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Anyone know what type of resistor this is?

Discussion in 'General Electronics Discussion' started by Teddywinters, Apr 9, 2018.

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  1. Teddywinters

    Teddywinters

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    Apr 9, 2018
    hi guys
    My controller on my coffee machine stopped working,I opened the PID box and noticed one of the risistors has blown..can anyone tell me what type of risistor it is,or a suitable replacement?

    Cheers
     

    Attached Files:

  2. AnalogKid

    AnalogKid

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    Jun 10, 2015
    Looks like 0.2 ohm, 2 W, but it is hard to tell the physical size from your photo.

    ak
     
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  3. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    20 Ohm 250ppm, possibly wire wound but difficult to tell from the picture.
    Adam
     
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  4. Teddywinters

    Teddywinters

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    Apr 9, 2018
    Thanks guys,I’ve managed to take it off the circuit board for some better pics
     

    Attached Files:

  5. AnalogKid

    AnalogKid

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    Jun 10, 2015
    Agree, 20 ohm, maybe only 1 W. The latest generation wire-wound resistors have higher power ratings in smaller package sizes. How old is it?

    ak
     
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  6. Teddywinters

    Teddywinters

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    Apr 9, 2018
    Thanks for your help AK,it’s not very old,only a few months?
     
  7. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    It's a strange one, I have not seen a ppm marking on a 5 band resistor before, it's normally on 6 bands. Unless it is 6 bands and the burnt mark is hiding the 6th band? That means it will be a different value to what I first said.
    Thanks
    Adam
     
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  8. Teddywinters

    Teddywinters

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    Apr 9, 2018
    Thanks Adam appreciate your help,it doesn’t look like a 6-band,as you can see on this pic where it didn’t burn?
    Cheers
     

    Attached Files:

  9. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    Yep you are right. Five band then.
    Cheers
    Adam
     
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  10. Teddywinters

    Teddywinters

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    Apr 9, 2018
    Thanks Adam,do you know where the best place to buy 20ohm 250ppm resistors?
     
  11. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    I am guessing it is a 2W resistor, you could measure its size and see if you can find something close. See link to RS for a guide. You might find them on eBay or Amazon if you don't want to setup an RS account.

    You can go lower than 250 ppm if you want to, it won't matter. Depends what's out there and pricing.

    https://uk.rs-online.com/web/c/pass...stor&applied-dimensions=4294860902,4294867345

    Cheers
    Adam
     
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  12. Arouse1973

    Arouse1973 Adam

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  13. bushtech

    bushtech

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    Sep 13, 2016
    Hope that component behind it isn't a charred MOV.
     
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  14. Teddywinters

    Teddywinters

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    Apr 9, 2018
    Last edited: Apr 9, 2018
    Arouse1973 likes this.
  15. Teddywinters

    Teddywinters

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    Apr 9, 2018
    I’ve had a good close look at it,and it doesn’t seem charred,but il buy a spare just in case.
    Thanks buddy!
     
  16. 73's de Edd

    73's de Edd

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    Aug 21, 2015
    Sir Theodorewinters . . . .

    Put me in that 2W line also . . . . and almost entirely expecting it to be of a laser trimmed metal film composition.
    If you were to take an ohmmeter scaled up to read 20 ohms . Touch the probes and short them out confirm your in circuit and contact resistance. Remember.
    I'll just now bet that if you would now connect both resistor ends with a jumper and connect to one of the leads and take the other meter lead and hold it in firm and constant contact with the top aluminum band of a a single edge razor blade.
    Then you gently drag to SLOWLY scrape away the paint and conformal coating at the BLACK center band of the resistor.
    I suspicion that at one point that 10 ohms plus remembered resistance will magically appear.
    Since you don't know WHAT caused this overload and typically is still being within the circuitry . . . if my HARRIER to fly . . . .I would be inserting in a 100 watt incandescent lamp . . . in place of . . .this resistor to see if it burns brilliantly------bad . . . . . . or . . . . .typically, being a bit more subdued in light output..
    This, is being before I even attempted to test out with the new resistor, and even at that, in progressively longer mere seconds of plug in time.

    73's de Edd
    .....
     
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  17. WHONOES

    WHONOES

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    May 20, 2017
    That first band looks more brown than red. I then think that the gold band is a multiplier (0.1) which then makes the resistor 0.1Ω.
    Still, I could be wrong.
     
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  18. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    Teddy as WHONOES thinks the first band might be brown, it may be worth you deciding on what colour you think it is before you buy and resistors.
    Cheers
    Adam
     
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  19. davenn

    davenn Moderator

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    Sep 5, 2009
    I totally agree and was going to make the same comment
    I think the others have "jumped the gun" on their assessment

    more like 10 Ohms rather than 20 Ohms
     
    Teddywinters likes this.
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