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100 ohm Resistor vs. 86 ohm resistor

Discussion in 'General Electronics Discussion' started by MMG, Oct 3, 2011.

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  1. MMG

    MMG

    2
    0
    Oct 3, 2011
    Okay, so I am really new to electronics. I am trying to make an array of led's. I used this website http://led.linear1.org/led.wiz and the inputs to the forms were, 5v Source voltage, 1.8v diode forward voltage, 20 mA diode forward current and 4 led's in the array. My question is can I use 100 ohm 1/4w resistors instead of 86 ohm 1/4w resistors? I checked radioshack and that is the closest i can get to 86 ohm resistors.
     
  2. davenn

    davenn Moderator

    13,654
    1,888
    Sep 5, 2009
    hi
    welcome to the forums :)

    yup that will be ok the LED may be just a little fainter, you may not even notice it. 86 Ohms isnt a standard value.

    failing that you could always series a 68 Ohm and a 15 Ohm and get 83 Ohms :)

    cheers
    Dave
     
  3. MMG

    MMG

    2
    0
    Oct 3, 2011
    Thank you very much for the help!
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,412
    2,780
    Jan 21, 2010
    or 82 ohms :)

    (which is a standard E12 value)
     
  5. KJ6EAD

    KJ6EAD

    1,114
    157
    Aug 13, 2011
    I reran your calculation. The optimal nonstandard value is 70Ω. The next higher standard value is given by the calculator.

    http://www.logwell.com/tech/components/resistor_values.html
     
    Last edited: Oct 4, 2011
  6. davenn

    davenn Moderator

    13,654
    1,888
    Sep 5, 2009
    DOH thats what ya get when I try to answer technical Q's too early in the morning before my first cup of coffee ;)

    Thanks Steve
     
  7. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    The exact resistor value here depends very much on the diode voltage drop. In my experience 2V is more usual for red LED's, in which case 50 ohms (or more) is ok.
     
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