10ohm chip on Navi 2.0 for External Compass

Discussion in 'Electronics' started by Gary McCready, Apr 5, 2015.

  1. Gary McCready

    Gary McCready Active Member

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    I bought a Navi 2.0 and an External Compass from QC a while back. The last Navi I upgraded had a very small surface mount chip, similar to the Wiki pic.
    This Navi 2.0 had a much larger (4x bigger) loose chip included labeled 22-10L. At first i thought it had fallen off the baord but a careful inspection said not.
    Can I assume that this is the 10nf (10 ohm?) chip I need for the External Compass, and does it matter which way positive and negative faces? Obscure question I know, but I have no clue.
    Thanks,
    gary
     
  2. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    Gary: if you don't get any answer here (and I certainly don't know the answer), you might want to post on the mikrokopter.de forum if you've not already done so.

    Andy.
     
  3. Gary McCready

    Gary McCready Active Member

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    I don't even think Quadrocopter knows. I just got an answer "we don't include loose chips in our shipments"... lol
    I might just ask my son, the electrical engineer, what I need. They have to be dirt cheap. I just don't know what ohm and voltage I need.
     
  4. Steve Maller

    Steve Maller UAV Grief Counselor

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  5. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    Good find, Steve.
    Gary: Scroll down on that web page until you see "anti-noise capacitor A small capacitor must be soldered to the pins on the Navi-Ctrl 2.0"

    I'm afraid QC does ship loose chips -- they just didn't realize it. :)

    Andy.
     
  6. Gary Haynes

    Gary Haynes Administrator
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    And if it is a cap then they typically do need to be installed in the correct direction.
     
  7. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    Hi Gary: For electrolytic caps (such as you find on ESCs) you're absolutely correct. For ceramic capacitors (typically used for really small capacitance values), they're not polarized -- given the size (that is the capacitance), this one could be ceramic so will not be polarized. The last image at http://wiki.mikrokopter.de/en/ExternalCompass is labelled with 10-22nF (nanoFarads) with is a pretty small capacitance typically used to block noise.

    See http://en.wikipedia.org/wiki/Ceramic_capacitor (scroll down to the images of MLCC capacitors).

    Just to be perverse, there is a small chance that it's a tantalum *polarized* capacitor, in which case see http://en.wikipedia.org/wiki/Tantalum_capacitor#Polarity_marking that shows an image of how to recognize the +ve end.

    Andy.
     
  8. Gary McCready

    Gary McCready Active Member

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    Thanks guys! Yea, I have two Navi 2.0 Boards with the External compass and the very small surface mount capacitor. I bought this last one (Navi 2.0) on sale, as "previously used" last fall, and it had this larger capacitor in the bag, and nothing in the External Compass bag, not even a cable. I'm sure I can just buy a 10-22nF somewhere, very small, very cheap. Probably have to buy 10? lol I ordered a 25cm cable from QC last week but couldn't realized till now the capacitor was very different from the other two.
    It says 22-10L on the top line and C4 then a 2 in a circle on the bottom row. There is also a white strip on the left side, which amde me think it might be polarized.
    As I said, my son has his Masters in electrical engineering. I'm sure he can get me an answer, if I can get up with him. lol
    As far as the QC response: Guess they don't remember sending me all those MK parts we had to soldier ourselves back in the dark ages...3-4 years ago. lol
    It looks more like the first black one in this picture. (6th from left)
    http://en.wikipedia.org/wiki/Tantalum_capacitor#/media/File:Polarity-rectangular-chips.jpg
    Instead of this one:
    http://www.eriintlcapacitors.com/se...smd_smt_0603_10uf_6_3volts_x5r_20-285455.html
    This might do? $2 on ebay....lol
    http://www.ebay.com/itm/10nF-50v-20...806?pt=LH_DefaultDomain_0&hash=item233bb6623e
     

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