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Thread: Resistor for red in TCSS crystal

  1. #1

    Default Resistor for red in TCSS crystal

    Hi - looking for guidance in the optimal size and spec resistor for the red in the TCSS crystals. I calculated the proper resistance and it suggests 1.8ohm/1.8W, and TCSS says the closest they sell is 2ohm/5w. I have over resistored the red because the specified closest is the fat white block that doesn稚 fit in any of my builds. I have done this 10+ times and they work and last, just finally got annoyed with how dim the red crystal is in the Kylo I just built.


  2. #2
    Sith Warrior darth_chasm's Avatar
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    May 2015
    United States
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    3.7v battery I’m assuming? Given the results you posted you’re calculating your resistance at 1 amp! The crystals have 5mm leds in them. They are only supposed to be run at 20mA. You need something more like 80-100 ohm 1/8 watt.
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  3. #3


    Yep...brain cramp over here, thanks!


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