Yes it's just what I wanted so thanks for your time and patience, I think the fans work on two pulses per rev so maybe that's why it was only 3300rpm at first? I've also learnt a bit more about simple electronics, I've put together Velleman kits before but they don't require much more than basic soldering skills. I'd post a pic of my Pulse Gen but you'd only laugh at my poor layout etc
Check out my water cooling thread for the system build. (CPU is being cooled by coolant at 14°C).
Next part of the project is to put the tank 8 foot under which will give around 8°C water temp.
It's funny you should mention cooling your house as I thought the same the other day. If this water is coming out of the ground at 8°C to 10°C could that be cool enough for a household air conditioning system? It would certainly be very efficient to run, (compared to a real air conditioner), and as quiet as the circulation pump and fans you used. if This water flowed through heat exchangers positioned in the ceiling, I know it's not as cold as a true air conditioner but I Wonder if it would be cool enough to work? Interesting...........
[This message has been edited by BladeRunner (edited 06-27-2001).]
Yes I have seen the pics of your set-up. I work as a tech at an Air Traffic Control Center and when I show the Guys there your pics it always gets an amazed or comical reaction.
Lots of computers at the center and none of them overclocked. How much fun could we have hooking them into the Air Conditioning System? Ha Ha.
it is not finished yet, the square section with the large holes will be cut out soon but it is easier to hold and finish with it still there. The screw holes don't go into the water channel. keep an eye out for the full topic it will be true to my sketches. (when it's done).
I was testing my idea of linking larger detailed pics to small low quality jpgs, (to help reduce page load times), in the Asus topic below, so have a look there for more details.
This question although opposite is very similar. I am trying to figure out how to decode the signal coming from my fans. I may be wrong but from what was said the fan exports a square wave from 0v to 12v. I am using a basic stamp 2 to interpret the data by using pulsin to measure the length of each pulse. However its not working well at all. If anyone knows how to extract the signal from the fan or to do any part of what I tried to secribe I'd appreciate your help.
You could have just taken a small 50mm fan with RPM (the slow the better) and just cut the fins off. This will speed up the fan because of the lack of wind resistance and drage. You can likely run it at 5v too. You will likely not hear it running at all and you can shuve it somewhere were nobody can see it.
You also could have used an RPM sensing fan in the power supply and run the sensor wire to the graphics card.
A little late, but I tend to go for the simple and cheap solutions.
Originally posted by Machenti: This question although opposite is very similar. I am trying to figure out how to decode the signal coming from my fans. I may be wrong but from what was said the fan exports a square wave from 0v to 12v. I am using a basic stamp 2 to interpret the data by using pulsin to measure the length of each pulse. However its not working well at all. If anyone knows how to extract the signal from the fan or to do any part of what I tried to secribe I'd appreciate your help.
I am not sure what you are using there for equipment but it will be very hard to see anything without the fan hooked to the circuit. The fan itself supplies either an open circuit or a gnd.
The actual 12V of the detection circuit on the motherboard is supplied by the motherboard. When a ground is supplied by the fan this completes the Circuit so you get alternate pulses of 12V and 0V but no voltage is actulally coming from the fan. The fan only controls the voltage coming from the motherboard itself.
Cyril, how difficult (if possible?) would it be to modify that schematic so that the output from a fan that only provides the NC/GND cycle would be converted into the RPM pulse?
I have a high speed 120mm Delta fan (three of them actually) which I would like to use in a server I'm building. The fan comes with the yellow NC/GND lead, but the remote monitoring system (DarkSite) I'll be using requires the pulse wire.