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Computer fan wiring/power supply
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unissuh
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Joined: 29 Mar 2005
Location: Melbourne, Australia

PostPosted: 2006.07.09(Sun)9:21    Post subject: Computer fan wiring/power supply Reply with quote

So I'm looking to hook up 4 small computer fans into the hood of my tank for cooling purposes and basically I have jackall electrical knowledge.

I'm planning to wire them in parallel, with switches so that I can turn the fans on and off independently as required.

Aside from having a too low amperage AC/DC transformer, are there any problems with the aforementioned? Specifically, are there any problems with wiring fans in parallel (for some reason people tend to put them in series that I've seen) and/or running anywhere from 1-4 fans on a transformer that will handle at least 4 fans?
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Quaid
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Joined: 20 Jan 2005

PostPosted: 2006.07.09(Sun)21:26    Post subject: Reply with quote

Wiring in parallel will give you equal voltage with dispersed amperage. Wiring in series will give you dispersed voltage with equal amperage.

V=I*R

Resistance for Series is:
R(t)=R(1)+R(2)+R(3)+ ...

Resistance for Parallel is:
[1/R(t)] = [1/R(1)] + [1/R(2)] + [1/R(3)] + ...


If the above mathematics are beyond you grasp, please do not work with 120volt electronics. Stick to the 12volt and under. Also please buy an introductory electronics handbook or something of the like. Safety is important!


I don't understand the question about the transformer.

http://www.diylive.net/index.php/2006/02/04/electronics-tutorial/
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unissuh
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Joined: 29 Mar 2005
Location: Melbourne, Australia

PostPosted: 2006.07.10(Mon)1:48    Post subject: Reply with quote

Yeah, I am working at 12 volts and under...I have also read a basic electronics manual.

I think you guys call it a universal transformer...like this.

I'm just basically wondering if anyone sees anything wrong with running anywhere from 1-4 12V fans in parallel, each drawing 180mA, on a regulated 1A DC transformer. I don't think there should be anything wrong, but it doesn't hurt to double check.
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Quaid
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Joined: 20 Jan 2005

PostPosted: 2006.07.10(Mon)7:10    Post subject: Reply with quote

Should be fine.
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unissuh
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Joined: 29 Mar 2005
Location: Melbourne, Australia

PostPosted: 2006.07.10(Mon)7:20    Post subject: Reply with quote

Great, I guess it's time to look for the fans and transformer then. Thanks for the confirmation.
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