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Last night for the fun of it I disassembled a couple of circuit boards like this one:   I am not sure of their function but they seem to be a small receiver that is controlling 2 SPDT Relays whose switch contacts exit on the pins. I have about a dozen of them and the small project box and salvage components looked like a good collection of parts. After they were disassembled I began to ID the parts and among the regular things I found a 3 lead TO92 component marked 7039A-1. A little rese ...