Overclock.net › Forums › Cooling › Cooling Experiments › Can this be done? If so, help me do it!
New Posts  All Forums:Forum Nav:

Can this be done? If so, help me do it!

post #1 of 12
Thread Starter 
Ok, so before anyone tells me to go buy a fan controller, thats not really a cost effective or practical option. Its also the easy way out and thats just not my style

I've got 13 fan in my sigrig. 2 of them have variable speed built into their power cords. Another 2 are fairly quiet. The remaining 9 however are incredibly loud.

Now this isn't really an issue for me and this is why I got them in the first place and didn't bother looking for a quieter solution to begin with, but I'm starting to get complaints form certain members of the lady folk, if you know what I mean. Suppose it wouldn't hurt at other times as well... Like if I ever start sleeping...

Anyway, 6 of those ear assaulting fans run off a single molex (split 4 ways, with 2 of the ends each being split 2 ways) and are attached to an externally mounted radiator. I'd like to build (or buy, if such thing exists) a small device that can be plugged in between the 4-way split and the cable it is plugged into, which can lower the speeds on all the fans connected to that split. Id prefer a knob, but a 3-way switch would be ok too.

Is this possible? if so, tell me how to build it and what I need.

If not, I assume making a simple on/off switch would be easy enough? Not preferred, but honestly If im just watching a movie with some friends or something, I only need one radiator functioning
Arcane
(33 items)
 
Sanctum
(9 items)
 
Fukurou
(15 items)
 
CPUMotherboardGraphicsRAM
Ryzen 7 1700 MSI B350M Mortar Arctic RX Vega 64 G.Skill TridentZ  
Hard DriveHard DriveOSPower
Samsung EVO 960 Consatellation Windows 10 Pro Corsair HX 1050 
Case
Raijintek Aeneas White Window 
CPUMotherboardRAMHard Drive
Core i5-661 GA-H55-USB3 12GB DDR3 1333 WD Caviar Black AALS 640GB 
Hard DriveHard DriveOptical DriveCooling
WD Caviar Green EARS 2TB Vertex Turbo 60GB (SSD) Samsung Blu-ray, Samsung DVD Burner H50 (With push/pull nocturas) 
OSMonitorKeyboardPower
Windows 10 Professional 64 LG 47inch LED LCD Saitek Eclipse Lite-touch Wireless Seasonic X750 Gold 
CaseAudio
CM690 II Passive bookshelfspeakers + amp. 
  hide details  
Reply
Arcane
(33 items)
 
Sanctum
(9 items)
 
Fukurou
(15 items)
 
CPUMotherboardGraphicsRAM
Ryzen 7 1700 MSI B350M Mortar Arctic RX Vega 64 G.Skill TridentZ  
Hard DriveHard DriveOSPower
Samsung EVO 960 Consatellation Windows 10 Pro Corsair HX 1050 
Case
Raijintek Aeneas White Window 
CPUMotherboardRAMHard Drive
Core i5-661 GA-H55-USB3 12GB DDR3 1333 WD Caviar Black AALS 640GB 
Hard DriveHard DriveOptical DriveCooling
WD Caviar Green EARS 2TB Vertex Turbo 60GB (SSD) Samsung Blu-ray, Samsung DVD Burner H50 (With push/pull nocturas) 
OSMonitorKeyboardPower
Windows 10 Professional 64 LG 47inch LED LCD Saitek Eclipse Lite-touch Wireless Seasonic X750 Gold 
CaseAudio
CM690 II Passive bookshelfspeakers + amp. 
  hide details  
Reply
post #2 of 12
See if the solution described in this article meets your style:-

http://www.hardwaresecrets.com/artic...g-a-Dime/496/1
post #3 of 12
Thread Starter 
Quote:
Originally Posted by windfire View Post
See if the solution described in this article meets your style:-

http://www.hardwaresecrets.com/artic...g-a-Dime/496/1
Great litte guide and i suppose I could make a mechanical switch to have it bridge different connections based on the combos presented in that guide, but it would be extremely bulky and flimsy with the materials i have on hand.

