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  #1  
Old 10-25-2010, 10:30 AM
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Default Foggy Glass - 12 volt fan

I bought a 12volt computer fan. I want to install it to hopefully get rid of some of the condensation on the glass. I have a 7.5 volt telephone power supply. My plans are to hook the fan to the power supply. The only question is... fan is 12v and supply is 7.5v Are there going to be any problems???
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  #2  
Old 10-25-2010, 11:05 AM
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Im no electrical expert by any means, but I think the only problem you would have is not getting enough power to the fan for full speed operation.

I would give it a shot. Worst case, you burn out a 5$ fan or adapter.

I have a few tiny 40mm fans hooked up together using an 2in1 adapter, then hooked to a speed controler, then to a transformer. The fans are rated for 12V and 0.05A, and the transformer supplies them with 12V and 0.7A. I was thinking the amprage was going to be to high, but they dont seem to be running overly fast. And the speed controler can reduce their speed all the way to like 60 rpm im guessing. I would suggest getting a speed controler if you notice the fan running overly fast. I should add it to my build thread one of these days....
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  #3  
Old 10-25-2010, 11:56 PM
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nope. your fine... it just won't run full speed.

speed controller = dimmer/rheostat or switch
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kill the python, boa and anaconda ban

1.0.0 columbian red-tail boa - p.j.! 55 gal planted fish tank 0.0.3 hermit crabs

like dart frogs? sign up on dartfrogz.com and be sure to put leapinglizard in the referral box.

http://www.kill-rulechange.com/
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  #4  
Old 10-27-2010, 08:18 PM
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Sounds good... still working two days later.
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  #5  
Old 10-30-2010, 08:22 PM
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12 volt converter made a huge difference on air flow. Now, I just need to figure out the best way to mount the fan and the best position to mount it.
Thanks for the help
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  #6  
Old 10-31-2010, 09:52 AM
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Default fans

don't forget to let us know just how you ended up using the fans...I'd like to mount some small fans and haven't been able to figure it out so that it looks neat and tidy...maybe someone could draw a picture, or take some pictures for the safest and neatest method. My tanks are not drilled but are 20G converted so any mounted computer fan would be through large vent holes on the Lexan front panel... Any suggestions would be helpful!
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  #7  
Old 10-31-2010, 11:59 AM
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here's one tank i'm working on...

100_2812.jpg 100_2817.jpg 100_2990.jpg 100_3004.jpg 100_3017.jpg

there's a lot more on this site if you're willing to search and check out the stickies.
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kill the python, boa and anaconda ban

1.0.0 columbian red-tail boa - p.j.! 55 gal planted fish tank 0.0.3 hermit crabs

like dart frogs? sign up on dartfrogz.com and be sure to put leapinglizard in the referral box.

http://www.kill-rulechange.com/

Last edited by beckdg; 10-31-2010 at 12:04 PM..
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  #8  
Old 10-31-2010, 07:52 PM
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Default 12 V fan...

Not to go off on another topic...after all, you posted the pictures...please give some sort of information about the steps you are taking in the process...I can see your idea of covering the box with probably some sort of heavy duty plastic, then the Great Stuff...but am realllllllly curious about some of the other things that are part of your build. I have done lots of reading of the stickies, but not being a plumber or electrician...some of the steps take a little longer for me to comprehend.....now if you want me to teach you how to make a perfect roast beef dinner complete with mashed potatoes, and all the trimmings maybe you might need some help...chuckle...maybe not...
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  #9  
Old 10-31-2010, 11:47 PM
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tools:

scissors
packing tape
standard office stapler

for great stuff;

pipe cleaner
paper towel
cup
acetone
serrated steak knife

supplies:

sams club cheerios box (empty w/boxtops for education removed)
staples
1 can great stuff
tank (obviously)
wood from a tree in my back yard (aged, soaked and baked)
wax paper
computer fan
knitting canvas

eventually;

