Search found 36 matches

by dinofx
Wed Jan 16, 2008 10:07 am
Forum: Deals, Vendors and Classifieds
Topic: FS: PWM->analog Voltage Controller Circuit for pumps/fans
Replies: 17
Views: 19063

Sorry, haven't visited in quite some time...

I haven't been to this site for almost a year, but I'm back. Sounds like there is a constant trickle of interested buyers. I've sold 6 of these to date (never heard a complaint), and still have 24 PCBs available. I'm short on heatsinks, but I could get the parts from futurlec in about 2 weeks, in wh...
by dinofx
Thu Dec 21, 2006 7:46 am
Forum: Deals, Vendors and Classifieds
Topic: FS: PWM->analog Voltage Controller Circuit for pumps/fans
Replies: 17
Views: 19063

Thanks for the bump! I haven't had much time to visit the forum recently, but I still have 24 unassembled PCBs, and the parts for at least 12.

This circuit has been running almost non-stop in my Shuttle XPC for a long time.
by dinofx
Fri Sep 15, 2006 6:08 am
Forum: Deals, Vendors and Classifieds
Topic: FS: PWM->analog Voltage Controller Circuit for pumps/fans
Replies: 17
Views: 19063

gb115b wrote:out of interest, have you tested this on any pwm supporting intel motherboards (to see if the fan can still be controlled)
I'm not sure I understand what you mean. My original usage was inside my Shuttle SD31P, which is an Intel chipset. A recent buyer has had success with one of the AMD chipsets.
by dinofx
Tue Sep 12, 2006 5:49 am
Forum: Deals, Vendors and Classifieds
Topic: FS: PWM->analog Voltage Controller Circuit for pumps/fans
Replies: 17
Views: 19063

how much would it be for you to ship 1 to the uk. also. strictly speaking this is a pwm-> analog dc convertor (not controller) it relies on the m/b for control right? Indeed, you are correct. Although, most people are shopping for a "fan controller", not thinking about the fact that the MB has sens...
by dinofx
Thu Sep 07, 2006 6:26 am
Forum: Deals, Vendors and Classifieds
Topic: FS: PWM->analog Voltage Controller Circuit for pumps/fans
Replies: 17
Views: 19063

Bumping due to interest in the fan control forum.
by dinofx
Thu Sep 07, 2006 6:25 am
Forum: Fans and Control
Topic: PWM-->Analog Fan controller for conventional 3-pin fans
Replies: 42
Views: 23994

Hi dinofx, did you say you has some of these for sale? :) Yes, we should be discussing potential purchases on my original thread in the classified forum. http://forums.silentpcreview.com/viewtopic.php?t=31684&highlight= I think it is valid to discuss usage/design/behavior/results, etc. in this thre...
by dinofx
Wed Sep 06, 2006 12:51 pm
Forum: Fans and Control
Topic: PWM-->Analog Fan controller for conventional 3-pin fans
Replies: 42
Views: 23994

i'd be interested in a few? i'm just getting my new core duo system... so would like one for the cpu and ati are using 4 pin pwm in their latest series of cards... I have some available. What are your plans for the ATI card? Are you replacing the stock cooler (I'm assuming it's PWM) with an older 3...
by dinofx
Wed Aug 23, 2006 7:48 am
Forum: Fans and Control
Topic: Fan Headers?
Replies: 19
Views: 4638

Wow, your aunt needs dual DVD burners? I wish I had an aunt like that.

Regarding fan control/noise, why not dynamically control the fan speed based on what the user is doing at the time.
by dinofx
Wed Aug 23, 2006 7:28 am
Forum: Fans and Control
Topic: PWM-->Analog Fan controller for conventional 3-pin fans
Replies: 42
Views: 23994

dinofx -- Also, you should know that I've seen in a recent Gigabyte(?) AM2 board fan controls in the BIOS that includes a switch between PWM and voltage control. This is on a board with a 4-pin CPU fan header. This sounds like welcome flexibility if you are just controlling fans, which typically on...
by dinofx
Tue Aug 22, 2006 7:04 am
Forum: Fans and Control
Topic: PWM-->Analog Fan controller for conventional 3-pin fans
Replies: 42
Views: 23994

