auxpowerunit
New Member
- Total Posts : 22
- Reward points : 0
- Joined: 2009/10/06 22:12:36
- Status: offline
- Ribbons : 1
I bought a Zalman CPU Cooler for my P55 LE system. Unfortunately, my Zalman came only with a 3-wire fan and no rheostat controller. So, the darned thing ran at full speed (and was too loud) when I plugged it into the 4-wire JCPU header. After some careful examination of the Intel PWM Fan specifications, I devised this simple circuit which allows me to use the Smartfan features in the BIOS. It uses a commonly available (from Radio Shack) MOSFET and 1/4 watt carbon resistor. Assembly involved scavenging the plug and wiring from the stock Intel fan, then the components were soldered directly to the wires and insulated with heat-shrink tubing. The finished adapter works great ! I experimented with a few different Smartfan settings, so now I have a reasonable tradeoff between cooling versus fan noise. Try this yourself, and let me know what you think.
|
thegcpu
New Member
- Total Posts : 76
- Reward points : 0
- Joined: 2010/06/03 09:23:33
- Status: offline
- Ribbons : 0
Re:Smartfan control of a 3-wire CPU Fan => Definitive Answer !
2010/07/11 22:17:18
(permalink)
Now that's something I could use, I'll build one . Do you think it will take the current of two fans?
|
auxpowerunit
New Member
- Total Posts : 22
- Reward points : 0
- Joined: 2009/10/06 22:12:36
- Status: offline
- Ribbons : 1
Re:Smartfan control of a 3-wire CPU Fan => Definitive Answer !
2010/07/12 05:09:17
(permalink)
Yes, it should be able to drive two fans simultaneously because the IRF510 is rated at 5.6Amps but I haven't tried this. Try using two identical fans wired in parallel. The motherboard is designed to only sense the speed of one fan though. So, connect the sense/tachometer (yellow wire) only on one fan, and leave the tacho disconnected on the other fan. You'll be able to monitor the fan speed within the EVGA E-LEET Tuning utility, under the Monitoring tab.
post edited by auxpowerunit - 2010/07/12 16:47:55
|
d333s
New Member
- Total Posts : 31
- Reward points : 0
- Joined: 2004/08/11 13:48:28
- Status: offline
- Ribbons : 0
Re:Smartfan control of a 3-wire CPU Fan => Definitive Answer !
2010/12/29 14:15:14
(permalink)
auxpowerunit, Do you have a part number for the resistor? I tried making one and I'm having difficulty getting it to function. (Admittedly, my fabrication skills leave much to be desired.) When I hook everything up and apply +5 volts to the PWM pin, (or connect it to the CPU header), the fan barely twitches. I need to apply 12 volts to make it turn. While it could be my poor soldering job, but I also may just have the wrong resistor. Thanks,
Intel Core i7-12700KF Desktop Processor 12 (8P+4E) Cores up to 5.0 GHz Unlocked ASUS ROG Strix Z690-E Gaming WiFi 6E LGA 1700(Intel 12th Gen)ATX gaming motherboard CORSAIR Vengeance DDR5 32GB (2x16GB) DDR5 5600 (PC5-44800) C36 1.25V - Black EVGA GeForce RTX 3080 Ti XC3 ULTRA GAMING, 12G-P5-3955-KR, 12GB GDDR6X, iCX3 Cooling 2 x Samsung - 980 PRO 1TB PCIe Gen 4 x4 NVMe Gaming Internal Solid State Drive AX1200i Digital ATX Power Supply — 1200 Watt 80 PLUS® Platinum Certified Fully-Modular PSU 2 x PNY XLR8 CS3040 4TB M.2 NVMe Gen4 x4 Internal Solid State Drive (SSD) - M280CS3040-4TB-RB 2 x SAMSUNG 870 QVO SATA III 2.5" SSD 1TB (MZ-77Q1T0B) 1 x WD RE 4 TB Enterprise Hard Drive: 3.5 Inch, 7200 RPM, SATA III, 64 MB Cache - WD4000FYYZ
|
RBIEZE
CLASSIFIED Member
- Total Posts : 4180
- Reward points : 0
- Joined: 2007/02/21 00:13:33
- Location: Northern Illinois...lurking in the Corn
- Status: offline
- Ribbons : 12
Re:Smartfan control of a 3-wire CPU Fan => Definitive Answer !
