Ultrasonic Mist Generator

Discussion in 'The Projects Forum' started by mcwoods, Jul 30, 2009.

  1. mcwoods

    Thread Starter New Member

    Jul 30, 2009
    3
    0
    Hey everyone,
    I am new to the forum and to this branch of science, so bear with me, and all help and suggestions are welcome and appreciated.
    My goal is to design a circuit that controls an ultrasonic nebulizer, similar to the ones that are inside of ultrasonic humidifiers, to generate cool mist. The power source I will be using is 24vdc. Does anyone have any idea where I should start on this project?
    thanks,
    mcwoods
     
  2. Externet

    AAC Fanatic!

    Nov 29, 2005
    758
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    How do you want to control it? To turn on at a certain time of the day ? For a certain amount of time ? Or multiple times a day? Or driven by a thermostat? Or when the dog barks ? Or at sunset ?...
     
  3. mcwoods

    Thread Starter New Member

    Jul 30, 2009
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    haha no i would like it to be manually controlled by an on/off switch. it would be an added bonus if there was a variable control for intensity (volume?) that did not affect the operating frequency
     
  4. someonesdad

    Senior Member

    Jul 7, 2009
    1,585
    141
    Since nebulizers are pretty cheap (especially at a second-hand store), one approach would be to take one apart and see how they designed it. A lot can be learned this way, but of course you may not have access to any of the custom components.
     
  5. Externet

    AAC Fanatic!

    Nov 29, 2005
    758
    57
    Hi.

    A plain switch will turn it on and off at will. A variable control may not work well enough as the oscillator for the nebulizer piezoelement has to run at a specific ~1.8MHz frequency and changing the input voltage may, or may not affect its frequency/ performance.

    When you have it working IF you plan to safely experiment turning gasoline into fog, let me know. Did not work for me. :(
     
  6. mcwoods

    Thread Starter New Member

    Jul 30, 2009
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