tiny 12v fan for my miniature models to exhaust humidifier vapor/misthi
- Thread starter Crafts4Me
- Start date
Hello,
You do not need a hurricane for a humidifier.
A gentle breeze might do.
You can slowdown the fan using a simple pwm circuit.
SgtWookie made one on allaboutcircuits:
forum.allaboutcircuits.com
Bertus
You do not need a hurricane for a humidifier.
A gentle breeze might do.
You can slowdown the fan using a simple pwm circuit.
SgtWookie made one on allaboutcircuits:
Project: Simple PWM circuit
There have been a large number of requests for an easy-to-build PWM control circuit. You can always use a 555 or 556 timer circuit, but here's something you might build out of components from your "junk box." Attached is a schematic that uses a CMOS 4093 Schmitt input NAND gate in conjunction...
Bertus
Martaine2005
- May 12, 2015
- 5,276
- Joined
- May 12, 2015
- Messages
- 5,276
A normal AC to DC adaptor with an actual transformer inside will get warm and is completely normal.
However, if it’s running at 85-100% of its output specifications, you will need an adapter with higher current output.
Add all the items current requirements together for a total
However, if it’s running at 85-100% of its output specifications, you will need an adapter with higher current output.
Add all the items current requirements together for a total
it shouldnt need more than2 but i will use 3 amp
on fast speed it doesnt exhaust at all
the fan on slow exhausts only when the "smoke" pipe is right in front of it
my exhaust is mounted on the "roof"
building is all f about 10-12 " tall
smoke pipe is at 4 inches from the floor and there is not exhast to the "roof"
what else can i try?
on fast speed it doesnt exhaust at all
the fan on slow exhausts only when the "smoke" pipe is right in front of it
my exhaust is mounted on the "roof"
building is all f about 10-12 " tall
smoke pipe is at 4 inches from the floor and there is not exhast to the "roof"
what else can i try?
Martaine2005
- May 12, 2015
- 5,276
- Joined
- May 12, 2015
- Messages
- 5,276
Chimneys can be quite complicated. In real life, they are not straight up. They are designed to draw upwards and out. We use ‘smoke sticks’ to test for a draw.
Perhaps your model chimney doesn’t draw and is recirculating inside.
As an experiment, I would try a push pull affect. A fan (slow) pushing the air into the bottom of the chimney and a fan (slow) pulling air from the top of the chimney. If this works, you may get away with a small fan at the top and put the ‘smoke’ directly into the bottom of the chimney.
Perhaps your model chimney doesn’t draw and is recirculating inside.
As an experiment, I would try a push pull affect. A fan (slow) pushing the air into the bottom of the chimney and a fan (slow) pulling air from the top of the chimney. If this works, you may get away with a small fan at the top and put the ‘smoke’ directly into the bottom of the chimney.
hi
this is a very small model
there is no chimney
it is like an old fashioned roo a rectangle 10 inches high x 10 inches deep by 8 inches wide
top of pot about 5 inches
smoke about 4-5 inches from the foor
it is proving to be too big of a "dream" for me to enact and create
i think i will move the fan lower down like to a window height and try that
issue is i am poking and cutting too many holes into my diorama
this is a very small model
there is no chimney
it is like an old fashioned roo a rectangle 10 inches high x 10 inches deep by 8 inches wide
top of pot about 5 inches
smoke about 4-5 inches from the foor
it is proving to be too big of a "dream" for me to enact and create
i think i will move the fan lower down like to a window height and try that
issue is i am poking and cutting too many holes into my diorama
Martaine2005
- May 12, 2015
- 5,276
- Joined
- May 12, 2015
- Messages
- 5,276
Ok, try mounting the fan lower and put some kind of conduit or tube attached to it and attached to the roof too.
You need to stop the smoke recirculating like a convector heater.
Think about how a kitchen extractor fan works.
You need to stop the smoke recirculating like a convector heater.
Think about how a kitchen extractor fan works.
- Joined
- Nov 17, 2011
- Messages
- 14,272
An alternative: Instead of trying to suck the smoke into the chimney, use the fan to create pressure within the house with the pressurized air then pushing the smoke out of the chimney. This of course requires that all other potential openings or seams are rather airtight.
Similar threads