2010/12/29 17:27:16
(permalink)
Blue ribbon requested for you , Auxpower !!!! Thanks for posting the schematic, Ill try making a fan controller from your schematic tomorrow.
They say opposites attract. I hope you meet someone who is good-looking, intelligent, and cultured. http://www.youtube.com/watch?v=W2WsPN-rr9o Evga X58 4Way sli,W'Cooled i7 950 @3.8, Mushkin redline mem @6-7-6-18 1600Mhz, 2-Evga GTX770 Sli, Evga Gtx460 Physx, Corsair Neutron 120GB SSD,Samsung 240SSD, W.D Black 640GB /Corsair TX950 Psu, Hanns-G 28" Lcd, Logitech G540 5.1 Surround My Affiliate Code: EECLVEDV7Z
|
DraginElite
CLASSIFIED Member
- Total Posts : 4394
- Reward points : 0
- Joined: 2008/05/01 18:47:28
- Location: My Own Little Corner
- Status: offline
- Ribbons : 17
Re:Smartfan control of a 3-wire CPU Fan => Definitive Answer !
2010/12/29 17:45:33
(permalink)
Blue Ribbon awarded for technical merit and helping the community resolve Fan speed issues .... Good Job
|
auxpowerunit
New Member
- Total Posts : 22
- Reward points : 0
- Joined: 2009/10/06 22:12:36
- Status: offline
- Ribbons : 1
Re:Smartfan control of a 3-wire CPU Fan => Definitive Answer !
2010/12/31 20:19:30
(permalink)
Hi dsieracki, I'm glad you are giving this project a try. I know it is a bit troublesome to debug, but it really will work well once it is done. The resistor is a generic 1/4 watt carbon type. The equivalent Radio Shack model is 271-1328. Your testing methodology is correct. The fan should spin up to full speed when you apply +5V to the PWM pin. Since it is not doing that, I suspect the MOSFET is not turning on fully. One possibility is your Drain and Source connections may be reversed. I apologize - forgot to label those on my schematic. The Drain is the top one (which connects to +12V). Please check this on your build and let me know if this solves the problem. dsieracki auxpowerunit, Do you have a part number for the resistor? I tried making one and I'm having difficulty getting it to function. (Admittedly, my fabrication skills leave much to be desired.) When I hook everything up and apply +5 volts to the PWM pin, (or connect it to the CPU header), the fan barely twitches. I need to apply 12 volts to make it turn. While it could be my poor soldering job, but I also may just have the wrong resistor. Thanks,
|
d333s
New Member
- Total Posts : 31
- Reward points : 0
- Joined: 2004/08/11 13:48:28
- Status: offline
- Ribbons : 0
Re:Smartfan control of a 3-wire CPU Fan => Definitive Answer !
2011/01/01 13:32:14
(permalink)
Auxpowerunit, Thanks for getting back to me. That's the resistor I'm using and I actually had hooked up the transistor correctly. Once I knew I had the correct parts, I built another one and it works, (at least turning on with +5 volt.) In the meantime, I'd purchased 2 Nexus PWM fans for my HSF and connected them via custom PWM splitter, (at least I can crimp effectively), so my immediate requirement has been satisfied. Still, I plan on testing the adapter and trying out in the near future. I'll post back when I have more results. Thanks for working this out and publishing it for the community.
