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A while ago I saw a lighted bookcase at a furniture store whereby you could turn its lights on and off (actually dim them by a couple of levels), just by touching one of the hinges on one of the cupboard doors.

Does anyone know if there are pre-packaged components for such a thing, or what would be involved in setting up my own for a bookcase I want to build?

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They have them for sale on E-Bay for less than $20, they are designed to work with incandescent 3-way bulbs but I think they make them for LEDs now too. Try E-Bay

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Yes, there are prepackaged touch switch modules whose input wire can be attached to any convenient piece of metal.

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