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Old 04-20-2003, 12:00 PM   #11 (permalink)
 
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You shouldn't hook them up to your ballast. The ballast makes a lot of changes to power the lights. You wouldn't want to connect the fans into it.

To power PC fans all you need is a small 12vdc power supply. Radio shack is the best place to look. It should only cost $8-14.

120VAC fans could be hooked into into your electrical power anywhwere. To egin with I just attached a two-wire appliace cord to it and plugged it into a power strip. Later I got a light dimmer for it. I can only drop the power about 40% of the fan does not start, but 30% will drop the noise by 50% and still provide hugh air movement.

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Old 04-21-2003, 03:17 AM   #12 (permalink)
 
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I think I've found a VERY quiet fan!

It's been decribed as whisper quiet.

The stats:
75 mA current draw
27 CFM of air flow
20 dB sound level.
runs on 12 volts.

Costs $8 each. That's a very good price.

So, what model is it?

Silencer 80mm Cooling Fan

Only took me a week to find!

<A HREF = "http://www.geocities.com/kfh227"> MY Web Page</A> - go there and see my future fish section to see what I have planned for my next 100+ gallon tank.
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Old 04-21-2003, 06:48 AM   #13 (permalink)
 
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I think my AC is around 140cfm, but 45-50db.

Most PC fans are around 38db (I think). THe quietest are ones with ball bearing shafts.

If I rebuild my hood I would get 6 of the 80mm model and put one at the base of each light. Maybe alternate a few in and the rest out.

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Old 04-24-2003, 09:40 AM   #14 (permalink)
 
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Okay, i just ordered three of these fans 92 mm Fans, the guy told me that I had to hook them up to a 12VDC battery if I wanted to use with AC power and not the computer. James, you said <BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR> To power PC fans all you need is a small 12vdc power supply. Radio shack is the best place to look. It should only cost $8-14.
<HR></BLOCKQUOTE> Now I looked at radio shack and this is what I found 12V AC to DC and 13.5/30v AC to DC are these what you meant. And if so, to power three of these fans, i would need one 12v adapter, and one 13.5/30v adapter? Or can I hook them all on one adapter? Is this correct. Thanks and are they pretty easy to wire up?
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Old 04-24-2003, 10:20 AM   #15 (permalink)
 
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When purchasing a power supply, you have two things to worry about.
1) voltage
2) current draw.

So, the transformer you get from Radio Shack has to be able to do the following.
1) Supply the proper voltage
2) Be capable of supplying enough current.

In your case, you need a power supply that meets the following requirments:
1) Supplies 12 volts DC.
2) Supplies a minimum of 255 mA (3*85 mA)

So, something like this:
12V/1000mA AC-to-DC Power Adapter
will fit the bill perfectly.

If you choose a different model, be sure that it is capable of supplying 12 volts and atleast 255 mA of current(1000 mA in the adapter I pointed out).

An idea is to get a variable voltage adapter. Something that rates 3-12 volts and atleast 255 mA. That way, you can run the fans slightly slower by selecting 10.5 volts (this would be quieter, but it also moves much less air this way).

And of course, when you get this working, please let us know if these fans are as they are rumored.

Karl


<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by mkam15:
Okay, i just ordered three of these fans http://www.pcpowercooling.com/produc...fan/index.htm, the guy told me that I had to hook them up to a 12VDC battery if I wanted to use with AC power and not the computer. James, you said <BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR> To power PC fans all you need is a small 12vdc power supply. Radio shack is the best place to look. It should only cost $8-14.
<HR></BLOCKQUOTE> Now I looked at radio shack and this is what I found http://www.radioshack.com/product.as...Fid=273%2D1779 and http://www.radioshack.com/product.as...Fid=273%2D1668 are these what you meant. And if so, to power three of these fans, i would need one 12v adapter, and one 13.5/30v adapter? Or can I hook them all on one adapter? Is this correct. Thanks and are they pretty easy to wire up?<HR></BLOCKQUOTE>

<A HREF = "http://www.geocities.com/kfh227"> MY Web Page</A> - go there and see my future fish section to see what I have planned for my next 100+ gallon tank.
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Old 04-24-2003, 10:31 AM   #16 (permalink)
 
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In regards on how to hook the fans up, use one adapter only! You can hook all three fans up to the one adapter. Since you seem new to this, the adapter I recomended in my previous post is more than adequate(sp?). I can save you a buck or two if you'd like by recomending a diffferent adapter. With the adapter I recomended, you could easily run 10 of the fans off of it (due to the current rating of 1000 mA), so adding in the future isn't much of an issue.

