20_MHz_VHF_CRYSTAL_OSCILLATOR_Circuit Diagram World 
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2016-08-31 09:38  
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A typical circuit at 20 MHz is shown. The crystal, which has an internal series resistance RS, of 14 Ω , oscillates at its third harmonic. The diode clamp D1 and D2 provides a constant amplitude control. The transistor operates continuously in a linear mode over a complete cycle of oscillation, and reflects a reasonably constant load across the crystal at an times.