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Curiousphy
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I found this circuit (attached images) in an insulated pouch inside my basement's smoke detector compartment. It gets power from the hot line that feeds my smoke detector, and outputs power to a mystery load through a second outgoing romex wire (no idea where it goes). All my smoke detectors work without this outgoing feed, so I removed it and left the second romex unconnected at the moment. Is this an AC/DC converter circuit or some kind of filter? The blue part has a eec1.OK Mer-S250V part number. What could this mystery device be doing? I was thinking security alarm related, the house has ADT hookup. thanks!