Miscellaneous

LC Oscillator

  • Colpitts LC oscillator
  • Feedback from source of FET via C3, C4
  • C3 = C4
  • Frequency determined by L, C1, C2, C3, C4
  • L, C1, C2 can be replaced by a series tuned circuit, called Clapp oscillator
  • Temperature compensating capacitors and good mechanical construction in a practical circuit!