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Pump speed controller - Page 2

post #11 of 19
Quote:
Originally Posted by magus.tsf View Post
He doesnt want to control noise, he wants to control flow rate. He intends to experiment with this system to see if he gets better cooling with higher fan speeds and lower flow rate or the other way around. He's a mechanic by trade and is convinced that the high flow rate will limit the effectiveness of the liquid to cool.

I already suggested the d5 and a clear bay res to keep the look he wants.

No go

Any other suggestions?

And was gonna limit the voltagess to between 7 + 12 volts
Sure,

It would be really easy to make a switch for the DDC 3.2 or 3.1 and have it switch the pump between a 10watt pump and an 18 watt pump. All you'd have to do is wire a switch between these two contacts and you'll have a safe way to go back and forth.

So rather than soldering, a nice small wire between the two with a simple rocker switch would do..


A fan controller would work too, but I'd probably use a single one buried and protected inside the case if I was going to do that. I just wouldn't trust myself with the knob on the front of the case. My 5 year old son and even my nearly 2 yr old daughter like buttons and turning knobs WAY too much. The switch would give you a 2 speed adjustment and be fail safe.
    
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post #12 of 19
I have the 12V Laing DDC-1T Plus Ultra with a plexi top and have it mounted on the antivibration mounts supplied with it.

It makes no noise what so ever, you'll never hear it above the case fans ever I guarrentee. If you mount it on the antivibration mounts you wont feel a thing through your case and even when you place a finger on the pump you only feel a small weak constant vibration. I couldnt rate my pump any higher, truely the best imo.

Just need to cool my 8800gt since that is the loudest thing in my system once a 3d app starts
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post #13 of 19
Thread Starter 
Quote:
Originally Posted by MartinM210
A fan controller would work too, but I'd probably use a single one buried and protected inside the case if I was going to do that. I just wouldn't trust myself with the knob on the front of the case. My 5 year old son and even my nearly 2 yr old daughter like buttons and turning knobs WAY too much. The switch would give you a 2 speed adjustment and be fail safe.
This is the system he wants to use, could it be wired then so he gets two set speeds? and how would you wire it up.
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post #14 of 19
Quote:
Originally Posted by magus.tsf View Post
This is the system he wants to use, could it be wired then so he gets two set speeds? and how would you wire it up.

Sorry, I somehow I just assumed it was a DDC.

No, that would have to be adjusted by a a rheostat, although it's a very quiet and smaller pump, so I would just leave it at 12V if it were my system.

I found the shutoff points for that pump were around 5.1V at the low end, and I only tested up to 13V which it still ran fine. I have the review on my site, and here is a quick video for sound level check.

I only got a 3db gain over very quiet ambient levels, so it fits within the "barely perceptable" noise category if you can prevent vibrations from transfering to the case.


Edited by Martinm210 - 5/27/08 at 11:26am
    
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post #15 of 19
Thread Starter 
what rating rheostat would you suggest. As i sais earlier He wants to experiment, i'm just the poor sap who has to make it work for him.
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post #16 of 19
Quote:
Originally Posted by magus.tsf View Post
what rating rheostat would you suggest. As i sais earlier He wants to experiment, i'm just the poor sap who has to make it work for him.
You don't need much, I found the pump only draws a maximum of around 9 watts.



Something like this 25 watt rheo would be more than up to the task if he wanted to tuck it away in the case.
http://www.sidewindercomputers.com/sirh25wa.html

Or this (Probably the strongest quality multifan rheo out (30 watts per channel with heatsinks):
http://www.ncixus.com/products/28419/RHK-EX-BK/Sunbeam/
    
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post #17 of 19
Thread Starter 
Hellscrean said ealier that the sunbeam was easy to strip down to seperate rheoststs.

So, final question.

If I used this what would be the best way to wire it so it was limited between 7 & 12 volts?


Edit: I think I've got it. Using a 3 pin rheostat, pin 1 to +12v, pin 2 to ground, pin 3 to 7v (+12v & -5v). That should give a varience only between the 2 voltages correct?
Edited by magus.tsf - 5/27/08 at 11:57am
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post #18 of 19
I'm pretty limited on my electronics, but I understand a rheo is nothing more than a variable resistor and the higher resistance the lower the output voltage. If you knew enough about circuits you might be able to replace some of the resistors to something with lower resistance.

Or if there was a way to limit the rotation of the knob? Theoretically it won't produce anymore than the power supply so the top end is limited anyhow, it's just the lower end you need to protect.

Here is some reading material:
http://www.cpemma.co.uk/rheo.html


You might be able to buy a rheostat with the desired range too, I'm just not sure where or what resistance value you'd want. You'd have to calculate the supplied voltage and maximum resistance wanted to get the minimum voltage you need.
    
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post #19 of 19
Thread Starter 
what would be the best way to get the supplied current, multimeter across the terms when the pump is running? Sorry if all the questions seem noobish but I have never had to frankenstein something together like this before.
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