These seem to be pretty common on eBay, so I got one to take to bits.
The circuitry is quite evolved, with a microcontroller controlling both the ultrasonic atomiser disk and also a boost circuit for stepping the voltage up.
There are locations on the PCB for extra filtering, that have been bridged by zero ohm links. I'd guess the designer wanted to keep their options open. That's also reflected in the extra LED position, allowing the PCB to illuminate a water container directly. I'd guess this PCB may find its way into other products too.
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12 thoughts on “Inside a flame effect humidifier with schematic”
  1. Avataaar/Circle Created with python_avatars 777anarchist says:

    Now we need a incinerating extinguisher to put it out.

  2. Avataaar/Circle Created with python_avatars Kevin Berg says:

    The effect of this is pretty cool looking. I have absolutely zero need for a humidifier in the Pacific Northwest, but it looks cool lol

  3. Avataaar/Circle Created with python_avatars George Gonzalez says:

    The MOSFET drive line from the MCU? It should probably be capacitor coupled to the gate. Otherwise if the MCU crashes the gate could get stuck high and that would be bad.

  4. Avataaar/Circle Created with python_avatars Bill Kerr says:

    Any thought about what frequency that transducer is being pulsed with?

  5. Avataaar/Circle Created with python_avatars TeddyRuxpin says:

    Your audio quality sounds off. I think there's too much low and mid tones but not enough treble?. I don't know but it makes your words VERY hard to distinguish from each other.

  6. Avataaar/Circle Created with python_avatars A Generic Account says:

    Has your airbnb host noticed that their small appliances are getting picked off like cattle under a UFO? 😄

  7. Avataaar/Circle Created with python_avatars David Bone says:

    A very good Monday morning to you all from Wellington Somerset

  8. Avataaar/Circle Created with python_avatars TechTinkering says:

    If you get used to things looking like they're burning when they aren't, when they are, you ignore them and things go downhill from there..😄

  9. Avataaar/Circle Created with python_avatars Pirelli says:

    I thought at first oh nooo… CLIVE'S toaster is on fire.😂😂
    Very interesting device, I've never seen it before.🥰

  10. Avataaar/Circle Created with python_avatars Level Three says:

    I'm holding out for the desktop fire breathing dehumidifier.

  11. Avataaar/Circle Created with python_avatars Sean Not-telling says:

    Now for the Big Clive mod of the day.
    Add a set of 18650 cells and charge controller to make it battery powered.

  12. Avataaar/Circle Created with python_avatars Joe Schmo says:

    "You've seen it working, now let's take it apart!"

    So now it's no longer working. 🤡🤡🤡

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