I'm not sure exactly how much you know about electronics, so let us know and we should be able to walk you through figuring out what wires go where. Some cutting of wires will be involved.

<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by mkam15:
Okay, i just ordered three of these fans http://www.pcpowercooling.com/produc...fan/index.htm, the guy told me that I had to hook them up to a 12VDC battery if I wanted to use with AC power and not the computer. James, you said <BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR> To power PC fans all you need is a small 12vdc power supply. Radio shack is the best place to look. It should only cost $8-14.
<HR></BLOCKQUOTE> Now I looked at radio shack and this is what I found http://www.radioshack.com/product.as...Fid=273%2D1779 and http://www.radioshack.com/product.as...Fid=273%2D1668 are these what you meant. And if so, to power three of these fans, i would need one 12v adapter, and one 13.5/30v adapter? Or can I hook them all on one adapter? Is this correct. Thanks and are they pretty easy to wire up?<HR></BLOCKQUOTE>

<A HREF = "http://www.geocities.com/kfh227"> MY Web Page</A> - go there and see my future fish section to see what I have planned for my next 100+ gallon tank.
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Old 04-24-2003, 10:40 AM   #17 (permalink)
 
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In regards to the 80 mm fan
I managed to track an owner down that is an audiophile. I forgot to post the correspondance earlier, so here it is:

I asked:
[/QUOTE] Hi,

I'm trying to track down a "quiet" cooling fan. my number one concern is dB levels.

You used the Silencer 80mm Cooling Fans and which is listed as a 20 dB fan.

That's pretty good.

If the fan is on by itself and your say 5 feet away, is it audible?

Do you know if there are any fans out there that are substantially quieter?

Thanks,
Karl
[/QUOTE]

And I got the following response:
<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>
I would say it's slightly audible at 5 feet. But that's counting the
cooling fan AND the power supply to run it. If it's in a cabinet and the
cabinet is closed, it's barely audible.

I don't know of quieter fans. I'm also using the ultra-quiet power supply
from the same company. I did get an email advertisement for this silent
power supply recently:

http://www.thinkgeek.com/computing/casemods/5e4c/

Don't know much about it, but it looks like a good alternative, or at least
something to look into.

Good luck,
<HR></BLOCKQUOTE>

To avoid confusion, the owner has a PC power supply and one of the 80 mm fans running next to each other. She uses the PC power supply to power the 80 mm fan, and some video game systems (nintendo, etc)

<A HREF = "http://www.geocities.com/kfh227"> MY Web Page</A> - go there and see my future fish section to see what I have planned for my next 100+ gallon tank.
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Old 04-24-2003, 01:29 PM   #18 (permalink)
 
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Thanks for the advise, so I need to get just one and use it on all three fans. Do I need to install anything else with the adapter? Like a adapter plug that I plug into the fan? I got the three pin connection on the fan.

i will definately give my results of the fans. I am installing them in a canopy that I am building for my 100 gallon tank.

Do you think two fans blowing in, and one fan blowing out would work? I am thinking about installing them in the back of the canopy and have two of them on each side blowing in and one in the middle blowing out. Just a thought. But thanks for the help. I will write if I need help.

Mike

[This message was edited by mkam15 on Thu April 24 2003 at 04:48 PM.]
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Old 04-24-2003, 01:45 PM   #19 (permalink)
 
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<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>An idea is to get a variable voltage adapter. Something that rates 3-12 volts and atleast 255 mA. That way, you can run the fans slightly slower by selecting 10.5 volts (this would be quieter, but it also moves much less air this way) <HR></BLOCKQUOTE>

Would this be what you are talking about 3/12v 800ma fan

Thanks.
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Old 04-24-2003, 03:23 PM   #20 (permalink)
 
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That's a better power supply than I even expected them to have

DC fans are aeasy to hook up. You can either buy adapter plugs (guess where ) or cut the adapters off and just wire them together. Its really easy. Red to red. Black to black.

I also found a second manufacturer for the fans... vantech

They have the stealth fans at 20db, but also have temperature sensitive fans that run a little noisier
Stealth Vantec 80x80x25mm Smart Fan, Retail Box

Vantec Thermoflow 80mm Temperature Controlled Fan, Retail Box

I have almost committed to building a new hood. If so I'll go with these.

James Hoftiezer

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