I'll definitely save it for later though,

I made a little sketch of what I want to do but I'm running off a linux live CD ATM so its kind of crappy... aaanyway here it is:

http://postimage.org/image/1vv4nby2s/full/

I'd prefer the knob, and if not that, the Three-Way switch. the on-off switch is OK if the others are not possible.
Arcane
(33 items)
 
Sanctum
(9 items)
 
Fukurou
(15 items)
 
CPUMotherboardGraphicsRAM
Ryzen 7 1700 MSI B350M Mortar Arctic RX Vega 64 G.Skill TridentZ  
Hard DriveHard DriveOSPower
Samsung EVO 960 Consatellation Windows 10 Pro Corsair HX 1050 
Case
Raijintek Aeneas White Window 
CPUMotherboardRAMHard Drive
Core i5-661 GA-H55-USB3 12GB DDR3 1333 WD Caviar Black AALS 640GB 
Hard DriveHard DriveOptical DriveCooling
WD Caviar Green EARS 2TB Vertex Turbo 60GB (SSD) Samsung Blu-ray, Samsung DVD Burner H50 (With push/pull nocturas) 
OSMonitorKeyboardPower
Windows 10 Professional 64 LG 47inch LED LCD Saitek Eclipse Lite-touch Wireless Seasonic X750 Gold 
CaseAudio
CM690 II Passive bookshelfspeakers + amp. 
  hide details  
Reply
Arcane
(33 items)
 
Sanctum
(9 items)
 
Fukurou
(15 items)
 
CPUMotherboardGraphicsRAM
Ryzen 7 1700 MSI B350M Mortar Arctic RX Vega 64 G.Skill TridentZ  
Hard DriveHard DriveOSPower
Samsung EVO 960 Consatellation Windows 10 Pro Corsair HX 1050 
Case
Raijintek Aeneas White Window 
CPUMotherboardRAMHard Drive
Core i5-661 GA-H55-USB3 12GB DDR3 1333 WD Caviar Black AALS 640GB 
Hard DriveHard DriveOptical DriveCooling
WD Caviar Green EARS 2TB Vertex Turbo 60GB (SSD) Samsung Blu-ray, Samsung DVD Burner H50 (With push/pull nocturas) 
OSMonitorKeyboardPower
Windows 10 Professional 64 LG 47inch LED LCD Saitek Eclipse Lite-touch Wireless Seasonic X750 Gold 
CaseAudio
CM690 II Passive bookshelfspeakers + amp. 
  hide details  
Reply
post #4 of 12
Yes it can be done by using either a potentiometer/rheostat or a multi-position switch. If you can give some details on the fans I can tell you specifically what you need for given voltage. For details either the measured combined resistance or amp draw would be most helpful or if the manufacturer gives either the amp or watt rating of the fan that would work too.
I would go with a multi-position rotary switch with each leg going through a resistor with x value to get to the desired voltage for the fans.
I prefer this over the pot/rheo due to the possibility to have a custom setup and ability to have full voltage.
post #5 of 12
Thread Starter 
Quote:
Originally Posted by Re-Evolution View Post
Yes it can be done by using either a potentiometer/rheostat or a multi-position switch. If you can give some details on the fans I can tell you specifically what you need for given voltage. For details either the measured combined resistance or amp draw would be most helpful or if the manufacturer gives either the amp or watt rating of the fan that would work too.
I would go with a multi-position rotary switch with each leg going through a resistor with x value to get to the desired voltage for the fans.
I prefer this over the pot/rheo due to the possibility to have a custom setup and ability to have full voltage.
I'm not gonna lie, that was completely over my head xD

Whatever gets the job done without being too large or fragile im all for it and thanks a lot man.

The fans I'm using are all Panflo 120mm. I can get you the manufacturer specs on them but the problem is when I ordered these I ordered high speeds but they gave me one or 2 (dont remember) medium speeds by mistake. I didnt want to bother with returning it so I BELIEVE I put one of them on this rad, and used the other as a case fan, but im not certain.

Would having one or 2 of them be mediums instead of high throw off the device terribly much or would it be ok?

