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  #1  
Old 08-19-2014, 08:40 PM
Socalgordon Socalgordon is offline
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Default Electrical guru's.. need advice on 40mm DC fans

Hey everyone! It has been a long long time since I been on here. Been super busy with the band and my new day job.

Question:

I have 8-12V (DC) @ .07A 40mm fans that I want to hook up to an inclosure that I want have some air flow (4 intake and 4 exhaust on opposite sides of the enclosure).

What DC adapter voltage and amperage would I need? Is it 12V (DC) @ .64A? (.07 times 8)? I want to soldier the fans together (4 in a row) ultimately resolving to 2 wires (red/black) and then combine the 2 4 row together and then splice that with a AC/DC transformer that I have laying around (I have a couple hundred in a box with different voltages and amperage.) -- what can I say, I hoard them for special projects like this.

I want to be able to hook these up in the inclosure ( no switch needed) and forget about them.

Thoughts? See the attached illustration

Thanks in advance.

fan diagram.jpg
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Old 08-20-2014, 07:16 AM
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SShadow1974 SShadow1974 is offline
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Well your diagram is a little wonky. There are four conductors on each side that aren't attached anywhere.
If I remember my electronics courses from 1997... If you hook all the negatives together and run the positives in series, you'd be taking 12V and divide it by the number of fans. If you bring all positives back to one conductor, you'll be hooking them in parallel and you'll be splitting the current by the number of fans.
What I would do is get an electrical bus bar like this:
http://www.ebay.ca/itm/Splits-1-Inpu...be493d8&_uhb=1
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Old 08-20-2014, 08:04 AM
crunkfrunk crunkfrunk is offline
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You are almost right about the current draw (0.07A x 8 = 0.56A). But SShaow1974 is right you have the negative wires on the left connected to nothing, the same goes for the positives on the right. I also like that little bus bar he posted a link to, although you could probably just twist them all together. What do you need that much airflow in that small of a box for? Or is that just the important bits for the electrical wiring?
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Old 08-20-2014, 01:03 PM
Socalgordon Socalgordon is offline
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Default Opps.

Opps. here you go. I thought I was forgetting something.

Here is the updated diagram.

Thanks for the replies, I will check out the link in a bit.

This is a metal network box with vent holes, but the added electronics in the box will generate some heat. I would like create some air flow in the box to make sure things do not over heat.

fan diagram.jpg

Last edited by Socalgordon; 08-20-2014 at 01:05 PM.
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Old 08-20-2014, 11:43 PM
crunkfrunk crunkfrunk is offline
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Would you care to elaborate on "network box", I have years of experience in IT. My Dell server probably has less airflow that that box would create lol.
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Old 08-21-2014, 12:05 AM
Socalgordon Socalgordon is offline
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Sure, I too am in IT. I have a room that requires a mid-atlantic SBX-7 wall mount 7U network box. I have a 48port switche, a mini PC tower and wifi adapter in the box. There are 2-1 inch tall by 8 inch long perforated slits on both sides for venting (that is it). I want more air flow in the box as the equipment will be on 24-7. Surprisingly things to fit in the box and it has to be locked (wifi antennas are outside of the box).
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