mist maker

[Pete Cross]

Our shops are currently full of halloween stuff, amongst which is a plastic
cauldron of cold water that has mist cascading out of it, they cost £35+
without the cauldron. Anyone got a schematic for one ? from what I can find
so far, they have a small ceramic disk which vibrates ultrasonically and
creates the mist. I am considering a piezo sounder fed with 40KHz @ 9volts
say, with the disk just below the water surface ? what do you reckon ?

 

[H. R. Bob Hofmann]

Our shops are currently full of halloween stuff, amongst which is a plastic
cauldron of cold water that has mist cascading out of it, they cost £35+
without the cauldron. Anyone got a schematic for one ? from what I can find
so far, they have a small ceramic disk which vibrates ultrasonically and
creates the mist. I am considering a piezo sounder fed with 40KHz @ 9volts
say, with the disk just below the water surface ? what do you reckon ?

Sounds to me like an ordinary Ultrasonic Humidifier here in the USA.
Cost $30 - $40 USD , then feed the output to your Halloween setup.

H. R. (Bob) Hofmann