I have been using this circuit without problems for many months. Another modder recently used one in his AMD-based motherboard. It worked perfectly, although that particular motherboard required a fan with tachometer signal or else you could not reduce the speed. I have 3 assembled boards ready for ...
by dinofx
Mon Jul 10, 2006 7:09 am
Forum: Fans and Control
Topic: The new Evercool quiet, low RPM fans
Replies: 5
Views: 2775

8.7db? I think my gall bladder makes more noise than that. I don't even see how someone could have claimed to measure that low of noise.
by dinofx
Sat Jul 08, 2006 3:14 pm
Forum: Fans and Control
Topic: PWM-->Analog Fan controller for conventional 3-pin fans
Replies: 42
Views: 23994

You do not need to modify your fan's wires. In my case, the top fan is a Panalfo 80x15mm that did not come with tachometer. Only the bottom position fan/device can report tach to the motherboard. The other is NC.
by dinofx
Thu Jul 06, 2006 5:55 pm
Forum: Fans and Control
Topic: PWM-->Analog Fan controller for conventional 3-pin fans
Replies: 42
Views: 23994

The circuit expects an input with an average voltage of between 0.0 and 4.3 volts, since that is what Intel's PWM spec states. The resistors could be swapped out to support some other range.
by dinofx
Thu Jul 06, 2006 7:47 am
Forum: Fans and Control
Topic: PWM-->Analog Fan controller for conventional 3-pin fans
Replies: 42
Views: 23994

Just curious, why two-pin headers instead of three-pin? One nice feature of the NMT-2 and -3 is pass-through of the RPM sense signal on the third pin. That way you can use standard fan connectors. Your device with 3-pin headers would be ideal for PWM motherboards and standard fans (no need to repla...
by dinofx
Thu Jun 22, 2006 10:38 am
Forum: Fans and Control
Topic: speedfan help - fans speed up and down too quickly
Replies: 5
Views: 3487

The algorithm SpeedFan uses for adjusting speed is one of the most brain-dead approaches I have ever seen. It never changes by more than the delta value. You can't assign different deltas to different fans. For example, I have one fan that goes from 24-60%, and another that goes from 25-90%. The fir...
by dinofx
Sat Jun 17, 2006 7:18 am
Forum: Fans and Control
Topic: Level shifter question
Replies: 6
Views: 2127

How does the fan controller work? Are its internals exposed? I know on mine, I can replace 2 of the resistors and change the range from 7.4-12 to 6.0-12.
by dinofx
Tue Jun 13, 2006 5:40 am
Forum: Fans and Control
Topic: 4 pin quiet fans?
Replies: 6
Views: 2677

The JMC fans are pretty quiet. I can't really hear my 120mm until it reaches about 1100 RPMs. I think it goes up to about 2700 rpms. My only complaint is the size of the dead spot in the middle of the fan. Compared to the really noisy, silver, SilenX fans, the motor in the center of the JMC fan is h...
by dinofx
Mon Jun 12, 2006 11:00 am
Forum: Fans and Control
Topic: PWM-->Analog Fan controller for conventional 3-pin fans
Replies: 42
Views: 23994

Special offer: $28 assembled, tested, and shipped, to first person who PMs me. The only limitation is that you must be ready to use the circuit in your existing system with PWM fan headers.
by dinofx
Fri Jun 09, 2006 6:40 pm
Forum: Fans and Control
Topic: PWM-->Analog Fan controller for conventional 3-pin fans
Replies: 42
Views: 23994

To clarify, I was referring to motherboard specs, not the fanamp. According to Intel, a motherboard fan header is good for 12W. The older version of the Laing water pump was 11W, but it would be a mistake to try to plug it into a fan header.
by dinofx
Fri Jun 09, 2006 9:01 am
Forum: Fans and Control
Topic: PWM-->Analog Fan controller for conventional 3-pin fans
Replies: 42
Views: 23994

