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Anyone Need these Ceramic Resonators?

Discussion in 'Buy, Sell and Trade' started by chemelec, Jan 1, 2018.

  1. chemelec

    chemelec Well-Known Member

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    These are Ceramic Resonators.

    I have Hundreds of them in these Frequencies.
    They are FREE, Except for the Shipping Cost.
    (Shipping Cost Depends on the Weight of Parcel and Your Location. *I Mail out from Canada*)

    I Can't say much for their: +/- 1KHz though
    Measuring 3 of the 305 ones, I get a Frequency of 293 KHz on all 3 of them.
    Similar Off-Frequency Readings on the Other ones also.
    Other than That, They seem Stable.


    Crystal Resonators-1.JPG
     
    Last edited: Jan 2, 2018
  2. unclejed613

    unclejed613 Well-Known Member

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    interesting... there are two effects that occur at different frequencies. Fa is the parallel resonant frequency which is the frequency that the crystal is a high impedance, and Fr which is the series resonant frequency, where the crystal is a low impedance. if you connect a signal generator across the crystal. and connect the oscope across it as well, there will be a frequency where the voltage peaks, this is Fa, and there will be a frequency where the voltage dips, that is Fr. Fr is lower than Fa
     
  3. chemelec

    chemelec Well-Known Member

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    I didn't Notice any PEAK on the scope, Just Shorted out the signal at resonance.
     
  4. dave miyares

    Dave New Member

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  5. unclejed613

    unclejed613 Well-Known Member

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    that's the series resonant point... sometimes it's hard to see the parallel resonant point. an RF sweep generator (or a signal generator with a wide FM modulator) might be useful in plotting it.

    or build an oscillator and see what frequency they oscillate at http://www.circuitstoday.com/crystal-oscillator

    there's two oscillators there, one for series, and one for parallel resonant modes.
     
    Last edited: Mar 20, 2018
  6. chemelec

    chemelec Well-Known Member

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    Well I don't have any use for them, So I can't be bothered in Checking them further.
    Seems no one else wants them either, so they will soon just go in the GARBAGE CAN.
     

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