Intel Core i7-12700KF Desktop Processor 12 (8P+4E) Cores up to 5.0 GHz Unlocked ASUS ROG Strix Z690-E Gaming WiFi 6E LGA 1700(Intel 12th Gen)ATX gaming motherboard CORSAIR Vengeance DDR5 32GB (2x16GB) DDR5 5600 (PC5-44800) C36 1.25V - Black EVGA GeForce RTX 3080 Ti XC3 ULTRA GAMING, 12G-P5-3955-KR, 12GB GDDR6X, iCX3 Cooling 2 x Samsung - 980 PRO 1TB PCIe Gen 4 x4 NVMe Gaming Internal Solid State Drive AX1200i Digital ATX Power Supply — 1200 Watt 80 PLUS® Platinum Certified Fully-Modular PSU 2 x PNY XLR8 CS3040 4TB M.2 NVMe Gen4 x4 Internal Solid State Drive (SSD) - M280CS3040-4TB-RB 2 x SAMSUNG 870 QVO SATA III 2.5" SSD 1TB (MZ-77Q1T0B) 1 x WD RE 4 TB Enterprise Hard Drive: 3.5 Inch, 7200 RPM, SATA III, 64 MB Cache - WD4000FYYZ
|
auxpowerunit
New Member
- Total Posts : 22
- Reward points : 0
- Joined: 2009/10/06 22:12:36
- Status: offline
- Ribbons : 1
Re:Smartfan control of a 3-wire CPU Fan => Definitive Answer !
2011/01/02 09:07:23
(permalink)
Hi dsieracki, You're welcome. I'm glad to hear the project is progressing along. Please keep me informed. BTW, once you get finished with the hardware, try adjusting the PWM fan setting in the BIOS. I adjusted mine to keep the system pretty quiet during light loads, and the fan only goes to full speed after the temperature exceeds 45°C.
|
thetacowarrior
FTW Member
- Total Posts : 1698
- Reward points : 0
- Joined: 2007/04/02 18:51:29
- Location: Sacramento, CA
- Status: offline
- Ribbons : 1
Re:Smartfan control of a 3-wire CPU Fan => Definitive Answer !
2011/01/07 08:11:41
(permalink)
Although I love to build things (especially electrical ones) I wish I could buy this off of you just so you could get something for solving my issues. Now I have a question, that I believe should work, but I figure I'll ask a pro before I just go do it and mess something up. Since you said the mosfet should handle 5.6A, should hooking the +12 output and gnd to a powered 4pin molex as I have done here allow for motherboard control of multiple daisy chained fans up to 5.6A (likely less, but still), as on a radiator? Either way, thank you very much, I can't wait to go to radio shack and try this one.
post edited by thetacowarrior - 2011/01/09 22:37:08
Motherboard: ASUS M5A99FX CPU: AMD FX8350 Cooler: Noctua NH-D14 Memory: 8Gb (2x4Gb) G.Skill Sniper 1866 GPUs: EVGA GTX 480+HiFlow SLI PSU: PC Power and Cooling Silencer 910 Case: Corsair AIR 540 HDD: SanDisk Ultra 240GB SSD + 600GB Velociraptor + Seagate 750GB hybrid Other: Logitech z5300e 5.1 surround | Thermaltake MekaG1 | Logitech G500 mouse | Dell 24" monitor @ 1920x1080
|
auxpowerunit
New Member
- Total Posts : 22
- Reward points : 0
- Joined: 2009/10/06 22:12:36
- Status: offline
- Ribbons : 1
Re:Smartfan control of a 3-wire CPU Fan => Definitive Answer !
2011/01/09 19:15:20
(permalink)
thetacowarrior Although I love to build things (especially electrical ones) I wish I could buy this off of you just so you could get something for solving my issues. That's very kind of you ! No need for compensation though, I enjoy sharing with the community. At one point, I considered to make and sell small printed circuit boards for this fan controller, but then figured the market is quite limited. thetacowarrior Since you said the mosfet should handle 5.6A, should hooking the +12 output and gnd to a powered 4pin molex as I have done here allow for motherboard control of multiple daisy chained fans up to 5.6A (likely less, but still), as on a radiator? Yes, I think this will work well, provided the fans are wired in parallel and all have the same impedance (i.e. they are identical fans, so no one would hog too much current). Please keep me informed of your results.
|
thetacowarrior
FTW Member
- Total Posts : 1698
- Reward points : 0
- Joined: 2007/04/02 18:51:29
- Location: Sacramento, CA
- Status: offline
- Ribbons : 1
Re:Smartfan control of a 3-wire CPU Fan => Definitive Answer !
