Cabinet cooling - diyAudio
Go Back   Home > Forums > General Interest > Everything Else

Everything Else Anything related to audio / video / electronics etc) BUT remember- we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software Tools......

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 23rd May 2007, 06:28 PM   #1
diyAudio Member
 
Join Date: Apr 2007
Default Cabinet cooling

Hello,

I bought 2 of these fans and a bare wire standard plug yesterday from Radio Shack.

http://www.radioshack.com/product/in...tId=2103787&cp

My plan was to wire them both to the plug and plug them in to the back of my receiver so that they would turn on every time I used my receiver. I was thinking of having one at the bottom of the cabinet to pull in cool air, and one at the top to blow out hot air.

I was planning on wiring them parallel, but the fans just have 2 black wires. There is no marking as to which is positive and which is negative. What am I supposed to do? Did I buy the right fans?

Thanks for the help.
  Reply With Quote
Old 23rd May 2007, 06:43 PM   #2
diyAudio Member
 
Pjotr's Avatar
 
Join Date: Nov 2002
Location: Netherlands
Hi,

Your link shows "120VAC 3" Fan”.

Up to my knowledge, the AC mains has no plus or minus These fans are intended for direct connection to the (American) mains.

Cheers
  Reply With Quote
Old 23rd May 2007, 07:07 PM   #3
diyAudio Member
 
Join Date: Apr 2007
Thanks for the info Pjotr.

Another question I have is, can I wire both fans to one plug or do I need to wire them each to their own plug? Anyone out there with U.S. knowledge?
  Reply With Quote
Old 24th May 2007, 03:41 AM   #4
gootee is offline gootee  United States
diyAudio Member
 
Join Date: Nov 2006
Location: Indiana
Blog Entries: 1
darien87,

If the sum of the fans' two power ratings, in VA (Volt-Amps) or Watts [or the sum of their current ratings (Amps)], is less than the power rating [or current rating] of the plug you're planning to use, and that of the AC mains circuit it will plug into, then you should be able to wire them in parallel. Since they are small fans, it should be no problem at all, even without looking at the ratings of anything.

If there's any way to tell the two fan wires apart, besides color, e.g. if they each go to a certain part of the fan, the same way on both fans, you might want to pair the wires to the plug, appropriately, in case it matters with the type of motors your fans have.

Try not to run the wires (nor place the fans) near any other circuitry or devices, inside your enclosure.

MAKE SURE that your wiring job is safe and very, very durable and secure. If you don't know the accepted methods, don't do it.

For what it's worth, most of the literature I've read about ventilation fans seems to imply that a fan blowing in from the outside is usually more effective than one sucking air out of the enclosure. I realize that you are planning to have one of each. But if you have enough square inches of other exit holes, you might want to at least consider having both of them blowing inward.

You might also want to consider using some sort of filters. The replacement window air conditioner filter material (a sort of "open cell" plastic foam, usually on the order of 1/4 inch or thinner) has been a favorite of many who replaced fan filters on older Tektronix oscilloscopes, et al. I didn't look at your fan link. So I don't know how applicable it might be.

Good luck!

- Tom Gootee

http://www.fullnet.com/~tomg/index.html

-
  Reply With Quote
Old 29th May 2007, 04:02 AM   #5
diyAudio Member
 
Join Date: Apr 2007
Well I hooked the fans up yesterday, each to it's own separate power cable. They work fine, except they are HELLA loud. I noticed that when I put my finger on them and slow them down a little, the noise goes down quite a bit.

I was wondering if it is possible to do something to make the fans spin slower? Would wiring a resistor in do the trick? If so, what type of resistor and how do I wire it to the fans?

Thanks,
Darien
  Reply With Quote
Old 30th May 2007, 01:20 AM   #6
diyAudio Member
 
I_Forgot's Avatar
 
Join Date: Jan 2005
Location: Phoenix, Az.
A resistor might work, but you'll have to experiment to find effective values. It would be better to look for a small 48V transformer.

Usually if you want quiet fans, you get 220V fans and run them on 117VAC. They turn slowly and quietly.

I_F
  Reply With Quote
Old 31st May 2007, 04:05 PM   #7
diyAudio Member
 
Join Date: May 2007
Default Heres what I use

I bought a super quiet fan from

http://www.hometheatercooling.com

It has a thermostat for on/off and I can barely hear it, A friend of mine has two that I couldn't hear at all.

They told me you want to have the fan exhausting the air from the top.

Michael
  Reply With Quote
Old 31st May 2007, 04:30 PM   #8
diyAudio Member
 
Join Date: Apr 2007
Thanks for the info Cali, but $50 for a fan?!?! Yikes. I'm going to try a couple of potentiometers from Radio Shack, (about $3), to slow the fans down a bit and see if that gets rid of the noise. If that doesn't help, maybe I'll look into those fans you recommended.
  Reply With Quote
Old 31st May 2007, 06:47 PM   #9
diyAudio Member
 
I_Forgot's Avatar
 
Join Date: Jan 2005
Location: Phoenix, Az.
Get a cheap lamp dimmer from walmart or a hardware store. You should be ble to get one for $3 or so. It will work.

I_F
  Reply With Quote
Old 31st May 2007, 09:55 PM   #10
diyAudio Member
 
Join Date: Apr 2007
Funny that you mention that. I was told by a manager at Radio Shack to do the exact same thing. The guy at Radio Shack said that using a potentiometer might just end up burning up the fan.

But I ended up buying a couple of fans off eBay.

http://cgi.ebay.com/ws/eBayISAPI.dll...3677&rd=1&rd=1

Hopefully, these will work. They're rated at 27.5db. My Radio Shack fans are rated at 36db. Hopefully 27.5db is quiet enough for me.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
2 air way fan cooling on amp? 2fast Chip Amps 6 5th June 2005 04:07 PM
fan cooling? Raj1 Pass Labs 22 8th January 2003 02:33 PM
Cooling an amp with poor cooling BAM Solid State 8 31st December 2001 04:40 AM


New To Site? Need Help?

All times are GMT. The time now is 08:28 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2