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Qucs crystal help

Discussion in 'Circuit Simulation & PCB Design' started by be80be, Nov 14, 2017.

  1. be80be

    be80be Well-Known Member

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    I been playing with qucs it's cool but a can't find a crystal I wan't to test ideas with a crystal.
    Can anyone point me to the right place. Thanks.
     
  2. jpanhalt

    jpanhalt Well-Known Member Most Helpful Member

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    LTSpice (at least my version) doesn't have a crystal model per se. It has a crystal symbol, but you have to assign the various values for inductance, capacitance, and resistamce:
    upload_2017-11-14_22-57-50.png

    If you can't find a "proper" symbol in qucs, you might consider just using a capacitor symbol and specifying those characteristics.

    John
     
    Last edited: Nov 14, 2017
  3. be80be

    be80be Well-Known Member

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    I guess qucs is like ltspice I said you can use stuff from it I don't have the hang of it.
    But it works so so I wanted to use LTspice but this is a linx box.
     
  4. dave

    Dave New Member

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  5. BobW

    BobW Active Member

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    I've set up my own QUCS model for a crystal using the standard equivalent circuit. The attached example is for a 38 kHz tuning fork crystal. The parameters came from the manufacturer's datasheet. Note the extremely high inductance value. This is normal for a crystal.
    Xtal_38kHz.png
     
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  6. be80be

    be80be Well-Known Member

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    Thanks bobw an jpanhalt
     

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