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100 KHz tuning fork crystal oscillator

Discussion in 'Electronic Design' started by Andrew Holme, Apr 24, 2008.

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  1. Andrew Holme

    Andrew Holme Guest

    I want to build a phase-lockable VCXO using one of these tiny 100 KHz tuning
    fork (cylinder-type) crystals:

    I've got it to oscillate using the classic unbuffered CMOS inverter circuit
    with a 5V supply, two 33pF loading caps, 1M feedback resistor and 100k
    current-limiting resistor. This may still be too much drive - the datasheet
    says 1uW max.

    Is this a suitable circuit for these crystals? Can anyone recommend a
    better circuit?

  2. Mark

    Mark Guest

    that was the easy part..

    now how are you going to make it voltage controlled?

  3. Joerg

    Joerg Guest

    'tis why varicap diodes were invented. But you'll have to use another
    inverter (preferably a Schmitt) and some discretes to provide 15V or so.
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