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Unexpected demonic possession can completely ruin Christmas, particularly if it occurs while you're unwrapping your presents. So what better way to avoid paranormal party-poopers than by building an electronic field sensor into a standard Christmas card to warn of the presence of disembodied entities in a subtle and festive manner. This project was inspired by a friend asking if I could make him a field based ghost detector. Since I usually send him a Christmas card with LEDs in it, I decided to combine the two and make a Christmas card with a built in ghost detector. It uses a three stage cascade of common NPN transistors (BC547) to detect the slightest ambient electrical field and make Santa's eyes light up. I did a search on Google for "ghost detector schematic" and immediately found a circuit that I remembered building when I was a kid. Just a simple ultra high gain transistor array. I hard-wired the circuit and put it into a suitably themed Xmas card. It's quite amusing, since the eyes glow rather randomly when you move near or handle the card.