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Reply to "Smoking caboose pcb"

I think that is one of my designs, been a long time though and I am not sure.  As I recall I used an op-amp not a processor to regulate the element. Anyways I don’t think you can run a fan motor, just an element.  I probably left the center pin unconnected as a spacer between the 2 smoke element leads to prevent potential. shorts. 

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