please tell me what is it ? is it a capacitor or a crystal ?

Discussion in 'The Projects Forum' started by ranatungawk, Jul 17, 2010.

  1. ranatungawk

    Thread Starter Senior Member

    Oct 30, 2008
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    I’m repairing a capacitance meter. I found an item on the PCB, which is marked in red-circle in these pictures.. please tell me what is it ? is it a capacitor or a crystal ?(please see two pics )
     
  2. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    To me it looks like a crystal.
    Are there more marks on in besides the S213?

    Bertus
     
  3. ranatungawk

    Thread Starter Senior Member

    Oct 30, 2008
    147
    0
    thanks for replying !! no any marks! its a small item (pls compare the size with the resister and caps in that pics) what is the value S213 say ?
     
  4. Wendy

    Moderator

    Mar 24, 2008
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    No way of knowing from what I can see. What is the equipment?
     
  5. bertus

    Administrator

    Apr 5, 2008
    15,647
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    Hello,

    It is hard to say what the S213 means.
    Do you have a schematic of the board?
    As far as I can see it contains a hex inverter and two counters.

    Bertus
     
  6. beenthere

    Retired Moderator

    Apr 20, 2004
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    The cylinder suggest a 32,768 Hz RTC crystal.
     
  7. BMorse

    Senior Member

    Sep 26, 2009
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    I second Beenthere, those are typical for a RTC crystal.... most like used for a clock source ...

    B. Morse
     
  8. Wendy

    Moderator

    Mar 24, 2008
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    That was my impression, but I wasn't sure enough to say so. It could be a different frequency very easily.
     
  9. JoeJester

    AAC Fanatic!

    Apr 26, 2005
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    Trace it out and show where the two connections go .... that might give a better clue on the component.
     
  10. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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    In association with a pair of counters (4518s), a hex inverter (4069) a couple of small caps (22pF and 47pF), my bet is on a crystal too.

    Ken
     
  11. SgtWookie

    Expert

    Jul 17, 2007
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    Gee, I wonder what happened to my reply? This thread disappeared for awhile yesterday after I replied, and now it's gone? Server crash, perhaps?

    I'm in agreement with Ken; the 22pF and 47pF caps in conjunction with the resistors and close proximity of the 4069 hex inverter suggest a typical crystal oscillator drive circuit.
     
  12. tom66

    Senior Member

    May 9, 2009
    2,613
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    If you have an oscilloscope power up the device and measure the crystal. If the meter is not totally fried the crystal should oscillate, giving you your frequency.
     
  13. bc108

    New Member

    Jul 18, 2010
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