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12V PSU to 13.8V - Page 2

post #11 of 23
Quote:
Originally Posted by ira-k
That was my concern with the feed back. I was thinking along the lines of some sort of capaciters. Thanks...

the caps shouldn't do much on this since it is a DC cuicut. unless you are looking to smooth out the ripple a little more but that isn't goign to help in this case.

best thing I can think of doing is grabbing a dedicated supply for this or as someone else said use the one of the -v lines but then you would need to more current then the ps will prolly supply.
the only other thing I can think of is to use a DC-DC converter or convert to ac then multiply the voltage through a voltage doubler then use a a voltage divider.

either way is not going to be cheap/easy I would say

EDIT: ok so Im' late :-) I tried at least
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post #12 of 23
Thread Starter 
Thanks, That's what I decided to do get a DC-DC converter..
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post #13 of 23
well wish you the best but if nothing else I have one other solution that might work
I can always take taht water cooling system and figure out how to make it work.

just don't ask for it back I'll be tinkering with it for a LONG time
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post #14 of 23
Thread Starter 
Quote:
Originally Posted by rx7speed
well wish you the best but if nothing else I have one other solution that might work
I can always take taht water cooling system and figure out how to make it work.

just don't ask for it back I'll be tinkering with it for a LONG time
......
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post #15 of 23
dont attemp to do this unless the powersupply is going to be used only for the pump be evan this will be dangerous the powersupply will have a much higer chance of failing or parts may go postal what you should do is make your own you could make one for about $15. thats what i would recomend.
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post #16 of 23
Well in technicalities, if u hook up 2 power sources in SERIES, it should increase the voltage. But since this is done on ONE psu, i wouldn't try it. Finding a 12v DC to 13.8v DC converter would be challenging and quite likely to be costly. U can convert the current to 12Vac and then use a transformer to stepup the voltage to 13.8v, but that will be highly impractical and complicated to do... This is a though one. I suggest you just by a seperate dedicated 13.8v PSU.
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post #17 of 23
Quote:
Originally Posted by gonX View Post
I think a diode could prevent this. Obviously before the resistor.
omg you know nothing! first off it doesn't matter where a resistor is in a cuircut. second an "adjustable resistor" is called a potentiometer or POT. third of all combining the 5v and 12v rail will do NOTHING you would have to convert it to ac, up the voltage, then convert it to dc again. not worth it for 1.8v anything that works on 13.8vdc should be fine on 12v

edit:actually the best way would be to open up the psu and hijack the dc output before the VR and then get a combination of a VR and a resistor to bump it up. no telling what this will do to your system but it shouldn't have many if any ill effects
    
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post #18 of 23
Instead of a 2nd PSU, what about a toy train transformer? I can't seem to find any valid specs for output, but just a thought...
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post #19 of 23
Quote:
Originally Posted by dralb View Post
Instead of a 2nd PSU, what about a toy train transformer? I can't seem to find any valid specs for output, but just a thought...
Well thing is, a transformer only works with AC current, not DC. So u're gonna have to somehow convert the current back into AC and then use the transformer to step up, then rectify it back into DC. As i said b4, this ain't gonna be an easy task. If you're skilled and/or daring enough, you can try to build ure own 13.8v PSU...
heres a link:
http://sound.westhost.com/project77.htm

I'm gonna build meself one for my car audio setup later on
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post #20 of 23
Quote:
Originally Posted by mashersmasher View Post
omg you know nothing! first off it doesn't matter where a resistor is in a cuircut. second an "adjustable resistor" is called a potentiometer or POT. third of all combining the 5v and 12v rail will do NOTHING you would have to convert it to ac, up the voltage, then convert it to dc again. not worth it for 1.8v anything that works on 13.8vdc should be fine on 12v

edit:actually the best way would be to open up the psu and hijack the dc output before the VR and then get a combination of a VR and a resistor to bump it up. no telling what this will do to your system but it shouldn't have many if any ill effects
....what are you talking about?

1) A resistor reduces current draw to help prevent the motor from frying.
2) For the load, a rheostat might be more suited. However there is nothing wrong with saying an adjustable resistor.
3) Combining the +5v and +12v yields +7v.

A step up transformer can be used.
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