Without compromising brightness... If so how?
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Yes, there are a lot of different power converters that can do this.
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My light cube runs under the control of a pic also. The primary trick to it is that only a few of the LED's are ever on at the same time; thus it stays below the chips voltage and current limits.
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its not possible
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The PIC controller is driving only one led at a time by multiplexing, so 6 volts is plenty.
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no its not