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Unread 03-23-2006, 06:07 AM   #28
mx
Cooling Neophyte
 
Join Date: Oct 2005
Location: Sweden
Posts: 73
Default Re: Varying pump speed possible?

mCubed always answears all your questions, they seem to know allot!

Quote:
Originally Posted by masocr79
now here's a question .. anybody know of a way to overvolt the DDCs to the optimal 13.2 Volts along a similar lines .. using some kind of software and a sendary PSU .. ?
I'm working on it. I have a external 3-15V 40A PSU that's regulated by a potentiometer. My plan is to replace this pot with something that I can control /w the miniNG output. I'm no good at electronics so I'm not sure how to do it.

It's a 10 kOhm potentiometer and it regulates the resitance between three wires, non of them connected to ground and the voltage never exceeds 12V. Zero resitance between the first and second wire means a 3V output. Zero resitance between the second and third wire means 15V output. One alternative is to build some kind of voltage regulated resistor, a digital potentiometer /w 3-12V input and 10 kOhm resistance. Maybe I don't need any circuit between the PSU and miniNG, maybe I only need to replace the pot with the miniNG?

The whole idéa of regulating the input voltage to the DDCs is kinda overkill since their already very quiet. But I don't want to modify my PSU just to control the the pumps, that's just the first step. When I've got it working I plan to regulate my peltiers input voltage /w the same method. This way peltier cooling wouldn't be such a waste of energy and since the TECs wouldn't always be on max voltage I wouldn't always have to run the fans on the rad on full speed to cool them. I've replaced the alu fans with Yate Loon D12SL-12 fans btw, couldn't stand the noice!

It would be nice if I could control the PSU with just on of the miniNGs channels. Then I could get a weaker PSU to power the pumps and regulate it with the miniNGs second channel!
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