Quartz Crystal Blank

A quartz crystal blank is a thin, precisely dimensioned slice of synthetic quartz crystal that has been cut at a specific crystallographic orientation (such as AT-cut, SC-cut, or BT-cut) to achieve desired frequency and temperature stability characteristics. When subjected to an alternating electric field via attached electrodes, it mechanically vibrates at its natural resonant frequency due to the piezoelectric effect, providing a stable frequency reference for electronic circuits.

The quartz crystal blank operates on the piezoelectric principle: when mechanical stress is applied, it generates an electric charge, and conversely, when an electric field is applied, it undergoes mechanical deformation. In an oscillator circuit, the blank is excited by an alternating voltage, causing it to vibrate at its precise resonant frequency, which is determined by its physical dimensions, cut angle, and material properties. This vibration creates a stable electrical signal used for timing and frequency control.