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Originally Posted by Tatsu
I dont think you need to "change" it to v3.3.. thats what U1 on the board is for i think, cant find the datasheet for it its a MCP something something (microchip power IC probably) anyway.. if you want to "change" the 5v output to 3.3, or 12 to 3.3 just use a voltage divider.
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In general, it's not a good idea to use a voltage divider in a power supply for a device. If you use large resistors, then any current you draw into the device will cause a larger voltage drop across the upper resistor and lower your supply voltage. If you use relatively small resistors, then you can reduce that drop, but you then have a low total resistance across your battery. This will drain your battery and make your resistors very hot. You should use a voltage regulator designed specifically for power supply applications. For relatively low currents < 500mA, you can just use a monolithic voltage regulator like an LM7805 (for a 5V regulator). LM7812 is the 12V version. You get the idea.
A search on Digi-Key should yield plenty of results.
Cheers!
-Joe