27MHz Frequency Crystal Oscillator. A 27.000.000.Hz or 27.000 KHz or 27 MHz is a component that uses a quartz crystal to generate a stable and accurate electrical signal at a frequency of 27 megahertz. It's used in electronic devices to provide a precise clock signal for tasks like timing and data synchronization. These oscillators are available in various physical packages, such as HC-49U and SMD, and are characterized by their stability, low aging, and specific load and shunt capacitance. #ree