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Thread: Resistor Question

  1. #1

    Default Resistor Question

    Hey all. I need some help on my resistor knowledge.
    I am planning a Graflex 2.0 build and only need the resistors.
    I am using a 18650 3.7 Lithium Ion battery, a NBv3 and Tri-Cree B/B/W XP-E2. This will be on a Padawan Chassis from Goth.
    I was wondering what resistor would I need to run the B/B in parallel and White for FoC.
    I did some calculations with Ohm's Law, but I believe they are incorrect.

  2. #2


    nvrmind. i see you got it sorted in another thread..
    Last edited by atomsk; 03-07-2016 at 11:46 PM.

  3. #3


    I would use one resistor for each LED.
    Wattage isn't that important just don't too big.
    Here is the tutorial.

    for blue: (3.7-3.47)/1=0.23 Ohm (You can get a .5 ohm resistor or solder two 0.5 ohm resistors parallel to get 0.25 ohm. Remember to summate the watt of all resistors in a parallel connection, so two 0.5 ohm resistor with 1w would be in parallel 0.25 ohm with 2w)
    for white: (3.7-3.15)/1=0.55 Ohm (You can get a .5 ohm resistor because it's a only FoC(Flash on Clash) or two 1.2 ohm resistor in parallel)

    for blue: 0.23*1^2=0.23 Watt (just round up to .5 watt or bigger)
    for white: 0.55*1^1=0.55 Watt (just round up to 1 watt or bigger)

    Thats the math, but you should understand the basics of Ohm's Law.
    You just can take .5 ohm resistor for all LED's.

    I was told that the real enemy of an LED is temperature not voltage

  4. #4


    How do I wire nano biscottie sound board

  5. #5


    Quote Originally Posted by bobbyp46 View Post
    How do I wire nano biscottie sound board
    Read the manual (which can be found in the store).
    All n00bs READ these first (PLEASE)!!!:
    1. Forum Guidelines
    2. FJK’s “Down and Dirty” guide to Ohm’s Law

    "Yeah, yeah, I've heard it all before... you want blindingly bright, super loud, running 1138 blinkies off of the cheapest sound card you can find AND you want all of it to run on a battery the size of a dime, and run for a very, VERY long time. That one cracks me up every time..."
    My email:

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