2011/01/09 22:58:08
(permalink)
I have 2 yate loon D12SH-12's in a push-pull, that's why I asked. I am having the same issue dsrecki had, where the +5v gate only twitches the fan with a 3.7v output voltage, and a +12v gate gives it a 8.7v output. Switching source and drain gives a full +12v output, but no control using the gate. I don't have the same mosfet, I am using a NTE2382 ( http://www.nteinc.com/specs/2300to2399/pdf/nte2382.pdf) which the guy at Fry's looked up and said is equivalent. I tried 2 different mosfets with the same results. I am wondering now if maybe moving the mosfet to the ground side of the circuit could solve my issues, I think I will mess with it more tomorrow. PS I tried how you have it off the mobo header and my way and have the same results. Thanks for any insight you may have as well as thanks again for figuring this out in the first place.
Motherboard: ASUS M5A99FX CPU: AMD FX8350 Cooler: Noctua NH-D14 Memory: 8Gb (2x4Gb) G.Skill Sniper 1866 GPUs: EVGA GTX 480+HiFlow SLI PSU: PC Power and Cooling Silencer 910 Case: Corsair AIR 540 HDD: SanDisk Ultra 240GB SSD + 600GB Velociraptor + Seagate 750GB hybrid Other: Logitech z5300e 5.1 surround | Thermaltake MekaG1 | Logitech G500 mouse | Dell 24" monitor @ 1920x1080
|
d333s
New Member
- Total Posts : 31
- Reward points : 0
- Joined: 2004/08/11 13:48:28
- Status: offline
- Ribbons : 0
Re:Smartfan control of a 3-wire CPU Fan => Definitive Answer !
2011/01/10 17:54:12
(permalink)
thetacowarrior
I have 2 yate loon D12SH-12's in a push-pull, that's why I asked. I am having the same issue dsrecki had, where the +5v gate only twitches the fan with a 3.7v output voltage, and a +12v gate gives it a 8.7v output. Switching source and drain gives a full +12v output, but no control using the gate. I don't have the same mosfet, I am using a NTE2382 (http://www.nteinc.com/specs/2300to2399/pdf/nte2382.pdf) which the guy at Fry's looked up and said is equivalent. I tried 2 different mosfets with the same results. I am wondering now if maybe moving the mosfet to the ground side of the circuit could solve my issues, I think I will mess with it more tomorrow. PS I tried how you have it off the mobo header and my way and have the same results. Thanks for any insight you may have as well as thanks again for figuring this out in the first place.
I'm glad this is also happening to someone else. I built three of these and all had the same problem. I tried one, clipped together with test clips, in case my lousy soldering was at fault. Fortunately for me, I had already order two PWM fans for my TRUE, so I just needed to make a 4-pin Y splitter. While your waiting for an answer, you could check out: http://www.svc.com/pwmx.html
Intel Core i7-12700KF Desktop Processor 12 (8P+4E) Cores up to 5.0 GHz Unlocked ASUS ROG Strix Z690-E Gaming WiFi 6E LGA 1700(Intel 12th Gen)ATX gaming motherboard CORSAIR Vengeance DDR5 32GB (2x16GB) DDR5 5600 (PC5-44800) C36 1.25V - Black EVGA GeForce RTX 3080 Ti XC3 ULTRA GAMING, 12G-P5-3955-KR, 12GB GDDR6X, iCX3 Cooling 2 x Samsung - 980 PRO 1TB PCIe Gen 4 x4 NVMe Gaming Internal Solid State Drive AX1200i Digital ATX Power Supply — 1200 Watt 80 PLUS® Platinum Certified Fully-Modular PSU 2 x PNY XLR8 CS3040 4TB M.2 NVMe Gen4 x4 Internal Solid State Drive (SSD) - M280CS3040-4TB-RB 2 x SAMSUNG 870 QVO SATA III 2.5" SSD 1TB (MZ-77Q1T0B) 1 x WD RE 4 TB Enterprise Hard Drive: 3.5 Inch, 7200 RPM, SATA III, 64 MB Cache - WD4000FYYZ
|
RBIEZE
CLASSIFIED Member
- Total Posts : 4180
- Reward points : 0
- Joined: 2007/02/21 00:13:33
- Location: Northern Illinois...lurking in the Corn
- Status: offline
- Ribbons : 12
Re:Smartfan control of a 3-wire CPU Fan => Definitive Answer !
