What standard resistor values to buy? (In bulk)

Discussion in 'General Electronics Chat' started by TheLaw, Jul 11, 2011.

  1. TheLaw

    Thread Starter Member

    Sep 2, 2010
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    2
    I'm hoping to stock up on some resistors.

    I'm hoping to keep it as simple as possible. Should I just go with multiples of 10? Or should I do 1, 4.7, 10, 47, 100?

    Thanks.

    Edit: This should probably be in resources...
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,415
    3,354
    It depends on whether you will be doing a lot of analog work or just digital.

    With digital you may get by with just 100, 1K, 10K, 100K and 1M.
    You may need some 10M across XTAL oscillators.

    With analog, the standard 5% set values are commonly used:

    1.0
    1.2
    1.5
    2.2
    2.7
    3.3
    3.9
    4.7
    5.6
    6.8
    7.5
    8.2
    9.1

    If I were starting out I would get these in the following ranges
    x100, x1K, x10k, x100K (assuming that you can buy these as a set or in bulk at discounted prices).

    If not, I would limit the 100K values and up to:
    100K
    220K
    330K
    470K
    1M
    10M
    22M

    Below 100 ohm I would choose:
    10
    47

    The values I use the most are 1K, 10K and 100K.
     
  3. KJ6EAD

    Senior Member

    Apr 30, 2011
    1,425
    363
    Last edited: Jul 11, 2011
    PackratKing likes this.
  4. TheLaw

    Thread Starter Member

    Sep 2, 2010
    228
    2
    Thank you for all for the information. Yes, I think E6 should be adequate for now. Maybe I'll get E12 in the future. Anything above that...I think I'll just order on demand, if I really need them.

    I guess I'll go with carbon composition, as much as I hate them.
     
  5. #12

    Expert

    Nov 30, 2010
    16,248
    6,745
    Something strikes me as wrong about that. Metal film and carbon film seem to be available.

    Mouser
    Carbon film 5.8 cents ea. in quantities of 10
     
  6. TheLaw

    Thread Starter Member

    Sep 2, 2010
    228
    2
    Whooopss. My mistake. I mean't carbon film. Carbon comp is like a 60 year old technology...and they're expensive.

    I'd much rather stock metal films, but I'd have to buy 100s at a time to get close to the price of a carbon film.
     
  7. #12

    Expert

    Nov 30, 2010
    16,248
    6,745
    Assuming 5% and 1/2 watt
    Metal oxide, 7 cents each, Mouser
    metal film, 5 cents @ 1/4 watt or 1/2 watt, Mouser
     
  8. TheLaw

    Thread Starter Member

    Sep 2, 2010
    228
    2
    =O

    I think I'll try some metal films then. The 1%s don't even seem to far off in most cases, but carbon films are much cheaper if I buy in bulk...which I'm considering. Is it bad to buy say 100s now, and use them maybe in 10 years?
     
  9. #12

    Expert

    Nov 30, 2010
    16,248
    6,745
    Just for stock, I buy 10 of each value.
    When I know I have a project that uses, say, 5 volts and LEDs, I'll buy a bunch of 270's because I like to use 10 ma for my LEDs.
    I tend to use a lot of 270k with vacuum tubes.

    Values less than 1 ohm usually need to be 1 watt or larger.
    I have (8) 2 ohm, 25 watt resistors held in a block with zip-ties so I can make any speaker load I want.
     
    Last edited: Jul 12, 2011
  10. TheLaw

    Thread Starter Member

    Sep 2, 2010
    228
    2
    Thank you. I'll try to put all of the suggestions together to make a nice complete kit.
     
  11. gerty

    AAC Fanatic!

    Aug 30, 2007
    1,153
    304
    I get mine at Jameco.com, they are $2 per hundred (of the same value) 1/4 watt, never had a problem.
     
  12. MrChips

    Moderator

    Oct 2, 2009
    12,415
    3,354
    Digi-Key has set of 5 each of 73 values, 5%, 1/4W carbon film,
    part number RS125-ND, $14.95.

    Though the E12 set from Velleman in post#3 appears to be a lot cheaper.

    After that I would buy individual values in bulk - a lot cheaper.
     
    Last edited: Jul 12, 2011
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