I remember reading specs stating 1 amp, or 12W, for each fan header, but I don't plan on testing that limit any time soon.
by dinofx
Thu Jun 08, 2006 6:41 pm
Forum: Fans and Control
Topic: M-Cubed miniNG......mini review.
Replies: 13
Views: 5685

It's most likely that one screw in the middle to remove the heatsink, but even so you might be looking at the back side of the MOSFET. A voltmeter would also answer the question. Just compare ground to the fans ground at less than 100% "throttle"
by dinofx
Thu Jun 08, 2006 6:05 am
Forum: Fans and Control
Topic: PWM-->Analog Fan controller for conventional 3-pin fans
Replies: 42
Views: 23994

The FanAmp has a connector to a MB fan header, a header that has MB fan control. If your board can automatically adjust fan voltage from 7-12V, the fan amp can use that signal to automatically send an analog voltage to your fan. It gets power from a molex connector, and has a temp sensor if your bo...
by dinofx
Wed Jun 07, 2006 11:54 am
Forum: Fans and Control
Topic: M-Cubed miniNG......mini review.
Replies: 13
Views: 5685

Perhaps this device is using an N-channel MOSFET instead of the less popular P-channel. This would mean that in analog mode, the fan's ground is reaised instead of its postive voltage lowered. This would explain why the tachometer fails, as the fan would no longer have a true ground. Can one of the ...
by dinofx
Wed Jun 07, 2006 11:14 am
Forum: Fans and Control
Topic: PWM-->Analog Fan controller for conventional 3-pin fans
Replies: 42
Views: 23994

Here is a review of the MiniNG . It has some drawbacks, including difficult configuration, slow response time, and tricky temp. probe placement. I know that my Pentium 4 with EIST and SpeedStep can change thermal output considerably over a very short period of time. I didn't get a good feeling for h...
by dinofx
Tue Jun 06, 2006 5:11 pm
Forum: Fans and Control
Topic: PWM-->Analog Fan controller for conventional 3-pin fans
Replies: 42
Views: 23994

Neat idea, I like it. Is the amplifier (LM741) set up to integrate the pulses and provide a proportional output, with a MOSFET to provide extra current? Also, soldering 1206s isn't all that difficult, if you have a reasonably good iron, tweezers, and solder-wick to clean up any mistakes. Of course,...
by dinofx
Tue Jun 06, 2006 4:50 pm
Forum: Fans and Control
Topic: PWM-->Analog Fan controller for conventional 3-pin fans
Replies: 42
Views: 23994

I have a few of each. The Fan-Amp costs less than your unit....the miniNG costs slightly more. Neither require any software to run, in fact don't come with any. They use their temp sensors to control fan speed.....you cannot read the temps of these sensors. Those sound similar. The only difference ...
by dinofx
Tue Jun 06, 2006 9:10 am
Forum: Watercooling
Topic: WHOA!!! check out how zalman will beat them all :)
Replies: 20
Views: 8748

Anodized in gold? What is the point? Copper is a better conductor of heat.
by dinofx
Tue Jun 06, 2006 7:51 am
Forum: Fans and Control
Topic: PWM-->Analog Fan controller for conventional 3-pin fans
Replies: 42
Views: 23994

I admire your ability to solder those surface mount resistors. However I doubt many modders attempting to assemble a kit, would find it so easy. Ruin one and finding another would be difficult. Which brings up the cost of an assembled unit...not bad. But you are competing with some devices with sim...
by dinofx
Mon Jun 05, 2006 7:42 pm
Forum: Fans and Control
Topic: PWM-->Analog Fan controller for conventional 3-pin fans
Replies: 42
Views: 23994

frankgehry wrote:What size are the surface mount resistors in your project - 1206? TIA
Yes, they are 1206. It was not as hard to solder as I expected.
by dinofx
Mon Jun 05, 2006 7:41 pm
Forum: Fans and Control
Topic: PWM-->Analog Fan controller for conventional 3-pin fans
Replies: 42
Views: 23994

Looks pretty good - am I right in thinking this does a similar job to the attenuator available with the T-balancer to smooth out PWM into a more analogue voltage signal? If so that's exactly the kind of thing we need more of (IMO) to fix PWM controllers. Do you have any plans to market these, and i...