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the right resistors for the power supply?


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Wheelro,
Your LEDs are "cool blue" aren't they? ;D
You can't use them "inline" (in series) because your 6V power supply doesn't have enough voltage. Using Ante's 150 ohm resistor in series with each puts 16.7mA through each one. Simply divide the current rating of the power supply by 16.7mA to calculate how many LEDs/resistors that it can power. ::)

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