A crystal oscillator is an electronic circuit that uses the mechanical resonance of a vibrating crystal of piezoelectric material to create an electrical signal with a very precise frequency. This frequency is commonly used to provide a stable clock signal for digital integrated circuits, and to stabilize frequencies for radio transmitters/receivers. Below is a list of crystal oscillator suppliers.

• Z-Communications, Inc.
• ILSI America
• CTS
• HD Communications, Inc.
• Micronetics
• Raltron
• Emhiser Micro-Tech
• Frequency Management
• Fox Electronics
• Micro Networks
• Mini-Circuits
• Microwave Dynamics
• Valpey Fisher
• Dove Electronic