2 Pin Crystals.

Discussion in 'General Electronics Chat' started by cjdelphi, Feb 20, 2011.

  1. cjdelphi

    Thread Starter New Member

    Mar 26, 2009
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    What's the fewest number of components to get a 2 pin crystal; oscillating be that 1 hertz or 1 million hertz?... I still for the life of me can't work out what causes the Crystal to do what it does in a circuit? :(

    Thanks (My understanding is off not trying to build anything /yet/) thanks.
     
  2. nerdegutta

    Moderator

    Dec 15, 2009
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  3. cjdelphi

    Thread Starter New Member

    Mar 26, 2009
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    Reading now (cheers) I'll be back once i read it 5 times and get a headache :D
     
  4. Wendy

    Moderator

    Mar 24, 2008
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    A crystal looks like several LC circuits, but is much more stable.

    By using it with an amplifier to provide feedback you can make a stable oscillator.
     
  5. bertus

    Administrator

    Apr 5, 2008
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  6. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
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    About the lowest frequency crystal you'll ever encounter is around 450 KHZ...and they're getting to be pretty hard to find. Such crystals were used as narrow I.F. filters in many post ww2 receivers.

    Any crystal works, however, because it is a mechanically resonant circuit; the crystal actually physically vibrates. In the process, it generates electrical currents at the frequency of its mechanical vibration (and also mechanically vibrates when an appropriate frequency current is applied.

    Eric
     
  7. Adjuster

    Well-Known Member

    Dec 26, 2010
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    Crystals used in clocks and watches commonly run at 32,768Hz. Although relatively uncommon, other low frequency crystals are available. They are (or were) sometimes made to order for specific equipment, such as supervisory systems for telecommunications systems.

    http://www.tfc.co.uk/products/crystals/leaded_crystals/020-002-00_low_freq_xtals.pdf
     
  8. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    The lowest crystals I know are the C2 and C4 series from epson.
    Their frequency range is from 20 kHz to about 300 kHz.
    See attached datasheet.

    Bertus
     
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