What happens if I change an oscillator's load capacitance from 15pF to 30pF?

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stepa
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What happens if I'm changing load capacitance of oscillator from 15pF to 30pF.
 
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That will "bend" (change) the oscillation frequency slightly. You should stay with the recommended capacitance when designing a crystal oscillator -- see the crystal's datasheet for the correct capacitance to use.