaller "tunning
    fork" variety?

    Maybe that's not a good assumption?

    -Bill
     
  5. sparc

    sparc Guest

    Whatever the reason might be for the drift ...possibly temperature as
    already guessed by him ... i wonder if it wld (almost) average out if
    we were to use 3-4 crystals and take an average frequency. Before
    everybody explodes ...this is just a thought on deriving a more
    accurate clock using a RAIC ... Redundant Array of Inexpensive Crystals
    .............

    Excusez moi ....my mind is already grinding away at the design of a
    circuit which cld average out a RAIC....
     
  6. Tom Biasi

    Tom Biasi Guest

    Crystal cut, purity, type etc. who knows?
     
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