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12V PSU to 13.8V

post #1 of 23
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Does anyone know how I can bump up the 12V on a PSU to 13.8V for my 18W Laing DDC water pump with out having to resort to an external transformer? Something I could run off a 4-pin in the PSU. The reason for this is that I can gain a 1/2 gal per minute on flow and about 3 ft more head with the over volt. Thanks in advance.....
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post #2 of 23
If you somehow could join the 12v and 5v line, do that and put a resistor on the 5v.
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post #3 of 23
Thread Starter 
Quote:
Originally Posted by gonX
If you somehow could join the 12v and 5v line, do that and put a resistor on the 5v.
Good idea, I would just need to figure out what size resister to lower the voltage to 13.8V Thanks..Anyone else?
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post #4 of 23
Get an adjustable resistor.
Keep adjusting it down untill you find the correct voltage. Use a voltmeter to help.
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post #5 of 23
Thread Starter 
Quote:
Originally Posted by gonX
Get an adjustable resistor.
Keep adjusting it down untill you find the correct voltage. Use a voltmeter to help.
Thanks, Do you think it might cause feedback on one of the lines or would the resistor stop it?
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post #6 of 23
I think a diode could prevent this. Obviously before the resistor.
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post #7 of 23
Combining a 12V and a 5V line wont increase voltage. In fact it will decrease voltage because the 12V rail will bleed off into 5V the rail and possibly damage anything connected to the 5V rail, including the PSU. The only way to overvolt it past 12V would be to connect it to the -5V or -12V rail, which would give you either 17V or 24V. However, most new PSUs dont even have a -5V anymore since that was used for ISA slots, and in most cases the -5V/-12V rail carries less than one amp, so it would not be sufficient to power an 18W pump.
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post #8 of 23
I sure do hope this PSU is dedicated to water cooling only! I would not do this experiment with a PSU that powers the rest of your rig...
    
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post #9 of 23
Thread Starter 
Quote:
Originally Posted by HrnyGoat
Combining a 12V and a 5V line wont increase voltage. In fact it will decrease voltage because the 12V rail will bleed off into 5V the rail and possibly damage anything connected to the 5V rail, including the PSU. The only way to overvolt it past 12V would be to connect it to the -5V or -12V rail, which would give you either 17V or 24V. However, most new PSUs dont even have a -5V anymore since that was used for ISA slots, and in most cases the -5V/-12V rail carries less than one amp, so it would not be sufficient to power an 18W pump.
That was my concern with the feed back. I was thinking along the lines of some sort of capaciters. Thanks...
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post #10 of 23
Thread Starter 
Quote:
Originally Posted by Chozart
I sure do hope this PSU is dedicated to water cooling only! I would not do this experiment with a PSU that powers the rest of your rig...
It will be. I'll be using the Ultra x-connect 2 in my sig ..Thats all it's good for, if even that... EDIT: I want to thank every one for there help! I have been looking around some more and think I will be going with something like this, have to research more to get the exact one I want.....Thanks again.........18 volt power supply and battery index
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