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Note that my circuit assumes that you always have power. If you were in "circuit #2" mode and power to the coil was lost, the system switches back to "circuit #1". If you're looking for something that switches permanently even after power loss...I'm sure there's something out there that does that, but I can't think of one off the top of my head. I can imagine how to construct one out of a flap of steel and a couple electromagnets though...
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