Sonar sensor

Discussion in 'The Projects Forum' started by Jason78, May 26, 2016.

  1. Jason78

    Thread Starter New Member

    May 26, 2016
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    Hi thanks for letting me join , I am looking to identify this image?
    I recently opened up the sensor to my fish finder and in doing so damaged this component .
    I am desperate to try and find a matching product and repair the sensor .
    Any help gratefully received .​
     
  2. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    Welcome to AAC!
    What are the markings on the sensor?
     
  3. Jason78

    Thread Starter New Member

    May 26, 2016
    17
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    Hi Alec

    The markings are M3 100g zr

    I have attached an image of the unit it came from if that helps .
     
  4. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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    That looks eerily similar to a surface mount capacitor....
     
  5. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    I have taken the pictures from you opening post and taken away all irrelevant space:

    Jason78_sensor_1.jpg

    Jason78_sensor_2.jpg

    Bertus
     
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  6. Jason78

    Thread Starter New Member

    May 26, 2016
    17
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    Any way of confirming this kermit ?
     
  7. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
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  8. Jason78

    Thread Starter New Member

    May 26, 2016
    17
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    John I think you have cracked it mate Just need to find a supplier of the one I require now .

    Thank you
     
  9. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
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    Nichron is a very big supplier, but you do not need that brand. And, any voltage ≥4V that will fit will work fine. You may find 6.3 volt more common.

    SMD electrolytics do not save much space. I have used regular radial-lead electrolytics as replacements. Just bend the leads to right angles.

    John
     
  10. Jason78

    Thread Starter New Member

    May 26, 2016
    17
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    John

    I found an ideal match through eBay from Germany .
    Thanks for your help guys it's appreciated , one more question due to the shape of the capacitor is there an easy way to Salder them in place ?
    The contacts are hidden under a plastic frame and I don't want to make a mess of said frame with the soldering iron ?

    Thanks guys
     
  11. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
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    Soldering SMD electrolytic caps take a little skill, but not much. It is like soldering any other device with pads under the device. Be sure the joint is hot enough and use a good-flowing solder. I suggested the radial lead version, as that may be easier for you to solder , if you lack experience.

    John
     
  12. Jason78

    Thread Starter New Member

    May 26, 2016
    17
    1
    Thank you guys for all your help with .

    I will let you know how it goes when they arrive .
     
  13. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    When mounting the capacitor keep track of the orientation:

    Jason78_sensor_3b.png

    Bertus
     
  14. Jason78

    Thread Starter New Member

    May 26, 2016
    17
    1
    Thanks bertus

    Do they have + and - markings on the capacitor?
    Or is there a trick of the trade I need to be aware of ?

    Thanks
     
  15. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    On the picture jpanhalt posted and the picture of the diveice show a black bar on the capacitor.
    Keep the black bar on the same side.

    Bertus
     
  16. Jason78

    Thread Starter New Member

    May 26, 2016
    17
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    Fantastic

    Thanks for this bertus


    Jay
     
  17. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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    The black bar indicates the negative leg of capacitor. If you need to verify it's orientation on the board, use an ohm meter to find out which solder pad is "ground". (Only if it is not a positive ground circuit, which is not very common but they DO exist so keep that in mind)
    The black bar side of the undamaged capacitor should ohm out with the proper negative pad of the one you are replacing. That is where I would start checking first.
     
  18. Jason78

    Thread Starter New Member

    May 26, 2016
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    Thanks kermit2
     
  19. RichardO

    Well-Known Member

    May 4, 2013
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    If you look at the silkscreen outline for the capacitor you will see that 2 corners are "clipped" The capacitor should have a plastic base with the same shape. Just install the new cap with the same orientation as the sikscreen.
     
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