how to calculate values in a ceramic oscillator colpitts oscillator

Discussion in 'The Projects Forum' started by dbcooper, Jul 7, 2011.

  1. dbcooper

    Thread Starter New Member

    Jul 7, 2011
    3
    0
    am doing a project on designing a ceramic oscillator fm transmitter. am having problems finding formulae or information on calculating component required in a colpitts oscillator using varicap to modulate and a ceramic resonator. help me pliz!
     
  2. simo_x

    Member

    Dec 23, 2010
    200
    6
    I think you first should post a scheme, then someone will try to help you out.

    Regards,
    Simo
     
  3. dollat7852

    New Member

    Sep 22, 2010
    5
    0
    A colpit oscillator requires resistor capacitor, transistor and an inductor.
    The transistor is bias using voltage divider principle.
    The feedback cct is connected to the collector & it require to 2 capacitor in series parallel to an inductor & to the ground. The point of connection of the capacitor is also connected to grnd.
    F=1/(2*3.142*sqrt of LC)
    C=c1c2/c1+c2
     
  4. CDRIVE

    Senior Member

    Jul 1, 2008
    2,223
    99
    Not always and a crystal based Colpitts doesn't require and inductor either.
     
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