changing the voltage

computerman · 07-July-06, 12:12 PM

Pretty much what i'm wondering is since the fan connector has both 5v line and 12v line can i snip off the 12volt line and just have it run through the 5volt and it will work fine? or will this deem the fan useless? im wondering because i dont want a fan controller, and i dont want the fans running full speed.

Nerdz · 07-July-06, 03:09 PM

Go for 7 volts then!
http://www.cpemma.co.uk/7volt.html

computerman · 07-July-06, 03:35 PM

my fans have the 3 pin connector and i dont feel like having to find\buy 3-4 pin.

Sn0wMan · 07-July-06, 03:45 PM

I think the same thing applies with the 3 pin connector. Just get yourself a small screwdriver or a pin remover and you should be all set.

Nerdz · 07-July-06, 03:47 PM

Well if you run it off of 5V there might not be enough voltage to start the fan, if you dont mind snipping the wires you can make 7V. Im guessing you have +12, +5 amd ground on your 3 pin connector? Usually its +12, Tach, ground. If so, you can just cut the power wires off, and leave the tach on. You can solder the wires to a regular 4 Pin connector.

computerman · 07-July-06, 04:30 PM

with the 3 pin it goes 12,5,ground. with the 4 pin it seemed like i was moving the 5v to the ground? im not sure it was hard to follow any clarificatio would be nice thanks guys.

Nerdz · 07-July-06, 04:35 PM

No, your using the +5 as ground and the +12 as Positive. Its the same thing as if you used -12 for ground and +12 for positive you would get +24V.

Sn0wMan · 07-July-06, 04:36 PM

I can't say for sure about the 3 pin, but in order to change the 4 pin you just swap the 12v and 5v so when it goes through your PSU it doesn't get the 12V it only gets 5

computerman · 07-July-06, 04:53 PM

oh, i get it, so its doing -5 +12 so there for result is 7volts, ill play around with the 3 pin connector tonight on my extra PSU and let you guys know.

EDIT:
wait though, isnt the 3 pin different. isnt one of the wires for the sensor?

07-July-06, 12:12 PM		#1 (permalink)
computerman Apex Master Tech	changing the voltage Pretty much what i'm wondering is since the fan connector has both 5v line and 12v line can i snip off the 12volt line and just have it run through the 5volt and it will work fine? or will this deem the fan useless? im wondering because i dont want a fan controller, and i dont want the fans running full speed.

07-July-06, 03:09 PM		#2 (permalink)
Nerdz Sir Knight of Spamalot	Re: changing the voltage Go for 7 volts then! http://www.cpemma.co.uk/7volt.html

07-July-06, 03:35 PM		#3 (permalink)
computerman Apex Master Tech	Re: changing the voltage my fans have the 3 pin connector and i dont feel like having to find\buy 3-4 pin.

07-July-06, 03:45 PM		#4 (permalink)
Sn0wMan Apex Tech Demi-God	Re: changing the voltage I think the same thing applies with the 3 pin connector. Just get yourself a small screwdriver or a pin remover and you should be all set.

07-July-06, 03:47 PM		#5 (permalink)
Nerdz Sir Knight of Spamalot	Re: changing the voltage Well if you run it off of 5V there might not be enough voltage to start the fan, if you dont mind snipping the wires you can make 7V. Im guessing you have +12, +5 amd ground on your 3 pin connector? Usually its +12, Tach, ground. If so, you can just cut the power wires off, and leave the tach on. You can solder the wires to a regular 4 Pin connector.

07-July-06, 04:30 PM		#6 (permalink)
computerman Apex Master Tech	Re: changing the voltage with the 3 pin it goes 12,5,ground. with the 4 pin it seemed like i was moving the 5v to the ground? im not sure it was hard to follow any clarificatio would be nice thanks guys.

07-July-06, 04:35 PM		#7 (permalink)
Nerdz Sir Knight of Spamalot	Re: changing the voltage No, your using the +5 as ground and the +12 as Positive. Its the same thing as if you used -12 for ground and +12 for positive you would get +24V.

07-July-06, 04:36 PM		#8 (permalink)
Sn0wMan Apex Tech Demi-God	Re: changing the voltage I can't say for sure about the 3 pin, but in order to change the 4 pin you just swap the 12v and 5v so when it goes through your PSU it doesn't get the 12V it only gets 5

07-July-06, 04:53 PM		#9 (permalink)
computerman Apex Master Tech	Re: changing the voltage oh, i get it, so its doing -5 +12 so there for result is 7volts, ill play around with the 3 pin connector tonight on my extra PSU and let you guys know. EDIT: wait though, isnt the 3 pin different. isnt one of the wires for the sensor? Last edited by computerman; 07-July-06 at 08:04 PM..

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