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Thread: NBv3 Blade Mirror CC LED Resistor Check

  1. #1

    Default NBv3 Blade Mirror CC LED Resistor Check

    Just making sure I'm looking at this right...

    Accent LED for CC to be run in parallel with the main blade color:

    LED FV: 3.4v
    LED current: 20mA
    Battery voltage: 3.7v

    This gives me a 18ohm 1/8w resistor?

  2. #2

    Default

    Looks right to me.
    We all have to start somewhere. The journey is all the more impressive by our humble beginnings.

    http://led.linear1.org/1led.wiz for the lazy man's resistor calculator!
    http://forums.thecustomsabershop.com...e-to-Ohm-s-Law for getting resistor values the right way!

  3. #3

    Default

    Quote Originally Posted by Silver Serpent View Post
    Looks right to me.
    Thank you. I was asking because it is a tiny resistor, and physically seems odd to me coming off the main blade LED lines. But the math works out.

  4. #4

    Default

    Think of it like a highway exit ramp. Many cars (current) are coming along the highway. Most of them continue on past the ramp (towards the main LED), and you'd need a larger resistor to dissipate a certain fraction of them. But only a few exit via the ramp, so you only need a tiny resistor to dissipate the same fraction of those.

  5. #5

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