Crystal Oscillator Resonator RF Filter Made From Quartz In the crystal oscillator (SMD), the ordinary active oscillator has 4 pins, and the differential crystal oscillator has 6 pins. Is a complete oscillator, in addition to the quartz crystal, there are transistors and resistance capacitance elements. Crystal oscillator is also known as active crystal oscillator, active crystal oscillator is divided into DIP direct crystal oscillator and SMD...