This is how I pull a fire alarm the legal way. I have a Simplex 4251-20 T-bar pull station hooked up to an Edwards 6-18VAC transformer, using the 12VAC tap, which is hooked to a IBM (yes the computer company) 4030-2 horn. NOTE: the pull and horn are out of my personal collection, and are not hooked to the FD, or attached to a public system. Do not attempt to try this on a public system. Also I am not a professional electrician, do not attempt this unless you know what your doing. With that said, enjoy
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