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(Topic ID: 67695)

Vid's Guide to LED Stand Up Targets for 19 Cents

By vid1900

10 years ago


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  • Latest reply 8 years ago by dsuperbee
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    #40 10 years ago
     
    FRX

    Frax

    Pinside member

    US Conyers, GA

    12y 103K 16,662 2 9

    Quoted from wxforecaster:

    Looks like you are you basically running two sets LEDs, each in a 2 LED series, no? If so, with a 6.3V input, if you had LEDs with a 3-3.2V forward voltage (blue for example), you wouldn't need any resistor in this setup. If you dropped to 5V DC, depending on the color used, you may have to do all 4 in parallel as you wouldn't have enough supply to feed 2 of them in series.
    Definitely use the calculator link. Placing the resistor before or after the last LED really doesn't matter, but I like to put them before because in my brain the power gets dissipated before reaching the LED (not really true).

    God, I hear ya man. I'm getting into electronics stuff just now in regards to ohm's law and calculating resistance/voltage all that stuff in-circuit, and some of it just makes me want to tear my scalp off....since I don't have any hair to pull out.

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