High speed: http://www.sidewindercomputers.com/pa12hisp.html

Medium speed: http://www.sidewindercomputers.com/pa12mesp.html
Arcane
(33 items)
 
Sanctum
(9 items)
 
Fukurou
(15 items)
 
CPUMotherboardGraphicsRAM
Ryzen 7 1700 MSI B350M Mortar Arctic RX Vega 64 G.Skill TridentZ  
Hard DriveHard DriveOSPower
Samsung EVO 960 Consatellation Windows 10 Pro Corsair HX 1050 
Case
Raijintek Aeneas White Window 
CPUMotherboardRAMHard Drive
Core i5-661 GA-H55-USB3 12GB DDR3 1333 WD Caviar Black AALS 640GB 
Hard DriveHard DriveOptical DriveCooling
WD Caviar Green EARS 2TB Vertex Turbo 60GB (SSD) Samsung Blu-ray, Samsung DVD Burner H50 (With push/pull nocturas) 
OSMonitorKeyboardPower
Windows 10 Professional 64 LG 47inch LED LCD Saitek Eclipse Lite-touch Wireless Seasonic X750 Gold 
CaseAudio
CM690 II Passive bookshelfspeakers + amp. 
  hide details  
Reply
Arcane
(33 items)
 
Sanctum
(9 items)
 
Fukurou
(15 items)
 
CPUMotherboardGraphicsRAM
Ryzen 7 1700 MSI B350M Mortar Arctic RX Vega 64 G.Skill TridentZ  
Hard DriveHard DriveOSPower
Samsung EVO 960 Consatellation Windows 10 Pro Corsair HX 1050 
Case
Raijintek Aeneas White Window 
CPUMotherboardRAMHard Drive
Core i5-661 GA-H55-USB3 12GB DDR3 1333 WD Caviar Black AALS 640GB 
Hard DriveHard DriveOptical DriveCooling
WD Caviar Green EARS 2TB Vertex Turbo 60GB (SSD) Samsung Blu-ray, Samsung DVD Burner H50 (With push/pull nocturas) 
OSMonitorKeyboardPower
Windows 10 Professional 64 LG 47inch LED LCD Saitek Eclipse Lite-touch Wireless Seasonic X750 Gold 
CaseAudio
CM690 II Passive bookshelfspeakers + amp. 
  hide details  
Reply
post #6 of 12
Quote:
Originally Posted by Zero4549 View Post
Would having one or 2 of them be mediums instead of high throw off the device terribly much or would it be ok?
The medium speed fans would just run a bit slower just like they do now so no the device would not be affected very much.

I figured the required values based on 6 high speed fans which have a total resistance of 4.35 ohms and total draw of 2.76 amps/33.12w.
By using the below linked 5 ohm 50w rheostat you will be able to vary the voltage to the fans from ~5-12v
http://cgi.ebay.com/OHMITE-5-OHM-50-...item5d2757bc22

Link to show how to wire the rheostat
http://www.bit-tech.net/modding/2001...peed_control/1
disregard their comment on using a rheo with a 20-50ohm value and 3w rating as they are only controlling 1 fan.

Just a little explanation of why you can disregard the comment.
Your fans are wired in what is called a parallel circuit. When components are wired in parallel voltage is constant, amperage is additive and resistance is reciprocal. By putting the Rheo in the 12v supply you are creating a series/parallel circuit. The series section of the circuit causes a voltage drop that is relational to the parallel circuit. ie if the resistance of the series circuit is equal to the parallel circuit you get a 50% reduction in voltage.
An example with simple numbers to show what would happen with a 20ohm rheo
Supply 12v
fans total resistance 5 ohms (close to what you have)
Rheo is 0-20 ohms
Rheo set @:
0Ω fans would have 12v
2.5Ω fans... 8v
5Ω fans... 6v (this is close to the stall/no start voltage for many fans)
10Ω fans... 4v (will stall)
20Ω fans... 2.4v (will stall)

Hope I didn't confuse you too much with all of the electricity/electronic jargon, I just prefer to explain myself.
Edited by Re-Evolution - 5/25/11 at 1:57am
post #7 of 12
Thread Starter 
Quote:
Originally Posted by Re-Evolution View Post
The medium speed fans would just run a bit slower just like they do now so no the device would not be affected very much.

