The battery clasp on one of my smoke alarms broke (as well as one on the battery) so thinking sideways I put a regulator from an old failed project into service, and hooked it into the 12 volt line I have in the house.
Some really bad soldering (a word the yanks just can't pronounce) and junk wire to connect.
oh, we can say it, we just don't want to. lol
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