Center positive – if you check the schematic, it’s indicated on the left hand side. It’s also practically the only way anybody sane should be wiring barrel jacks for new products (and SFE are doing their part). If you come across a center negative one not designed for a pre-existing application that has a center-negative power supply, send the designer a scathing e-mail and consider alternatives ;) (That said, it couldn’t hurt to include polarity information on the silkscreen.)
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