I figured the required values based on 6 high speed fans which have a total resistance of 4.35 ohms and total draw of 2.76 amps/33.12w.
By using the below linked 5 ohm 50w rheostat you will be able to vary the voltage to the fans from ~5-12v
http://cgi.ebay.com/OHMITE-5-OHM-50-...item5d2757bc22

Link to show how to wire the rheostat
http://www.bit-tech.net/modding/2001...peed_control/1
disregard their comment on using a rheo with a 20-50ohm value and 3w rating as they are only controlling 1 fan.

Just a little explanation of why you can disregard the comment.
Your fans are wired in what is called a parallel circuit. When components are wired in parallel voltage is constant, amperage is additive and resistance is reciprocal. By putting the Rheo in the 12v supply you are creating a series/parallel circuit. The series section of the circuit causes a voltage drop that is relational to the parallel circuit. ie if the resistance of the series circuit is equal to the parallel circuit you get a 50% reduction in voltage.
An example with simple numbers to show what would happen with a 20ohm rheo
Supply 12v
fans total resistance 5 ohms (close to what you have)
Rheo is 0-20 ohms
Rheo set @:
0Ω fans would have 12v
2.5Ω fans... 8v
5Ω fans... 6v (this is close to the stall/no start voltage for many fans)
10Ω fans... 4v (will stall)
20Ω fans... 2.4v (will stall)

Hope I didn't confuse you too much with all of the electricity/electronic jargon, I just prefer to explain myself.
No actually that clarified things a bit for me. I love having information thrown at me even if its a bit beyond me at first

Thanks a ton man.

So.. at the lowest setting (aprox 5v), would it effectively shut off my fans? (based on this: 6v (this is close to the stall/no start voltage for many fans) 4v (will stall))? Cause That would be pretty cool (although not necessary I suppose).

At any rate I'm just about sure that thats what im going to do. Thanks again
Arcane
(33 items)
 
Sanctum
(9 items)
 
Fukurou
(15 items)
 
CPUMotherboardGraphicsRAM
Ryzen 7 1700 MSI B350M Mortar Arctic RX Vega 64 G.Skill TridentZ  
Hard DriveHard DriveOSPower
Samsung EVO 960 Consatellation Windows 10 Pro Corsair HX 1050 
Case
Raijintek Aeneas White Window 
CPUMotherboardRAMHard Drive
Core i5-661 GA-H55-USB3 12GB DDR3 1333 WD Caviar Black AALS 640GB 
Hard DriveHard DriveOptical DriveCooling
WD Caviar Green EARS 2TB Vertex Turbo 60GB (SSD) Samsung Blu-ray, Samsung DVD Burner H50 (With push/pull nocturas) 
OSMonitorKeyboardPower
Windows 10 Professional 64 LG 47inch LED LCD Saitek Eclipse Lite-touch Wireless Seasonic X750 Gold 
CaseAudio
CM690 II Passive bookshelfspeakers + amp. 
  hide details  
Reply
Arcane
(33 items)
 
Sanctum
(9 items)
 
Fukurou
(15 items)
 
CPUMotherboardGraphicsRAM
Ryzen 7 1700 MSI B350M Mortar Arctic RX Vega 64 G.Skill TridentZ  
Hard DriveHard DriveOSPower
Samsung EVO 960 Consatellation Windows 10 Pro Corsair HX 1050 
Case
Raijintek Aeneas White Window 
CPUMotherboardRAMHard Drive
Core i5-661 GA-H55-USB3 12GB DDR3 1333 WD Caviar Black AALS 640GB 
Hard DriveHard DriveOptical DriveCooling
WD Caviar Green EARS 2TB Vertex Turbo 60GB (SSD) Samsung Blu-ray, Samsung DVD Burner H50 (With push/pull nocturas) 
OSMonitorKeyboardPower
Windows 10 Professional 64 LG 47inch LED LCD Saitek Eclipse Lite-touch Wireless Seasonic X750 Gold 
CaseAudio
CM690 II Passive bookshelfspeakers + amp. 
  hide details  
Reply
post #8 of 12
Check this:

http://www.reuk.co.uk/Using-The-LM31...te-Voltage.htm

You can stack them in parallel for additional regulating power.


