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How to power desktop fans from mains

post #1 of 9
Thread Starter 
Hey guys,

Looking to build a custom cooler for my laptop, so I can get overlock it some more and get that extra bit if oomph.

I've got everything planned except for 2 things

1) Which fan?
I am looking at a number of fans, the best would be quieter fans with a higher CFM. I was looking at nocuta fans, but I know that Scythe and Yate loons are also solid
I'm looking to get 2x120mm fans

2)How to actually power the fans?
These 2 fans will be built into the cooler, and I will need them to run off the mains
I think that I will need a 220v-12v adaptor, but I'm not sure which one I need, and how the connections will be made.

Thanks
Edited by RaYYaN - 2/25/11 at 12:09pm
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post #2 of 9
Look around the house for an old wall wart to modify into a PSU for your cooler. The output should be listed on it.


Edited by Tw34k - 2/23/11 at 5:04pm
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post #3 of 9
Get a 12V DC transformer, Hobby shops will got them (trains, scalextric) or you might have one lying around. use a terminal block to wire them up, and Ur done.

You can use multimeter to work out the + and - as they are usually not very distinguishable.
Edited by andrewmchugh - 2/23/11 at 4:44pm
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post #4 of 9
What is the current draw for the fans?
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post #5 of 9
Quote:
Originally Posted by andrewmchugh View Post
Get a 12V transformer, Hobby shops will got them (trains, scalextric) or you might have one lying around. use a terminal block to wire them up, and Ur done.
A bit overboard for such a simple project. Most people are not comfortable with and should not attempt to work with mains current electrical devices. A simple 12v @ 1A wall wart with the end cut off will be more than capable of supplying whatever power draw his fans require.
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post #6 of 9
Quote:
Originally Posted by RaYYaN View Post
1) Which fan?
I am looking at a number of fans, the best would be quieter fans with a higher CFM. I was looking at nocuta fans, but I know that Scythe and Yate loons are also solid
I'm looking to get 2x230mm fans

2)How to actually power the fans?
These 2 fans will be built into the cooler, and I will need them to run off the mains
I think that I will need a 220v-12v adaptor, but I'm not sure which one I need, and how the connections will be made.

Thanks
1) If you are strictly looking at 230mm fan, perhaps this Thermaltake fan might be of interest to you.
http://www.thermaltakeusa.com/Produc...1&ID=1955#Tab0

If you allow 200mm fans, these are also worthy of consideration.
a. Antec Big Boy (http://www.performance-pcs.com/catal...ec43207a815d25)
b. Cooler Master MegaFlow (http://www.coolermaster.com/category...tegory_id=3510)

2) I think you need an AC Adapter to 12V DC Transformer, like the one linked below:
http://www.heatsinkfactory.com/ac-ad...connector.html
This will provide a 12V 4-pin Molex for connection to PC fans. Since it supplies 2A, you can use a Y-spiltter to connect to your 2 fans. Fan like the Thermaltake 230mm fan uses 0.42A only.

Example of a Y-spitter:http://www.newegg.com/Product/Produc...-025-_-Product


I hope these help.
Edited by windfire - 2/23/11 at 5:27pm
post #7 of 9
Quote:
Originally Posted by Tw34k View Post
A bit overboard for such a simple project. Most people are not comfortable with and should not attempt to work with mains current electrical devices. A simple 12v @ 1A wall wart with the end cut off will be more than capable of supplying whatever power draw his fans require.
Thats what I said, i think you don't understand me.

You're "wall wart" == my "transformer";
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post #8 of 9
Thread Starter 
Thanks for the quick replies guys, sorry it took long to reply notificaations weren't working -__-

I can grab one of those adaptors pretty easily, just wondering what the actual procedure would be to connect the fans up?

Also, I messed up the first post, I am actaully looking for 2x120mm fans, and wondering what you would recommend

Thanks
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post #9 of 9
if you have an old psu

connect the green wire to ground with a paperclip, then plug the fans into the 4pin molex connectors

red +5v
yellow +12v
black = ground


edit: oops, thought it was for testing fans
7.2v rc battery chargers will work fine too


Edited by ffejrxx - 2/25/11 at 1:42pm
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