2011/01/10 20:55:41
(permalink)
I submitted the schematic to a friend in school whos in advanced electronics. He Immediately said there is an issue and will have a revised schematic for me Wednesday night when we have our next class together.. So fingers crossed this will be sorted out for multiple fan control. P.S, Auxpower, Im not trying to disrespect your design in any way, just trying to figure out why it wont work for us...so thank you for the original design
post edited by RBIEZE - 2011/01/10 20:57:46
They say opposites attract. I hope you meet someone who is good-looking, intelligent, and cultured. http://www.youtube.com/watch?v=W2WsPN-rr9o Evga X58 4Way sli,W'Cooled i7 950 @3.8, Mushkin redline mem @6-7-6-18 1600Mhz, 2-Evga GTX770 Sli, Evga Gtx460 Physx, Corsair Neutron 120GB SSD,Samsung 240SSD, W.D Black 640GB /Corsair TX950 Psu, Hanns-G 28" Lcd, Logitech G540 5.1 Surround My Affiliate Code: EECLVEDV7Z
|
thetacowarrior
FTW Member
- Total Posts : 1698
- Reward points : 0
- Joined: 2007/04/02 18:51:29
- Location: Sacramento, CA
- Status: offline
- Ribbons : 1
Re:Smartfan control of a 3-wire CPU Fan => Definitive Answer !
2011/01/10 23:23:08
(permalink)
I believe I have it! I moved the mosfet to the ground side of the circuit by moving the fan's +12v input to constant power, the ground side of the fan to the mosfet's drain, and the source leg to direct ground. I left everything the same. Now I get 8.6v with the control circuit open (failsafe) a full 12v with the control at 5v, and 2.5v with the control grounded (no spinning = off) Here is my revised diagram, I highlighted the changes I made. As Rbieze said, no disrespect auxpower, just trying to get it working, and thanks for your initial input and inspiration. I don't know that the rpm readout will function in this configuration, I am about to find out as soon as I finish this post.
Motherboard: ASUS M5A99FX CPU: AMD FX8350 Cooler: Noctua NH-D14 Memory: 8Gb (2x4Gb) G.Skill Sniper 1866 GPUs: EVGA GTX 480+HiFlow SLI PSU: PC Power and Cooling Silencer 910 Case: Corsair AIR 540 HDD: SanDisk Ultra 240GB SSD + 600GB Velociraptor + Seagate 750GB hybrid Other: Logitech z5300e 5.1 surround | Thermaltake MekaG1 | Logitech G500 mouse | Dell 24" monitor @ 1920x1080
|
thetacowarrior
FTW Member
- Total Posts : 1698
- Reward points : 0
- Joined: 2007/04/02 18:51:29
- Location: Sacramento, CA
- Status: offline
- Ribbons : 1
Re:Smartfan control of a 3-wire CPU Fan => Definitive Answer !
2011/01/11 00:37:22
(permalink)
I have an update, this way works like a charm, as I suspected, the fan rpm readout is inop at all but max output due to the tach losing its power and therefore ability to read RPM, but this way the thing works amazingly. I can actually set the fans to stop below a certain temperature, and the ECO will just passively cool the cpu while it idles in silence. I couldn't be more satisfied, unless rbieze comes up with a way to make the rpm readout work, I'm calling this a success.
Motherboard: ASUS M5A99FX CPU: AMD FX8350 Cooler: Noctua NH-D14 Memory: 8Gb (2x4Gb) G.Skill Sniper 1866 GPUs: EVGA GTX 480+HiFlow SLI PSU: PC Power and Cooling Silencer 910 Case: Corsair AIR 540 HDD: SanDisk Ultra 240GB SSD + 600GB Velociraptor + Seagate 750GB hybrid Other: Logitech z5300e 5.1 surround | Thermaltake MekaG1 | Logitech G500 mouse | Dell 24" monitor @ 1920x1080
|
auxpowerunit
New Member
- Total Posts : 22
- Reward points : 0
- Joined: 2009/10/06 22:12:36
- Status: offline
- Ribbons : 1
Re:Smartfan control of a 3-wire CPU Fan => Definitive Answer !
