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How to make, where to buy, order 5 kHz, 10 kHz, 15 kHz crystal/ ceramic resonators

Discussion in 'Electronic Components' started by la-la, Nov 15, 2006.

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  1. la-la

    la-la Guest

    Hi,

    how to make a crystal /ceramic oscilator for a specicfied frequency in
    kHz range ?
    Is it posssible to make one on myself, or find someone to make it ?
    What is a minimum order quantity for a crystal/c eramic resonator for a
    specified frequency (kHz) ?
    Please help me.
     
  2. Meat Plow

    Meat Plow Guest

    http://www.qth.com/inrad/
     
  3. Rich Grise

    Rich Grise Guest

    Try a CD4060 - http://www.fairchildsemi.com/ds/CD/CD4060BC.pdf

    Then you can use a sane crystal freq. ;-)

    Or, you could look into "tuning fork crystals", which is the type of the
    32.768KHz crystal in your wristwatch.

    Good Luck!
    Rich
     
  4. We have many tens of thousands of crystal oscillator modules in stock at
    fifty cents each.

    Our lowest frequencies are 28.8 kHz, 108 kHz, 153.6 kHz, 250 kHz, 256
    kHz, 307.2 kHz, 326.4 kHz plus hundreds of higher frequencies.

    In general, it is usually cheaper and simpler to use a higher frequency
    and a CMOS binary divider.

    Also in general, if your system does not use a crystal frequency of
    32.768 kHz or 3.59545 MHz, you should flush it and start over.



    --
    Many thanks,

    Don Lancaster voice phone: (928)428-4073
    Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
    rss: http://www.tinaja.com/whtnu.xml email:

    Please visit my GURU's LAIR web site at http://www.tinaja.com
     
  5. Oops.

    Should be 3.579545 of course.


    --
    Many thanks,

    Don Lancaster voice phone: (928)428-4073
    Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
    rss: http://www.tinaja.com/whtnu.xml email:

    Please visit my GURU's LAIR web site at http://www.tinaja.com
     
  6. Poor guy ;-)
     
  7. Robert

    Robert Guest

    32.768 kHz is 2^15 Hz

    Where does 3.579545 MHz come from?
     
  8. Rich Grise

    Rich Grise Guest

    TV color burst.

    Cheers!
    Rich
     

  9. NTSC color burst.


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     

  10. So, if I need a 4 MHz clock for a CPU, I should scrap it and make it a
    lot more complex to use a color burst crystal? How about those 10- MHz
    frequency standards? Show me a SIMPLE design for a TCXO to proved a low
    distortion 10 MHz signal from a 3.5795454545 crystal. Yes, i know that
    it can be done, but why? There are dozens of common, off the shelf
    crystal frequencies that are dirt cheap.



    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  11. Hal Murray

    Hal Murray Guest

    32.768 kHz is 2^15 Hz
    TV color burst.
     
  12. Guest

    The speed of sound in quartz is (depending on shear vs. compression
    wave)
    400 to 600 m/second; so a quartz slab resonant at 3.579 MHz is a tenth
    of
    a millimeter thick. Those (AT cut typically) are mass-produced for
    television
    sets, and are inexpensive and available off the shelf.

    At 15 kHz, an AT quartz resonator would need to be (in size) about 200
    times that,
    2 cm thick (and broader than it is thick, so it'd be a Frisbee-sized
    disk). They don't
    make those, as far as I know. Normal mortals couldn't afford one.

    For wristwatches, a tuning-fork is used, and one can micromachine it
    from quartz
    and laser-trim its weighted tines for frequency and couple to it using
    the quartz
    material's piezoelectric properties. Those are mechanical oscillators
    with
    non-quartz parts, but they still get called 'quartz resonators'. The
    common
    frequencies are mass-produced, and that means 32.000 kHz and 32.768
    are available, but not the lower frequencies you ask about.

    The typical resonators used for 5 kHz are tuning forks and guitar
    strings, or they
    aren't mechanical at all...
     
  13. Color burst frequence in NTSC signals...

    Charlie
     
  14. Tom Bruhns

    Tom Bruhns Guest

    The colour subcarrier of NTSC-encoded colour television broadcasts.
    The crystals, being very common at least in the USA, are cheap. FWIW,
    the NTSC colour subcarrier is nominally at 63/176 times 10MHz (with a
    tolerance of +/-10Hz; usually kept much closer to the nominal than the
    tolerance would allow), the horizontal scan frequency is 2/455 times
    the colour subcarrier frequency, and the vertical scan frequency is
    2/525 times the horizontal scan frequency. Expect that the scan
    frequency ratios to the colour subcarrier will be exact at least in any
    broadcast signal, to get proper interlace.

    There are other "inexpensive" crystal frequencies. Low kHz
    frequencies, of course, are not among them, but accurate generation of
    low kHz frequencies is possible through division from higher crystal
    frequencies.

    Cheers,
    Tom
     
  15. Joel Kolstad

    Joel Kolstad Guest

    Not all of us are trying to build TV Typewriters for $5 or less, Don. :)

    But if you can find me some way to get VHF and low UHF signals down to a 45MHz
    IF with 32kHz and colorburst crystals, I'd love to hear it!
     
  16. Joel Kolstad

    Joel Kolstad Guest

  17. Joel Kolstad

    Joel Kolstad Guest

    More information on exactly why 3.579545MHz was chosen:
    http://en.wikipedia.org/wiki/NTSC (see the "color encoding" section)
     
  18. Guest

    This guy came close , quartz ring, not a frisbee, but close :

    http://www.btinternet.com/~time.lord/QuartzRings.html

    Steve Roberts
     
  19. Rich Grise

    Rich Grise Guest

    But color burst crystals are free, if the neighbor tosses their TV. ;-)

    Cheers!
    Rich
     
  20. Rich Grise

    Rich Grise Guest

    Ah, HA! At last!
    "The remaining vertical blanking interval lines are typically used for
    datacasting or ancillary data such as video editing timestamps (vertical
    interval timecodes or SMPTE timecodes on lines 12-14 [3] [4]), test data
    on lines 17-18, a network source code on line 20 and closed captioning,
    XDS and V-chip data on line 21. Early teletext applications also used
    vertical blanking interval lines 14-18 and 20, but teletext over NTSC was
    never widely adopted by viewers [5]."

    Anyone for a commercial skipper? I think I might hack into my TeeVee, and
    sync up line 20 and see if there's any predictable change when they go
    to commercial. "Network source code"? Sounds fascinating!

    I wonder where I'd look up the coding protocol?

    Cheers!
    Rich
     
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