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This is so cool! I've been researching how to do this (except I was thinking of using the piezo buzzer not the LED).I even asked whether it was a good idea to do so on electronics.stackechange.com. Most people seem dead-set against it. (http://electronics.stackexchange.com/questions/254820/using-ups-buzzer-as-a-method-of-determining-ac-power)
I'm not terribly surprised that it remains cool. Please forgive my dry humour; when I said "Add a fan to cool it down" I was saying it in the same vein as saying that the propeller on an aircraft is there to keep the pilot cool... The purpose of the fan would merely be to add a slight spin to the floating object. (or you could forgo it and just give it a nudge when you place it there :-) )
So here's a thought: How about mounting a small cpu/gpu fun to cool down the item being levitated (off center)? It might not cool it off that much, but it might put slow rotation on the object. Maybe use a PWM circuit to slow down the fan if it's spinning too fast to reduce noise? Or just under-volt a fan? (I'm using a 12V case-fan running off of the USB (5V) on a Raspberry Pi to cool down the same Raspberry Pi from around 57°C to around 43°C. The bonus of using the 5V is that the fan spins much slower and produces next to no noise.
Very Cool! Would love to build something like this one day (and have a kitchen to match it). No jokes about the DVD collection (Office Space makes up for any negative comments that any may make).Something that I would have considered adding would have been a dimmable LED down-light under the overhanging shelf, but as you have so much light there anyway, it may have been overkill.
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