Fogger/Fountain - Electronic Circuits Projects Diagrams Free

HarveyH42 · 7th January 2007, 10:41 PM

Just built a quick project. Kind of weird, but was searching through some junk boxes, and the parts just sort of lined up. Found a large clear plastic dome (thought they were smaller, for something else I'm working on), decided it was much too big. Then I found an ultrasonic fogger unit salvaged from a humidifier. So I got a little side-tracked, and took it apart, just to see. Put longer wires on the transducer and sense wire, drill a large hole in the plastic dome, hot glued it all together. Used one of the dog's bowls for a base. It fogs up pretty good, but there is sort of a fountain jet above the transducer. Need to put something over it sometime so it doesn't splatter on the sides. Had a RGB LED circuit still on a breadboard, so shoved it underneath in the dog bowl. Have to double up on the LEDs, but looks good for just an hour worth of work.

Marks256 · 7th January 2007, 10:50 PM

Well done!

Sceadwian · 8th January 2007, 01:46 AM

Just use a little more water and the fountain will go away.

HarveyH42 · 8th January 2007, 05:13 AM

Will give it another gallon of water and see what happens after work. Was a little concerned about how well the hot glue would hold up. The bowl I'm using as a base holds about a gallon... Live dangerously... No leaks so far, but the transducer does warm the water, and vibrates violently.

Sceadwian · 9th January 2007, 12:38 AM

I wouldn't use hot glue for a water seal, not to reliable, should probably use silicone sealant.

Marks256 · 9th January 2007, 01:14 AM

Use some ThumGum. I love that stuff! It is water proof (as it is used to seal holes outside of homes for pluming). You should be able to get it for fairly cheap at a local hardware store.

HarveyH42 · 9th January 2007, 01:25 AM

Added water, but no decrease in the foutain effect. At about 7 inches the amount of fog was seriously reduced. Figure I'll find/build some sort of deflector for the foutain to contain it. Thought about a pewter figurine at first, but the ones I make are mostly lead (closer to solder in composition...). Lead desolves in warm water, and breathing lead infused fog can't be good...

Yeah, hot glue was handy. Didn't really plan this out, it just sort of happened quickly on a sunday afternoon. Mostly just wanted to see how the fogger looked. Will likely put this on the shelf fo a while, and get back to my other project.

Andy1845c · 9th January 2007, 01:27 AM

Looks cool. Now you'll be all ready for next halloween

things · 14th April 2007, 10:48 AM

for some reason when you tip those foggers on their side under water in a plasic bowl the spot of the bowl where the fogger jet hits gets very hot and sometimes melts. i consider it an underwater microwave is it? just on a smaller scale and slightly different frequency?

HarveyH42 · 14th April 2007, 12:40 PM

Actually its ultrasonic through a piezo transducer. I don't know if its the piezo that gets hot, or the water and friction. The heatsink on the driver mosfet got hot enough to melt the plastic box I put the power supply and driver boadr in to keep it dry. Haven't played with it since I noticed the damage, need to do some heat management badly.

Sceadwian · 15th April 2007, 02:09 AM

It's not vaporization, it's atomization. Big difference. It's basically a solid state nebulizer. The fact that the fet gets hot can be attributed to the high switching frequency (lots of linear loss) and the relativly high power.

things · 15th April 2007, 04:57 AM

what i mean is that when you put the fogger up so it makes fog instead if you lay the fogger on it's side in a plasic bowl the area of the bowl where the foggers jet hits gets hot verry quickly and melts sometimes

HarveyH42 · 15th April 2007, 12:36 PM

I never ran it long enough for the water to get more then warm. Yes, I know its not vaporizing the water, doesn't get that hot. I'm guessing, but I'm thinking that THINGS melting observation is friction. The piezo can send a jet of water about 8 inches, and the frequency is very high.

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7th January 2007, 10:50 PM	(permalink)
Marks256	Well done! __________________ There is no "I" in "team", unless Apple makes it... Then it would be iTeam.

8th January 2007, 01:46 AM	(permalink)
Sceadwian	Just use a little more water and the fountain will go away. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."

8th January 2007, 05:13 AM	(permalink)
HarveyH42	Will give it another gallon of water and see what happens after work. Was a little concerned about how well the hot glue would hold up. The bowl I'm using as a base holds about a gallon... Live dangerously... No leaks so far, but the transducer does warm the water, and vibrates violently.

9th January 2007, 12:38 AM	(permalink)
Sceadwian	I wouldn't use hot glue for a water seal, not to reliable, should probably use silicone sealant. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."

9th January 2007, 01:14 AM	(permalink)
Marks256	Use some ThumGum. I love that stuff! It is water proof (as it is used to seal holes outside of homes for pluming). You should be able to get it for fairly cheap at a local hardware store. __________________ There is no "I" in "team", unless Apple makes it... Then it would be iTeam.

9th January 2007, 01:25 AM	(permalink)
HarveyH42	Added water, but no decrease in the foutain effect. At about 7 inches the amount of fog was seriously reduced. Figure I'll find/build some sort of deflector for the foutain to contain it. Thought about a pewter figurine at first, but the ones I make are mostly lead (closer to solder in composition...). Lead desolves in warm water, and breathing lead infused fog can't be good... Yeah, hot glue was handy. Didn't really plan this out, it just sort of happened quickly on a sunday afternoon. Mostly just wanted to see how the fogger looked. Will likely put this on the shelf fo a while, and get back to my other project.

9th January 2007, 01:27 AM	(permalink)
Andy1845c	Looks cool. Now you'll be all ready for next halloween

14th April 2007, 10:48 AM	(permalink)
things	microwave fogger???? for some reason when you tip those foggers on their side under water in a plasic bowl the spot of the bowl where the fogger jet hits gets very hot and sometimes melts. i consider it an underwater microwave is it? just on a smaller scale and slightly different frequency?

14th April 2007, 12:40 PM	(permalink)
HarveyH42	Actually its ultrasonic through a piezo transducer. I don't know if its the piezo that gets hot, or the water and friction. The heatsink on the driver mosfet got hot enough to melt the plastic box I put the power supply and driver boadr in to keep it dry. Haven't played with it since I noticed the damage, need to do some heat management badly.

15th April 2007, 02:09 AM	(permalink)
Sceadwian	It's not vaporization, it's atomization. Big difference. It's basically a solid state nebulizer. The fact that the fet gets hot can be attributed to the high switching frequency (lots of linear loss) and the relativly high power. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."

15th April 2007, 04:57 AM	(permalink)
things	what i mean is that when you put the fogger up so it makes fog instead if you lay the fogger on it's side in a plasic bowl the area of the bowl where the foggers jet hits gets hot verry quickly and melts sometimes

15th April 2007, 12:36 PM	(permalink)
HarveyH42	I never ran it long enough for the water to get more then warm. Yes, I know its not vaporizing the water, doesn't get that hot. I'm guessing, but I'm thinking that THINGS melting observation is friction. The piezo can send a jet of water about 8 inches, and the frequency is very high.