2011/01/11 17:51:59
(permalink)
Hi thetacowarrior, dsieracki, and rbieze; You guys are AWESOME ! I'm so happy you figured this out. It really reinforces that we have a great sharing community here. I apologize that you had to waste time with my design. Unfortunately, the only test equipment I have is a VOM, when I really needed an oscilloscope. I think your design works better because the substrate of the MOSFET will be referenced to the common ground. So, the gate voltage would be more consistent (and therefore doesn't appear floating). Now, given that, I speculate mine worked perhaps because my fan motor coils must have a lower resistance, providing a ground path. Once again, great work and kudos to all of you ! Take care, Victor
|
auxpowerunit
New Member
- Total Posts : 22
- Reward points : 0
- Joined: 2009/10/06 22:12:36
- Status: offline
- Ribbons : 1
Re:Smartfan control of a 3-wire CPU Fan => Definitive Answer !
2011/01/11 20:57:40
(permalink)
dsieracki, I was just reviewing the design and recalled something else: I made mine work with the P55 LE motherboard. So, it just occurred to me that one of the signals may be implemented differently on other motherboards. The tricky part was figuring out how to interface with the "Control" signal (JCPU pin 4, which is the PWM signal), because the electrical characteristics are not well-defined in the Intel PWM Fan Specs. (See section 2.4 of this document: http://www.formfactors.org/developer/specs/REV1_2_Public.pdf ) Originally, I didn't use a pull-down resistor on the Control line. But without it, the fan always ran at full speed. After some experimentation, I settled on the 3.3K pull-down resistor. In retrospect, if you are using a different motherboard, I should have advised you to try some different values for this pull-down resistor. Or, it may even need a pull-up resistor, tied to the +12v line. So, don't throw away the 3 circuits which you already fabricated. Just try some different resistors to see if that will make it work. See you later, Victor
|
thetacowarrior
FTW Member
- Total Posts : 1698
- Reward points : 0
- Joined: 2007/04/02 18:51:29
- Location: Sacramento, CA
- Status: offline
- Ribbons : 1
Re:Smartfan control of a 3-wire CPU Fan => Definitive Answer !
2011/01/12 08:19:37
(permalink)
auxpower, absolutely no reason to apologize, you gave us a working basis to go off of, without it I would have never even tried this, or thought of it for that matter. And it gave me a reason to build something, which I always appreciate. Now I have a question for you, if you don't mind. I linked to the spec sheet of the mosfet I am using earlier, how do I tell the maximum amp output of the thing? I want to know how many fans I can attach to it.
Motherboard: ASUS M5A99FX CPU: AMD FX8350 Cooler: Noctua NH-D14 Memory: 8Gb (2x4Gb) G.Skill Sniper 1866 GPUs: EVGA GTX 480+HiFlow SLI PSU: PC Power and Cooling Silencer 910 Case: Corsair AIR 540 HDD: SanDisk Ultra 240GB SSD + 600GB Velociraptor + Seagate 750GB hybrid Other: Logitech z5300e 5.1 surround | Thermaltake MekaG1 | Logitech G500 mouse | Dell 24" monitor @ 1920x1080
|
auxpowerunit
New Member
- Total Posts : 22
- Reward points : 0
- Joined: 2009/10/06 22:12:36
- Status: offline
- Ribbons : 1
Re:Smartfan control of a 3-wire CPU Fan => Definitive Answer !
2011/01/12 20:29:01
(permalink)
Hi thetacowarrior, You know, I made that circuit because some of the best cooling fans available at that time still had 3-wire connections. Now, only a year later, there are tons of 4-wire choices. Oh well ! Anyway, the specification you are seeking is the "Continuous Drain Current, Id" which was listed as 9.2A, and derates to 6.5A at high temperature. When you wire your fans in parallel, just add the current consumption for each, to calculate the total. Send pics when you get this setup going. See you, Victor
|
thetacowarrior
FTW Member
- Total Posts : 1698
- Reward points : 0
- Joined: 2007/04/02 18:51:29
- Location: Sacramento, CA
- Status: offline
- Ribbons : 1
Re:Smartfan control of a 3-wire CPU Fan => Definitive Answer !
