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Transistor frequency adjustment

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  • Transistor frequency adjustment

    Ok, i have searched a lot the net, still could not locate any single source for giving well documented clues of how a cap (variable) in conjuction to a coil (variable) in a series or parallel setup wired with a resistor (variable) at the base of a transistor could regulate its working frequency.

    Any url, table, formulae or specific data it is of help. (to calculate values and outcome)

    Baroutologos

  • #2
    Baroutologos, what I am thinking you just described would be in line with a "Band Pass" filter. With XsubC and XsubL componets, a Quiescent point would be established, allowing a certain frequency to pass.

    Hope this helps

    Bit's

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    • #3
      Lrc

      A crystal is basically an LRC circuit, is this what you mean?

      YouTube - low power high frequency xtal colpitts oscillator
      Atoms move for free. It's all about resonance and phase. Make the circuit open and build a generator.

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      • #4
        I think that is what he wants
        See:Colpitts Crystal Oscillator | Free Circuit Diagram
        for a circuit
        You have to buy a xtal for the spesific frequency you want and I am not sure what range it can be adjusted
        Last edited by nvisser; 10-17-2009, 08:08 PM.

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