A hobby power over ethernet solution (homebrew PoE)

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How to power the tuxgraphics ethernet board with a "Homebrew PoE" solution? We will use the spare wires in the ethernet cable to supply the power. That is: pair 1 (pins 4,5) will be the positive wires and pair 4 (pins 7,8) will be the negative wires. The data wires (pairs 2 and 3) are not touched.

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