USB powered water fog generating humidifier. With schematic.

There's quite a wide range of these ultrasonic water fog generating devices available on eBay. Unlike the traditional ones that have a large piezo disk submerged under water, these ones have a ring of piezo material that agitates a stainless steel disk with a wick pressed gently against it. This results in a very efficient water atomiser that requires very little power to operate.

Here's an eBay search link for this style of unit:-
http://www.ebay.com/sch/i.html?_from=R40&_sacat=0&_sop=15&_nkw=cartoon+usb+humidifier&rt=nc&LH_BIN=1


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