Parallel-mode aperiodic crystal oscillator

  
The crystal is placed between the collector of the output stage and the base of the input stage. The frequency of oscillation can be set to a precise value with trimmer capacitor CI. The range of operation for this circuit is 500 kHz to 10 MHz
Parallel-mode aperiodic crystal oscillator - schematic

Extend the range downward (100 kHz) by increasing the value of CI to 75 pF and increasing the value of C2 to 22pF.




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