Op Amp based Hartley oscillator


Posted on Feb 7, 2014

Build an oscillator that will satisfy a few requirements. The main requirement is to have exactly one capacitor. Another one is to have high Q and sine wave output. I am considering Hartley`s oscillator design. Since it has only one cap. I don`t what to built the biasing network and select a transistor that will suit the oscillator`s needs, so I figured that there


Op Amp based Hartley oscillator
Click here to download the full size of the above Circuit.

must be a way to build Hartley`s oscillator around an operational amplifier as shown on the figure below. I have made the simulation as shown above, and I believe it should oscillate, since the gain of the Op Amp negative feedback loop is greater than $frac{L1}{L2}$ ratio. But the oscillations start and die. I can see that the frequency of the decaying oscillations is correct, but they would not sustain. I event tried to crack the gain up to some unreasonable number, but this doesn`t help at all.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Amplifier Clipping Indicator
    Password Based Door Locking
    Function Generator Circuit
    ICL7107 Digital LED Voltmeter
    Ultrasonic Sensor Circuit
    Car Battery Saver Circuit
    hit the number
    Energy Leak Detector
    Run through the display circuit equipment Chengdu



    Top