In the case of the crystal oscillator, the resonator is a quartz crystal. Whenever an alternating voltage is supplied towards the crystal, it resonates in a specified frequency defined with the crystal's Actual physical dimensions. When an electrical voltage is applied to a quartz crystal, it physically deforms or vibrates. https://timing-components-for-con06283.blogripley.com/35684079/timing-components-for-consumer-electronics-no-further-a-mystery