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4-lead ceramic resonator ?

Discussion in 'Electronic Components' started by mario, Jan 7, 2004.

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  1. mario

    mario Guest

    Hello,


    I ordered a 6 MHz ceramic resonator, and I got a thing with 4 leads?! I
    would have known what to do with 2 or 3 leads ceramic resonators, but 4 !??


    Does anyone have a clue what are these leads? They are 4 in a row, similar
    to the 3-lead resonators, but with 2 and 2 leads a bit more apart.


    thanks again for your help



    mario
     
  2. Have you asked the vendor for a data sheet? Does it have the brand
    name and part number?


    --
    We now return you to our normally scheduled programming.

    Take a look at this little cutie! ;-)
    http://home.earthlink.net/~mike.terrell/photos.html

    Michael A. Terrell
    Central Florida
     
  3. mario

    mario Guest

    Ummm... apparently it's a "frequency band filter" (translated from finnish)
    and I can't see the product code now, as I don't have a microscope handy,
    but as soon as I get home, I will read it from the part.

    However, since it's apparent that I have a ceramic band-pass filter, my
    question becomes: how can I use that as a resonator?
     
  4. I ordered a 6 MHz ceramic resonator, and I got a thing with 4 leads?! I
    My guess would be that two leads go to the resonator and two to
    internal caps, i.e. you have a cap between pins 1-2, another cap
    between pins 3-4, and the resonator is connected between pins 2-3, so
    you can use your own external caps if desired (by leaving 1 and 4 NC).

    But you need a datasheet :)
     
  5. mario

    mario Guest

    I had almost exactly the same guess, except that I thought the resonator was
    between 1 and 4. This is a deduction from the 3-lead ceramic resonators,
    where the middle lead is usually tied to ground, as there are grounding
    capacitors between leads 1&2 and 2&3, while the resonator is between the two
    extreme leads 1&3. So, I thought that in an analog way, the resonator in my
    case should be between 1 and 4.

    But, I wasn't able to make it work as an oscillator, due, probably, to a
    busted Cypress USB controller. I'll try with other permutations of the pins,
    though.
    Hey, I don't have one, sorry :eek:))) but I could see with my microscope, a
    logo: a big "C" with a capital "M" inside it. Does that ring a bell to you?

    p.s. I think there's a website with electronics manufacturer logos. Do you
    know which one it is?
     
  6. Dave Cole

    Dave Cole Guest

    Mario:
    Don't know if it's the one you saw, but one site is
    http://www.eyesurf.co.uk/~nutteing/logotext.htm

    HTH
    Good luck!
    Dave Cole
    --
    How do you tell a communist? Well,
    it's someone who reads Marx and Lenin.
    And how do you tell an anti-Communist?
    It's someone who understands Marx and Lenin.
    Ronald Reagan
     
  7. mario

    mario Guest

    Hey Dave,

    thanks for the link. No, it' wasn't this, but it's good to have anyway.

    cheers


    mario
     
  8. Graham W

    Graham W Guest

    I have a feeling that is the MuRata logo.
     
  9. mario

    mario Guest

    You are right, it's a Murata logo. I just checked one of their online
    datasheets, and indeed, the logo they use on their components is the one I
    described.

    Thanks!


    mario
     
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