Electronics Resistors

Discussion in 'Modding' started by simon w, 12 Mar 2005.

  1. simon w

    simon w What's a Dremel?

    Joined:
    3 Nov 2003
    Posts:
    1,302
    Likes Received:
    0
    My case (Jeantech Phong) has a fanbus on the side of it and I've managed to pull one of the wires off one off :duh:

    [​IMG]

    The colours on the resistor (from right to left) are yellow, purple, brown (maybe red) and gold. After a bit of google, I think I need a 470 ohm resistor with a tolerance of ±5%. Does that sound correct? If so, where can I buy one in the UK? I had a look at maplins, but it's a difference language to me :blush:
     
    simon w, 12 Mar 2005
    #1
  2. SteveyG

    SteveyG Electromodder

    Joined:
    23 Nov 2002
    Posts:
    3,049
    Likes Received:
    8
    If it's 470R, then you need maplin part number G470R.

    If it's 4.7k (yellow, purple, red) M4K7 is what you'll want.
     
    SteveyG, 12 Mar 2005
    #2
  3. bigal

    bigal Fetch n Execute

    Joined:
    8 Oct 2004
    Posts:
    609
    Likes Received:
    0
    you can buy them everywhere, as long as you know where to fix it back onto, you can replace it with a resistor of the same markings. do you knwo the wattage? if not, better go with a .5watt (it looks about that)

    These vary from maplins 7p per resistor to rapids 60p pere 100 resistors.

    MAPLIN:

    http://www.maplin.co.uk/Module.aspx?ModuleNo=5729&TabID=1&source=15&WorldID=3&doy=12m3

    look for:

    2W RES 470R

    code:

    D470R

    still V expensive.. :sigh:
     
    bigal, 12 Mar 2005
    #3
  4. simon w

    simon w What's a Dremel?

    Joined:
    3 Nov 2003
    Posts:
    1,302
    Likes Received:
    0
    Err, nope :blush: The power for the fan it controls comes from the motherboard (3 pin) if that helps?


    Thanks guys :)


    EDIT: 1p for the resistor, £2.50 for delivery :eeek:
    Maybe I'll wait 'til Monday and ask/steal one from the electronics guru at Uni :D
     
    Last edited: 12 Mar 2005
    simon w, 12 Mar 2005
    #4
  5. ehrnam45

    ehrnam45 What's a Dremel?

    Joined:
    5 Jul 2004
    Posts:
    480
    Likes Received:
    0
    I think he's asking about the wattage of the fan being run through that resistor. ?maybe? Or perhaps if you can ID the wattage of the resistor... I didn't think there was an easy way to ID wattage on those.
     
    ehrnam45, 12 Mar 2005
    #5
  6. simon w

    simon w What's a Dremel?

    Joined:
    3 Nov 2003
    Posts:
    1,302
    Likes Received:
    0
    Oh right :blush:

    On the sticker it says 12v, 0.22A :)
     
    simon w, 12 Mar 2005
    #6
  7. cpemma

    cpemma Ecky thump

    Joined:
    27 Nov 2001
    Posts:
    12,328
    Likes Received:
    55
    Ohm's Law (& Power Law) rules. On any system, worst case (straight across the power rails) power needed is V2/R, 0.31W for 470R on a 12V system. So 0.5W or the standard Maplin 0.6W M470 would be OK, the 2W is a bit overkill. ;)

    The fan won't be inline with the resistor & pot, it will be part of a semiconductor control circuit, either inside the fan (like some Enermax fans with the control knob on the end of a wire) or something like a 317T.
     
    Last edited: 12 Mar 2005
    cpemma, 12 Mar 2005
    #7
  8. simon w

    simon w What's a Dremel?

    Joined:
    3 Nov 2003
    Posts:
    1,302
    Likes Received:
    0
    What's the difference between the M470k and the M470R?
     
    simon w, 12 Mar 2005
    #8
  9. Wrigley1

    Wrigley1 What's a Dremel?

    Joined:
    5 Dec 2004
    Posts:
    275
    Likes Received:
    0
    The 470k is four thousand seventy thousand ohms of resistance. The 470r is 470 ohms of resistance.
     
    Wrigley1, 12 Mar 2005
    #9
  10. cpemma

    cpemma Ecky thump

    Joined:
    27 Nov 2001
    Posts:
    12,328
    Likes Received:
    55
    470k = Four hundred and seventy thousand... :eyebrow:

    The resistor looks to be in series with the pot resistance, so I'd gamble on 470 ohms. Is it possible to read the pot value? Often stamped on the back.
     
    cpemma, 12 Mar 2005
    #10
  11. SteveyG

    SteveyG Electromodder

    Joined:
    23 Nov 2002
    Posts:
    3,049
    Likes Received:
    8
    The resistor is also 0.25W for definite. 0.5W are a different shape. May as well get one of each (4k7 and 470R) since they're so cheap.

    Do you have a multimeter or anything to test the resistance with?
     
    SteveyG, 12 Mar 2005
    #11
  12. simon w

    simon w What's a Dremel?

    Joined:
    3 Nov 2003
    Posts:
    1,302
    Likes Received:
    0
    Don, the electronics guy at Uni gave me a 0.25W resisitor. I installed it and everythings working again :clap:

    ty
     
    simon w, 22 Mar 2005
    #12

Share This Page