They are about 2$ each.


I use them in my 6 channel, 18W per channel fan controller and work wonders with a small heatsink slapped on and a 40mm fan to keep it cool.
   
AGP bencher
(14 items)
 
CPUMotherboardGraphicsRAM
Ryzen R7 1700 Gigabyte GA-AX370-Gaming 5 Sapphire HD 6950 2GiB 2x8GB KFA2 HOF DDR4-3600 
Hard DriveHard DriveHard DriveHard Drive
Crucial MX100 256GB Seagate 600 Series 240GB Seagate 7200.14 2TB Samsung F3 1TB 
CoolingCoolingCoolingCooling
EKWB Supreme HF XSPC Rasa GPU EK XT360 EK 4.0 
OSMonitorMonitorKeyboard
W10 Pro LG IPS235 LG E2250V KUL ES-87 
PowerCaseMouseAudio
SF Leadex II 650W Lian Li PC-A05NB Logitech G9 Xonar DX 
AudioAudio
SMSL SA-S3+Technics CB-250 Sennheiser HD555 
CPUMotherboardRAMHard Drive
AMD A10-5700 Gigabyte F2A75M-HD2 G.SKILL Ares 2133 CL9 Hitachi 5K750 
Hard DriveCoolingOSMonitor
Momentus .7 200GB Noctua NH-L9a Server 2012 R2 Standard AUO B156HW01 
PowerCaseOther
PicoPSU-80-WI-25V AIO Aluminium Handmade TP-Link Archer Something Something Wi-Fi AC 
CPUCPUCPUMotherboard
Core2Duo E6400 Core2Quad Q6600 Pentium Dual Core E5200 AsRock 4COREDUAL-SATA2 R2.0 
GraphicsRAMHard DriveOptical Drive
A dumpload of ancient AGP cards Kingston Value DDR2-667 CL4 2T @CL3 1T Seagate 160GB 7200.10 LG IDE DVD-ROM 
CoolingCoolingOSMonitor
Ghettomade CPU waterblock 49cc 2stroke engine copper radiator WinXP SP2 32bit ProView 17" 
PowerCase
Tacens Radix V 550W Ghetto aluminium bench 
  hide details  
Reply
   
AGP bencher
(14 items)
 
CPUMotherboardGraphicsRAM
Ryzen R7 1700 Gigabyte GA-AX370-Gaming 5 Sapphire HD 6950 2GiB 2x8GB KFA2 HOF DDR4-3600 
Hard DriveHard DriveHard DriveHard Drive
Crucial MX100 256GB Seagate 600 Series 240GB Seagate 7200.14 2TB Samsung F3 1TB 
CoolingCoolingCoolingCooling
EKWB Supreme HF XSPC Rasa GPU EK XT360 EK 4.0 
OSMonitorMonitorKeyboard
W10 Pro LG IPS235 LG E2250V KUL ES-87 
PowerCaseMouseAudio
SF Leadex II 650W Lian Li PC-A05NB Logitech G9 Xonar DX 
AudioAudio
SMSL SA-S3+Technics CB-250 Sennheiser HD555 
CPUMotherboardRAMHard Drive
AMD A10-5700 Gigabyte F2A75M-HD2 G.SKILL Ares 2133 CL9 Hitachi 5K750 
Hard DriveCoolingOSMonitor
Momentus .7 200GB Noctua NH-L9a Server 2012 R2 Standard AUO B156HW01 
PowerCaseOther
PicoPSU-80-WI-25V AIO Aluminium Handmade TP-Link Archer Something Something Wi-Fi AC 
CPUCPUCPUMotherboard
Core2Duo E6400 Core2Quad Q6600 Pentium Dual Core E5200 AsRock 4COREDUAL-SATA2 R2.0 
GraphicsRAMHard DriveOptical Drive
A dumpload of ancient AGP cards Kingston Value DDR2-667 CL4 2T @CL3 1T Seagate 160GB 7200.10 LG IDE DVD-ROM 
CoolingCoolingOSMonitor
Ghettomade CPU waterblock 49cc 2stroke engine copper radiator WinXP SP2 32bit ProView 17" 
PowerCase
Tacens Radix V 550W Ghetto aluminium bench 
  hide details  
Reply
post #9 of 12
Quote:
Originally Posted by Zero4549 View Post
So.. at the lowest setting (aprox 5v), would it effectively shut off my fans? (based on this: 6v (this is close to the stall/no start voltage for many fans) 4v (will stall))? Cause That would be pretty cool (although not necessary I suppose).

