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Ask an Expert Forum Which surface mount resistor is this?
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Which surface mount resistor is this?

hafcanadian
hafcanadian over 10 years ago

I can't find a local source for a SMR that somehow got knocked off an outdoor solar lantern's PCB while I was trying to refurbish it.  Thankfully I had another device and could look to see which one it was.  But I can't figure out what to order online.  I took both devices to a well-known local electronics store, but the tech at the counter looked at the intact one with a magnifying glass but couldn't tell me which SMR I needed either. 
The numbers on it are either 1101 or 1011.  I can't tell which direction to read it, and am no electronics expert by any means.  Attached are photos of the intact and functional PCB.  The SMR I need another of is in position R3.  Can anyone advise me which one of many offered by Element 14's catalog is correct?

 

Thanks,

Joel

imageimage

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  • mcb1
    mcb1 over 10 years ago in reply to hafcanadian +2
    I take it that it doesn't matter in this application what the resistor's specifications are, such as milliwatts, voltage, case style? In this application probably not... EXCEPT the case style needs…
  • Robert Peter Oakes
    Robert Peter Oakes over 10 years ago +1 verified
    It is either a 1.1k or a 1.01k and I would think either would work in your circuit Regards
  • mcb1
    mcb1 over 10 years ago in reply to Robert Peter Oakes +1 suggested
    You should also be able to measure it. If you really wanted, a small cut on the track below or right of the silkscreen R3 would isolate it. The cut is easy to fix with some solder. Mark
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  • gadget.iom
    0 gadget.iom over 10 years ago

    I would agree with Robert Peter Oakes on this one...

     

    These unsoldered terminals make me shudder:

    image

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  • hafcanadian
    0 hafcanadian over 10 years ago in reply to gadget.iom

    Thanks Peter and Paul.  Those aren't unsoldered terminals;  the two at each end are guide pins at either end of a slide switch housing on the other side of the board.  Two in the middle are contact pins for "ON" and the third unsoldered one is for the "OFF" position contact.

     

    The only shuddering necessary is if you were to see my earlier greenhorn soldering attempts on the other PCB that has the missing surface mount resistor.  When I get a new SMR for it, I'll try to use my new Hakko iron, 65/35 solder, flux pen and flux remover pen, and hopefully better technique to clean that mess up.  With age has come a tremor that makes fine-circuit soldering particularly difficult, even with "helping hands"/magnifier, so results aren't always as pretty as I'd like.

     

    I guess I'll go for one of the "1101" resistors in Newark's catalog.  I take it that it doesn't matter in this application what the resistor's specifications are, such as milliwatts, voltage, case style?   http://www.newark.com/webapp/wcs/stores/servlet/Search?catalogId=15003&langId=-1&storeId=10194&gs=true&st=surface%20mount%20resistor%201101

     

    Joel

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  • gadget.iom
    0 gadget.iom over 10 years ago in reply to hafcanadian

    I personally prefer all contacts to be soldered on a switch. If only to increase the mechanical durability.

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  • gadget.iom
    0 gadget.iom over 10 years ago in reply to hafcanadian

    I personally prefer all contacts to be soldered on a switch. If only to increase the mechanical durability.

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