Originally Posted by
Silver Serpent
Correct. Pick your sound board first. The board you choose will determine your battery solution. Some work best at 3.7v, others work best at 7.4v. The sound card manual will tell you which is best, or if in doubt, you can ask us. Once you have a battery solution, you can work out the resistor values.
Unfortunately, there are currently no RGB AV switches in the store that let you choose the color. The RGB AV switches available will just cycle through their colors on their own. If your Google-Fu is up to par, you may be able to find an individually controllable one somewhere online. Not sure, I haven't looked myself.
For a color changing saber, the Prizm is probably the best starting option. The CF with Color eXtender works better, but it's a good deal more expensive. More complicated to wire up as well.