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OSCILENT CORPORATION

Definitions
Series vs. Parallel
Parallel resonant crystals are intended for circuits which contain reactive components (capacitors) in the oscillator feedback loop. These circuits depend on the reactive components and the crystal to achieve the phase shift needed to start and maintain ocsillation at a specified frequency. Series resonant crystals are intended for circuits that contain no reactive components in the oscillator feedback loop. Please see Figure A for Series and Figure B for Parallel resonant crystals:

Figure A - Series Figure B - Parallel

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