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Why blue resistors?

Discussion in 'Electronic Design' started by blu, Apr 12, 2007.

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  1. blu

    blu Guest

    No clue as to the *real* answer, huh?

    blu 3=3
    master of irrelevance
    Lits Slut#5
    Gutter Chix0r #2
    Cancel my subscription to the resurrection.
    -Jim Morrison
  2. Harold kemp

    Harold kemp Guest

    Can anyone offer a sensible reason why 1% resistors are typically
    blue? Cheaper dye maybe?

    Everyone I know complains about reading the muddy colors. They drive
    me crazy.

    Electronics is usually a bastion of rationality. Who is responsible
    for this turd of a policy?

    Harold K.
  3. Robert Baer

    Robert Baer Guest

    It is a part of an implicit ad: the resistors are true blue!
  4. MassiveProng

    MassiveProng Guest

    It varies from brand to brand.

    There are british versions that are on a deeper than sky blue base.

    Why are you a turd of an electronics person?
  5. Phil Allison

    Phil Allison Guest

    "Harold kemp"

    ** Blue looks cool - plus is distinctive.

    ** Err - what has that got to do with pale blue under colour ??

    ** You must be kidding !!!!!!!!

    ** So what body colour is your ideal ??

    And why?


    Maybe you have marginal colour vision.

    12% of all males are legally "colour blind".

    ...... Phil
  6. MassiveProng

    MassiveProng Guest

    And a good 20% or more spell the word with an extra letter from
    hundreds of years ago, when the rest of the world has moved on to
    better word spellings. :-]

    Tee hee hee...
  7. Ross Herbert

    Ross Herbert Guest

  8. Tim Shoppa

    Tim Shoppa Guest

    1% resistors are typically (although not always) metal film. And many
    metal film resistors are coated in that pale-blue laquer or epoxy that
    you hate.

    (There are also 1% wirewounds although these tend to have numbers and
    not stripes printed on them, and they don't show up in consumer
    equipment so often, so I'm going to assume you're not talking about

    I used to believe that the blue coloring was somehow related to
    flameproof ratings (and in consumer equipment metal film resistors are
    commonly used where flameproof ratings are required by electrical
    code) but this is just a guess of mine.

    Certainly there are also a lot of metal film resistors with a brown or
    even reddish color (I'm thinking of Vishay PR01/PR02/PR03). I much
    prefer the pale blue body because none of the color stripes come close
    to that color (blue and purple stripes are much darker); I have a much
    harder time distinguishing red vs. brown (or red vs. brown vs. black)
    on the brown and red-bodied resistors especially in poor lighting.

    Doesn't matter much anyways, since almost everything new is surface-
    mount with tiny white lettering that I cannot distinguish white from
    black with! (To be fair some of the parts are laser-etched, so it's
    really just a different reflectance of black... no wonder I can't read

  9. Collour? Dipshit.
  10. MassiveProng

    MassiveProng Guest

    Varies by maker.
  11. MassiveProng

    MassiveProng Guest

    That's what magnifiers are for.
  12. Brisclecone

    Brisclecone Guest

    You're a cowardly netkop, I own you now. have you recieved any mail?
  13. Eeyore

    Eeyore Guest

    Or dark red. Or green.

  14. Eeyore

    Eeyore Guest

    Or grey, I forgot that one. Electrosil (now there's a good old name) used grey
    or was that Welwyn and Electrosil used the kind of dark ochre/red ?

  15. Eeyore

    Eeyore Guest

    Flame proof 'cement' covered Rs are typically grey IME. I have seen some with
    that dark red/ochre body too though.

  16. Eeyore

    Eeyore Guest


    COLOR is a vile American abberation.

  17. Paul Burke

    Paul Burke Guest

    Most of the axial ones I get are grey, though some are blue. But the SM
    ones are all charcoal black, with the little confusing numbers on - like
    (when they aren't just a manufacturer's code) 470 means 47 ohms, not 470

    But 0.1% S&M resistors come in a variety of entertaining colours.

    Paul Burke
  18. mpm

    mpm Guest

    I think it is to help hide the black when you over-current them.
  19. Iwo Mergler

    Iwo Mergler Guest

    The numbers just replace the color code bands. It's 47*10^0.

  20. ehsjr

    ehsjr Guest

    Yep. I can't see the difference between orange & red & brown,
    and blue & green on them. And Purple - don't get me started
    on purple. (I refuse to call it violet on those ()^# blue
    resistors.) And Yellow - what the hell is it - yellow,
    white, silver, grey, gold? Some designer color? Maybe if I
    used a magnifier... but dammit I can read a 1/8th watt carbon
    just fine.

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