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what do I have here?

Discussion in 'General Electronics Discussion' started by (*steve*), Jan 3, 2019.

  1. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    This looks interesting. Anyone have any guesses what it is?

    1546507754234370.jpg
     
  2. davenn

    davenn Moderator

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    Sep 5, 2009

    never seen one before
     
  3. Harald Kapp

    Harald Kapp Moderator Moderator

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    davenn and hevans1944 like this.
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    It certainly could be :)

    Any guesses to the frequency?
     
  5. hevans1944

    hevans1944 Hop - AC8NS

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    Looks like the one in the video except for the octal base instead of wire leads. Would guess it resonates somewhere between 10 and 20 kHz if the video version resonates at 18 kHz. There is another link in the explanation accompanying the You-Tube video.
     
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    Unfortunately the lowest frequency I could get was 22kHz. I have another that is 52kHz.

    It seems like each crystal was individually tested. They come with a form having hand-written specifications written on it.

    1546560091873907.jpg 1546560092051231.jpg 1546560092210514.jpg 1546560092364844.jpg
     
  7. duke37

    duke37

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    Jan 9, 2011
    I have one somewhere that resonates at 100kHz. I compared it to Droitwich and could slip a cycle in more than 10sec.
     
  8. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    I got these to play with them after I saw a report on the Q of a heap of crystals. Of the huge set of crystals tested, the ones in glass bottles had the highest Q (by a large margin).

    And these are really large crystals!

    I'd like to make a low frequency ovenised oscillator just for the fun of it. It would be interesting to have the active element be a valve too :)
     
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