9-12 volt dc converter (old electronic charger i had laying around from a beard trimmer, cordless phone or something)
dimmer or in-line power switch to cut the fan off during misting so it doesn't soak the front glass somehow

i folded the cardboard over the fan to get the right size and depth (i wanted the channel as deep as the fan thickness to minimize any flow restrictions).

then i cut and taped that channel to the tank. stared at it for a while to decide how i wanted the air to go across the glass...

removed the cardboard, cut my angles and attached the baffle piece (the angled cardboard at the end) with staples and packing tape.

re-attached them.

cut and taped a corner on the bottom.

put the fan in place.

cut and taped on the top corners lining them up with the fan in place.

removed the structure as one piece to finish stapling and taping.

realized the fan wouldn't fit/slide in correctly if the structure gave a little... or the fan could fall in and get stuck... so i cut 2 strips and bent them over the fan to determine length... then stapled/taped them into place to hold the fan in a groove.

used a lot of packing tape in small strips to re-apply the structure into place.

folded some cardboard around the fan to ensure a little wiggle room in the fan slot and as a backing for wax paper.

wrapped and taped the wax paper around the fan/cardboard.

shoved it in the slot to keep great stuff out.

cut, bent and taped knitting canvas on as vent covers. in hind sight this is really one thing you want to use staples on before you attach the structure to the tank in it's final position. explanation to follow

sprayed a thin layer of great stuff in all the cracks and in thin strips across the broad surfaces.

immediately cleaned the great stuff nozzle, tube and trigger with pipe cleaners, paper towel and acetone.

let it dry.

did a little smoothing/carving with a steak knife including making 2 channels/wedges for the wood.

sprayed a little more great stuff to build up a couple areas, fill in some of my carving, create more surface area against the glass to form a better bond, cover the huge gaps left from where the vent covers lifted when the g/s stuck better to the tape than the tape did to the cardboard and for something to press the wood into that will hold on to it.

cleaned the nozzle, trigger and tube... and whatever... again...

pressed the wood into the grooves now filled with great stuff.

popped a couple bubbles before they were over grown, touching glass or otherwise going to make things difficult.



between all this i;

fiddled w/the hood
drilled 2 holes for misting heads into a glass hood on my terra
installed the bulbs
cut glass lids for this tank and my terra
knurled the edges on those lids
mixed up some soil for this tank... mostly with inert, natural byproducts
put together the f/b (i think i'm going to adjust that a bit)
blah, blah, blah............................. long post... getting longer.... tired.... halloween..... 2 kids....... lol

i'm going to....

install the fan
cover the whole area with wax paper.... maybe cling wrap
fill the void with great stuff
remove the great stuff "plug" and take off the plastic/wax paper
cover the g/s in the tank and the plug
re-set the plug... as a plug... so it can just be lifted... and the fan removed... for cleaning/replacement/maintenance/etc.
do other things to the tank besides air circulation... including acclimating plants from my aquariums.


hope that helps
__________________

kill the python, boa and anaconda ban

1.0.0 columbian red-tail boa - p.j.! 55 gal planted fish tank 0.0.3 hermit crabs

like dart frogs? sign up on dartfrogz.com and be sure to put leapinglizard in the referral box.

http://www.kill-rulechange.com/
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  #10  
Old 11-01-2010, 08:17 AM
Chasing Crickets
 
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Default 12 V fan...

OMG!!! THANK YOU....that was the absolute best post ever about construction....someone, somehow give BECKDG an A+...if the other construction posts were as clear in the written directions, it would be so helpful. You know, a video of the process would be amazing...it is so original, at least to me who is new to the hobby...to use the methods and materials you are using...I am actually going to print the list out for checking off on materials and will await that video...put it on You Tube along with Grimm's!! Thanks...
One question--what is knurling...I do know from years of experience about Hurling... Thats what your kids will be doing after all that Halloween candy...
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