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==Crystal oscillator circuits==
[[File:RC radio crystal.jpg|right|thumb|A crystal used in hobby [[radio control]] equipment to select frequency.]]
[[File:Crystal Oscillator DIP Module Teardown.png|thumb|Inside a modern DIP package quartz crystal oscillator module.It includes a ceramic PCB base, oscillator, divider chip (/8), bypas capacitor, and an AT cut crystal.]]
The crystal oscillator circuit sustains oscillation by taking a voltage signal from the quartz [[resonator]], amplifying it, and feeding it back to the resonator. The rate of expansion and contraction of the quartz is the [[resonance|resonant]] frequency, and is determined by the cut and size of the crystal. When the energy of the generated output frequencies matches the losses in the circuit, an oscillation can be sustained.
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