120MM 5V Volt Fanbus?

psylencer2003 · 21-January-06, 09:34 AM

Hey guys, here's a math question for yall. I have a slew of COMAIR ROTRON - MUFFIN DC 120MM fans laying around from some old network hubs that i dismantled. I'm using them for my ghetto water cooling project, but i need to make a rheobus for them. I want to run 2 rheostats with 2 fans on each bus. Fan specs are:
Model MC05J3
5 VDC
.75 A
3.75 W
I'm wondering what pot. will handle 2 of these badboys.
Thanks!

psylencer2003 · 21-January-06, 09:42 AM

Quote:

Originally Posted by psylencer2003


	Hey guys, here's a math question for yall. I have a slew of COMAIR ROTRON - MUFFIN DC 120MM fans laying around from some old network hubs that i dismantled. I'm using them for my ghetto water cooling project, but i need to make a rheobus for them. I want to run 2 rheostats with 2 fans on each bus. Fan specs are: Model MC05J3 5 VDC .75 A 3.75 W I'm wondering what pot. will handle 2 of these badboys. Thanks!

I guess I should have put this in the fan forum huh?

The Dragon Reborn · 21-January-06, 10:06 AM

The Sunbeam Rheobus should be able to handle those...

TDR

psylencer2003 · 21-January-06, 10:29 AM

Quote:

Originally Posted by The Dragon Reborn


	The Sunbeam Rheobus should be able to handle those... TDR

The sumbeam is set up for 12V, this is a 5v setup, plus im going for an oldskool DIY look. Plus, i could use the soldiering practice.

P.S. Im a HUGE Robert Jordan fan
Tai'Shar Manentheren!

The Dragon Reborn · 21-January-06, 10:44 AM

Well... this Rheobus allows total control between 0v~12v.. so I thought you could use them...

TDR

Nerdz · 21-January-06, 01:27 PM

You have all your info, 3.75W. So use a 5W Pot...(it gets expensive..) Or you can use a vairable voltage regulator to control it..

http://www.cpemma.co.uk/reg.html

post_break · 21-January-06, 01:55 PM

This one can handle 20watts per channel. Im not sure if this is what you are looking for but Im getting those same style fans and this is what I am using to control them.
http://www.xoxide.com/subl4poblred.html

psylencer2003 · 22-January-06, 01:46 PM

Well, I decided to try a few different potentiometers, only managed to set 2 on fire. 25 Ohms is way too much resistance, and the fan wont spin until the pot is turned like 90% up. Next smallest I could find was a 5k Ohm and then a 10k Ohm, both of those started smoking right away. The 10k ohm on actually puffed a bit of flame. I'm going to search around and see if i can find a 5W pot, but there isnt really anywhere to get elec parts in my town other then Radio Crack.

NeCrOmAnCeRoFsIn · 22-January-06, 02:12 PM

lots of places exist online, you need to think outside the box when going old school! They are around I will hunt you some links!

NeCrOmAnCeRoFsIn · 22-January-06, 02:15 PM

Do you want linear? or Rotary?

NeCrOmAnCeRoFsIn · 22-January-06, 02:20 PM

You are gonna have to build up a circuit, I have found 1.5's and 2.0's but nothing bigger!

psylencer2003 · 22-January-06, 03:17 PM

Thinking outside the box is fine, but I dont have a credit or debit card, no real way to order stuff online. So I have to use local vendors.

Nerdz · 22-January-06, 04:18 PM

YOu can use money order in some places. Try Mouser.com for parts or Jameco.com. You can get their catalog and send in a MO with it.

21-January-06, 09:34 AM		#1 (permalink)
psylencer2003 Apex Techie Wannabe	120MM 5V Volt Fanbus? Hey guys, here's a math question for yall. I have a slew of COMAIR ROTRON - MUFFIN DC 120MM fans laying around from some old network hubs that i dismantled. I'm using them for my ghetto water cooling project, but i need to make a rheobus for them. I want to run 2 rheostats with 2 fans on each bus. Fan specs are: Model MC05J3 5 VDC .75 A 3.75 W I'm wondering what pot. will handle 2 of these badboys. Thanks!

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21-January-06, 10:06 AM		#3 (permalink)
The Dragon Reborn Apex Elite Expert Tech	The Sunbeam Rheobus should be able to handle those... TDR

21-January-06, 10:44 AM		#5 (permalink)
The Dragon Reborn Apex Elite Expert Tech	Well... this Rheobus allows total control between 0v~12v.. so I thought you could use them... TDR

21-January-06, 01:27 PM		#6 (permalink)
Nerdz Sir Knight of Spamalot	You have all your info, 3.75W. So use a 5W Pot...(it gets expensive..) Or you can use a vairable voltage regulator to control it.. http://www.cpemma.co.uk/reg.html

21-January-06, 01:55 PM		#7 (permalink)
post_break I Drive A Mac	This one can handle 20watts per channel. Im not sure if this is what you are looking for but Im getting those same style fans and this is what I am using to control them. http://www.xoxide.com/subl4poblred.html

22-January-06, 01:46 PM		#8 (permalink)
psylencer2003 Apex Techie Wannabe	Well, I decided to try a few different potentiometers, only managed to set 2 on fire. 25 Ohms is way too much resistance, and the fan wont spin until the pot is turned like 90% up. Next smallest I could find was a 5k Ohm and then a 10k Ohm, both of those started smoking right away. The 10k ohm on actually puffed a bit of flame. I'm going to search around and see if i can find a 5W pot, but there isnt really anywhere to get elec parts in my town other then Radio Crack.

22-January-06, 02:12 PM		#9 (permalink)
NeCrOmAnCeRoFsIn Apex Master Tech Apprentice	lots of places exist online, you need to think outside the box when going old school! They are around I will hunt you some links!

22-January-06, 02:15 PM		#10 (permalink)
NeCrOmAnCeRoFsIn Apex Master Tech Apprentice	Do you want linear? or Rotary?

22-January-06, 02:20 PM		#11 (permalink)
NeCrOmAnCeRoFsIn Apex Master Tech Apprentice	You are gonna have to build up a circuit, I have found 1.5's and 2.0's but nothing bigger!

22-January-06, 03:17 PM		#12 (permalink)
psylencer2003 Apex Techie Wannabe	Thinking outside the box is fine, but I dont have a credit or debit card, no real way to order stuff online. So I have to use local vendors.

22-January-06, 04:18 PM		#13 (permalink)
Nerdz Sir Knight of Spamalot	YOu can use money order in some places. Try Mouser.com for parts or Jameco.com. You can get their catalog and send in a MO with it.