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LEAP#330 Any-to-any Polarity DC Power Adapter

I recently got a device that has a 2.1mm power connector but in centre-negative configuration. Unfortunately I don’t have any centre-negative power packs on hand. I could of course just rewire one, but decided it might be the time to make up a generic any-to-any connector. In addition to centre-positive and centre-negative output plugs, I included a 9V battery bypass and polarity rectifier, so that the input supports both centre-positive and centre-negative connections. And of course an LED power indicator. As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub hero_image