Lower Q of Crystal or Ceramic Resonator

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SUMMARY

The discussion focuses on the challenge of lowering the Q factor of ceramic or crystal oscillators for a school project involving an RF oscillator operating at approximately 100kHz. The participant inquires about using resistors in series or parallel with the oscillators to achieve this goal. Additionally, a suggestion is made to explore existing designs, specifically referencing a UJT-based quench oscillator as a potential solution. The project context involves a super-regenerative receiver, which influences the choice of oscillators.

PREREQUISITES
  • Understanding of RF oscillator design principles
  • Knowledge of Q factor and its implications in oscillators
  • Familiarity with ceramic and crystal oscillators
  • Basic electronics skills, particularly with resistors and feedback circuits
NEXT STEPS
  • Research methods to lower Q factor in oscillators, including resistor configurations
  • Explore UJT-based quench oscillators for RF applications
  • Investigate the design and functionality of super-regenerative receivers
  • Study the impact of component selection on oscillator performance
USEFUL FOR

Electronics students, RF engineers, and hobbyists working on oscillator design projects, particularly those involving super-regenerative receivers.

Fischer777
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I'm working on a school project that requires me to build a RF oscillator that is able to be started and stopped at about 100kHz. Ceramic or crystal oscillators would be good because of their tiny size, however, the high Q factor creates a problem. So my question was, can placing a resistor in series/parallel with a ceramic or crystal oscillator work to lower its Q? Or some other method? The project utilizes a super-regenerative receiver, so that limits the kind of oscillators to feedback.

Thanks
 
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Hi Fischer777. I can't answer your specific question, I'll leave that for others to address.

I confess I'm not as brave as you. I'd look around at the work of others who have gone before, and I'd adopt something emerging from their toil. For example, a quick search found this design with a UJT-based quench oscillator:- http://members.iinet.net.au/~cool386/6tr/srrx.html

Good luck with the team project!
 
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