2011/01/12 22:02:31
(permalink)
Of course, now one more question while I upload the pics, how can I tell the current draw of the mosfet's gate circuit? Looking at the spec sheet it looks like its over 1A, but I don't think that's possible or I should have fried the header by now. I want to make sure I have the right mosfet since I don't have the one you specified, as well as I am trying to use another mosfet in another project at work (adding LED running lights to an '09 BMW 750Li), and I want the gate current to be as low as possible, to avoid interfering with the lamp control module.
Motherboard: ASUS M5A99FX CPU: AMD FX8350 Cooler: Noctua NH-D14 Memory: 8Gb (2x4Gb) G.Skill Sniper 1866 GPUs: EVGA GTX 480+HiFlow SLI PSU: PC Power and Cooling Silencer 910 Case: Corsair AIR 540 HDD: SanDisk Ultra 240GB SSD + 600GB Velociraptor + Seagate 750GB hybrid Other: Logitech z5300e 5.1 surround | Thermaltake MekaG1 | Logitech G500 mouse | Dell 24" monitor @ 1920x1080
|
auxpowerunit
New Member
- Total Posts : 22
- Reward points : 0
- Joined: 2009/10/06 22:12:36
- Status: offline
- Ribbons : 1
Re:Smartfan control of a 3-wire CPU Fan => Definitive Answer !
2011/01/13 19:18:49
(permalink)
Remember, MOSFETs are voltage-sensitive devices, so they don't depend on any steady-state current flow through the gate. However, when a pulse is applied, current rushes in because the gate is capacitive. That 1.5A spec is only for the transient flow into the gate. Steady-state current is very low because the spec listed Rds = 1MOhm. Almost any MOSFET should be okay for your projects, as long as you don't exceed the Vdss and Id specs.
|
thetacowarrior
FTW Member
- Total Posts : 1698
- Reward points : 0
- Joined: 2007/04/02 18:51:29
- Location: Sacramento, CA
- Status: offline
- Ribbons : 1
Re:Smartfan control of a 3-wire CPU Fan => Definitive Answer !
2011/01/14 08:29:44
(permalink)
Ok, thanks, I will have to just find one with the current handling capability then, thanks.
Motherboard: ASUS M5A99FX CPU: AMD FX8350 Cooler: Noctua NH-D14 Memory: 8Gb (2x4Gb) G.Skill Sniper 1866 GPUs: EVGA GTX 480+HiFlow SLI PSU: PC Power and Cooling Silencer 910 Case: Corsair AIR 540 HDD: SanDisk Ultra 240GB SSD + 600GB Velociraptor + Seagate 750GB hybrid Other: Logitech z5300e 5.1 surround | Thermaltake MekaG1 | Logitech G500 mouse | Dell 24" monitor @ 1920x1080
|
thetacowarrior
FTW Member
- Total Posts : 1698
- Reward points : 0
- Joined: 2007/04/02 18:51:29
- Location: Sacramento, CA
- Status: offline
- Ribbons : 1
Re:Smartfan control of a 3-wire CPU Fan => Definitive Answer !
2011/01/23 03:07:39
(permalink)
So the top one is the one that draws power from the motherboard, and the bottom, although ugly, is my first version that draws power from a 4 pin molex connector. I also figured out if you buy a 3 pin fan extension you can use the female bit as a plug for the mosfet and the male bit to plug the fan into. Sorry it took so long to finally upload, I honestly forgot.
Motherboard: ASUS M5A99FX CPU: AMD FX8350 Cooler: Noctua NH-D14 Memory: 8Gb (2x4Gb) G.Skill Sniper 1866 GPUs: EVGA GTX 480+HiFlow SLI PSU: PC Power and Cooling Silencer 910 Case: Corsair AIR 540 HDD: SanDisk Ultra 240GB SSD + 600GB Velociraptor + Seagate 750GB hybrid Other: Logitech z5300e 5.1 surround | Thermaltake MekaG1 | Logitech G500 mouse | Dell 24" monitor @ 1920x1080
|