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I'm getting started on my first lightsaber, and I ordered a cree star (royal blue) led to be used with a NB2 sound card. I haven't gotten the parts in yet so I can't do any data collection. Will a 4.7 ohm 0.5 watt resistor be enough for a simple system like this, or should I order a stronger resistor?
Assuming you're using a 3.7V battery, that would be a much stronger resistor than you need. I suggest you take a look at this thread.
Unless that's a typo and you meant .47ohm
It was a typo. The resistor I'm looking at is a 0.47 ohm. As for the link, how would I find the forward voltage of my led?
It's listed in the specifications of the LED in the store. (or you can look up the XP-E2 color datasheet) it's 3.41vf @ 1A
Thank you. It's really good to see that experienced builders are willing to help novices
Oh, don't go mistaking me for an experienced builder ;) I'm just some guy.