I saw in another thread that you felt that a member sold you an incomplete active hub. You should know that the vast majority of active hub users use PC power supplies to power their shows and that the components to use a 12v power supply was an additional cost option on in the coops. If I recall correctly, the parts option wasn't even available in the 4/12 coop.
Look in the Wiki under Lynx - Smart Strings / PixelNet and scroll down to the PixelNet 16 Port Active Hub and you will find information on the active hub and the 12v Option. I've provided the link to a Mouser parts list (from the Wiki) to give you an ides of what you'll need to add the 12v option.
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LoginFor my shows, I use large 12v server power supplies which need the option, but for bench testing and equipment setup I picked up a few cheap PC supplies for use on a few strings at a time.