How can x voltage equal y voltage? It's not magic, it a little thing called a transformer, invented by Michael Faraday in 1831, or if they got really fancy they might use a voltage regulator.
Okay, good. How do you transform DC again? Transformers only work with AC, since they rely on the changing magnetic field created by a changing electric current.
Voltage regulators tend to only be able to regulate down.
What you need to use is a DC-DC converter, and as soon as you start doing this, it effectively creates a transformer-like situation. But you'll get some power loss.
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How can x voltage equal y voltage? It's not magic, it a little thing called a transformer, invented by Michael Faraday in 1831, or if they got really fancy they might use a voltage regulator.
Okay, good. How do you transform DC again? Transformers only work with AC, since they rely on the changing magnetic field created by a changing electric current.
Voltage regulators tend to only be able to regulate down.
What you need to use is a DC-DC converter, and as soon as you start doing this, it effectively creates a transformer-like situation. But you'll get some power loss.
It uses a boost converter to up the ~3V from the batteries to 5V.
http://en.wikipedia.org/wiki/Boost_converter
Or you go always go the DIY route with a Minty Boost. I made one last weekend that works well.
http://www.instructables.com/id/EGBQJPLCB2EP287KTZ?ALLSTEPS