At any rate I'm just about sure that thats what im going to do. Thanks again
It may or may not there are too many factors that affect the stall/no start voltage. My guess would be yes since they are mounted to a radiator which adds mechanical resistance to the fan due to the air restriction which causes an increase in electrical power requirement to spin/start the fan.

Something you can do as a quick test. If you have 4 AA batteries laying around you can connect them in series and connect a single fan to them to test for 6v start and how loud they are.

Edited by Re-Evolution - 5/25/11 at 12:54pm
post #10 of 12
Thread Starter 
Quote:
Originally Posted by Artikbot View Post
Check this:

http://www.reuk.co.uk/Using-The-LM31...te-Voltage.htm

You can stack them in parallel for additional regulating power.


They are about 2$ each.


I use them in my 6 channel, 18W per channel fan controller and work wonders with a small heatsink slapped on and a 40mm fan to keep it cool.
I honestly have no idea how I would use those.

Quote:
Originally Posted by Re-Evolution View Post
It may or may not there are too many factors that affect the stall/no start voltage. My guess would be yes since they are mounted to a radiator which adds mechanical resistance to the fan due to the air restriction which causes an increase in electrical power requirement to spin/start the fan.
Ah well ok then. If it turns out it does not stop them, would there be a practical way to modify it slightly to do so without making it impossible to reach full speed still? I don't think it will really matter but I'm just curious in case these fans start ticking loudly when set to very low speeds.
Arcane
(33 items)
 
Sanctum
(9 items)
 
Fukurou
(15 items)
 
CPUMotherboardGraphicsRAM
Ryzen 7 1700 MSI B350M Mortar Arctic RX Vega 64 G.Skill TridentZ  
Hard DriveHard DriveOSPower
Samsung EVO 960 Consatellation Windows 10 Pro Corsair HX 1050 
Case
Raijintek Aeneas White Window 
CPUMotherboardRAMHard Drive
Core i5-661 GA-H55-USB3 12GB DDR3 1333 WD Caviar Black AALS 640GB 
Hard DriveHard DriveOptical DriveCooling
WD Caviar Green EARS 2TB Vertex Turbo 60GB (SSD) Samsung Blu-ray, Samsung DVD Burner H50 (With push/pull nocturas) 
OSMonitorKeyboardPower
Windows 10 Professional 64 LG 47inch LED LCD Saitek Eclipse Lite-touch Wireless Seasonic X750 Gold 
CaseAudio
CM690 II Passive bookshelfspeakers + amp. 
  hide details  
Reply
Arcane
(33 items)
 
Sanctum
(9 items)
 
Fukurou
(15 items)
 
CPUMotherboardGraphicsRAM
Ryzen 7 1700 MSI B350M Mortar Arctic RX Vega 64 G.Skill TridentZ  
Hard DriveHard DriveOSPower
Samsung EVO 960 Consatellation Windows 10 Pro Corsair HX 1050 
Case
Raijintek Aeneas White Window 
CPUMotherboardRAMHard Drive
Core i5-661 GA-H55-USB3 12GB DDR3 1333 WD Caviar Black AALS 640GB 
Hard DriveHard DriveOptical DriveCooling
WD Caviar Green EARS 2TB Vertex Turbo 60GB (SSD) Samsung Blu-ray, Samsung DVD Burner H50 (With push/pull nocturas) 
OSMonitorKeyboardPower
Windows 10 Professional 64 LG 47inch LED LCD Saitek Eclipse Lite-touch Wireless Seasonic X750 Gold 
CaseAudio
CM690 II Passive bookshelfspeakers + amp. 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Cooling Experiments
Overclock.net › Forums › Cooling › Cooling Experiments › Can this be done? If so, help me do it!