Originally Posted by
Jay-gon Jinn
An MR board will sizzle and smoke if you give it anything over 6.0volts. Lu also so not use a resistor to drop voltage from 6.4 to 6 volts, you use a 5 volt regulator for that. Resistors do have an effect on voltage, but not to that degree, they are for controlling current flow. As far as the leds go, the 3.5 volt rating is the forward voltage rating, meaning in a nutshell that it will require at least that much to properly light up. I have run several single rebels on MR boards over the years, and never had any trouble with blowing them up or under powering them. The soundboards itself will limit he amount of current the leds receive already, and the voltage will be the same as the input on the board. Use the 3.7v 18650 and you should be just fine.
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