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They have proven to do an excellent job of shunting flyback voltage from solenoid-controlled devices; relays, pump solenoids, etc. They are placed parallel to the offending load. I know they also help absorb some of the spark for the switches for these devices, not unlike what they do in a breaker point ignition system. Based on that, my hunch is that were you to place a non-polar electrolytic in parallel to the fan, it should smooth things out and help to remove the buzzing noise from the power wiring.
It's not an optical illusion.
It just looks like one.....
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