Since you can easily destroy hardware using this adapter, we really recommend it only for experts and people who fully understand what they’re getting into by pushing arbitrary voltages into their fancy computers! Use a multimeter to probe the magjack pins to verify you’ve got the right voltages before plugging in into your computer.
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Great idea. The plastic looks molded on. May a good candidate for a small fuse and blocking diode to help prevent mishaps. Good job!