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Chris,
Not all do....I have an industrial type panel one, I say that because I have only seen them used in the large control panels used in a factory or the like. Anyways, mine actually runs off mains power, which is the usual 110V here in the USA, but you may be able to get something similar.....I am not sure where though, I got mine at RadioShack, but I guess you could try any computer/ electrical wholesale place.
Hope this helps....
Ray
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