fan controlers

satanicoo · 04-22-2003, 12:11 AM

i have a fan thats still a bit noisy with 7 volt.

with 5 it wont spin up.

is there a way to build a fan controler that instead ov voltage, it controls the rpm? would it be hard?

my idea is: build a circuit that sends impulses of 12 volts, so that it starts up, but never reaches high speeds, because they are only impulses.

Khledar · 04-22-2003, 03:09 AM

If you're going to build a circuit why not just build one that gives you about 6V ? Worried that's still too much?

BrianW · 04-22-2003, 10:25 AM

You will have to look, but there is already a circuit that does that. I believe some of the LCD's that have fan controllers have em. I'll look around when I get home from work.

You could always go with a Rheobus (I think they go as low as 5 volts, not sure though)

BrianW

redleader · 05-04-2003, 03:23 AM

SVC sells some nice ones. I bought the Zalman baybus, but I'd probably get the Vantec instead.

punish3r · 05-10-2003, 06:10 AM

Quote:

my idea is: build a circuit that sends impulses of 12 volts, so that it starts up, but never reaches high speeds, because they are only impulses.

You're talking about a PWM (Pulse Width Modulation) controller. Hell, I've built a PWM out of a LM339 and a few discrete components I had in my "Misc." box before. Wasn't able to provide much power, but it worked for what I needed it for. Now, if you're looking for something to sink a bit more power (like 3-12A@12VDC) for a larger fan, or group of fans, UTFSE and search for G. Forrest Cook. He did a decent 12/24VDC PWM for Home Power Magazine a couple of years ago, and I'm sure someone has the schematic online by now.

Update:
Found the article here enjoy

Cyco-Dude · 05-10-2003, 07:22 AM

its true that fans often wont start up on 5 volts, but once they are started they will run on 5 volts. start em on 12, then dail them down to 5.

also, procooling just posted a preview of a PWM fan controller that you can read here if you havent already.

Aardil · 05-10-2003, 08:21 AM

In referance to my PWM controller, that was the problem we found with the first proto type, it wouldnt start several models of fans. This was fixed in the final prototype and in in the production model. The problem was not all fans like PWM stutter voltage some took over 9 volts to get them going then you could throttle them back to around 5 volts. My circuit buffers the PWM spikes so that the signal is alot smoother and the fans will start at lower voltage without the normal PWM stutter.
Just food for thought
Aardil

Celestial_fury · 05-10-2003, 10:05 AM

I bought this:

I got it from www.coolputer.fi/
under the modding section there are 4 items called 'Speedlimit' for 2 or 4 fans. The Speedlimit 4 (LOPPU) is a kit with all components and a PCB for you to solder together (thats the one I bought). The non-LOPPU version is pre-built and costs twice as much.
They do world wide shipping.
What I like about it is that on Booting the pc, the fans run on full voltage for a couple of seconds, then throttle back to whatever setting you have on the Pots. You can also fine-tune the pots so that they wont dial down below a minimum voltage.
I currently run the following config:

POT 1: CPU Fan Coolermaster HHC-001 - 7000RPM Max (rpm monitoring still attatched to MOBO)
POT 2: 120mm fan on side panel
POT 3: 2X 80mm intake fans
POT 4: 2x 80mm outtake fans

FuRy

04-22-2003, 12:11 AM	#1
satanicoo Cooling Savant Join Date: Nov 2002 Location: portugal Posts: 635	fan controlers i have a fan thats still a bit noisy with 7 volt. with 5 it wont spin up. is there a way to build a fan controler that instead ov voltage, it controls the rpm? would it be hard? my idea is: build a circuit that sends impulses of 12 volts, so that it starts up, but never reaches high speeds, because they are only impulses.

04-22-2003, 03:09 AM	#2
Khledar Cooling Savant Join Date: Mar 2002 Location: North Vancouver BC Posts: 234	If you're going to build a circuit why not just build one that gives you about 6V ? Worried that's still too much? __________________ "mooooo" said the cow. ERTW - UBC P4 2.4B @3.01Ghz 167FSB :: Abit IC7 :: 2x256MB HyperX PC3700 :: ASUS 9600XT :: WD Raptor 2x36GB RAID0

04-22-2003, 10:25 AM	#3
BrianW Cooling Savant Join Date: Jun 2001 Location: Desert City in California Posts: 631	You will have to look, but there is already a circuit that does that. I believe some of the LCD's that have fan controllers have em. I'll look around when I get home from work. You could always go with a Rheobus (I think they go as low as 5 volts, not sure though) BrianW __________________ Water Cooled Inwin Q500 (Dual Rads: Rad1 = DTEK Pro Core \| Rad2 = Blick Ice Estreme, Hydor L30, Dangerden Maze2, Bay Res Typhoon Reservoir, 1/2 " DD Tygon Thick Wall Hose). Flow: Res, Pump, CPU watervlock, Y into both rads, both rads into res independently. Athlon XP 1800+ (@ 1731 - 150mhz fsb.), on a Asus A7N266-c, and a Radeon 9000 *waiting for RMA'd Saphire 9800 ultra from Newegg)

05-04-2003, 03:23 AM	#4
redleader Thermophile Join Date: Jun 2001 Location: The deserts of Tucson, Az Posts: 1,264	SVC sells some nice ones. I bought the Zalman baybus, but I'd probably get the Vantec instead.

05-10-2003, 07:22 AM	#6
Cyco-Dude Cooling Savant Join Date: Feb 2002 Location: Dayton, Ohio Posts: 836	its true that fans often wont start up on 5 volts, but once they are started they will run on 5 volts. start em on 12, then dail them down to 5. also, procooling just posted a preview of a PWM fan controller that you can read here if you havent already.

05-10-2003, 08:21 AM	#7
Aardil Cooling Savant Join Date: Oct 2002 Location: Louisiana Posts: 174	In referance to my PWM controller, that was the problem we found with the first proto type, it wouldnt start several models of fans. This was fixed in the final prototype and in in the production model. The problem was not all fans like PWM stutter voltage some took over 9 volts to get them going then you could throttle them back to around 5 volts. My circuit buffers the PWM spikes so that the signal is alot smoother and the fans will start at lower voltage without the normal PWM stutter. Just food for thought Aardil

05-10-2003, 10:05 AM	#8
Celestial_fury Cooling Neophyte Join Date: May 2003 Location: N Ireland Posts: 12	I bought this: I got it from www.coolputer.fi/ under the modding section there are 4 items called 'Speedlimit' for 2 or 4 fans. The Speedlimit 4 (LOPPU) is a kit with all components and a PCB for you to solder together (thats the one I bought). The non-LOPPU version is pre-built and costs twice as much. They do world wide shipping. What I like about it is that on Booting the pc, the fans run on full voltage for a couple of seconds, then throttle back to whatever setting you have on the Pots. You can also fine-tune the pots so that they wont dial down below a minimum voltage. I currently run the following config: POT 1: CPU Fan Coolermaster HHC-001 - 7000RPM Max (rpm monitoring still attatched to MOBO) POT 2: 120mm fan on side panel POT 3: 2X 80mm intake fans POT 4: 2x 80mm outtake fans FuRy

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