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Connecting 6fans to a 12v and a 5v button

post #1 of 7
Thread Starter 
Hi guys, I want to connect 6 fans for a rad so that I can power them 12v or less.

I have 2 spare buttons and wanna ask you if following will work and if it does what I want:

A single +12v yellow cable from a 4 pin connector goes through the button to the red cable of the fans.

Another single +5v red cable from a 4pin connector goes through another button to the same red cable of the fans.

The ground cables of the 4pin connector attached to the fan ground.

So what will happen if i power on the 12v?
What if I power on the 5v?
What if I power on both?

Will I have them running at 12v and 7v (12-5)?

I dont wanna break anything not the pau and not something else, so I'd apreciate a 100% sure answer or tell me if you aren't.


Fan are noiseblocker M12-s3hs
Psu is sylverstone 1500v





(If you wonder why I don't buy a fan controller it is because the 4 channel fan controller I have is plugged with another 7fans and a pump, the chassis has another 5 fans already plugged so I must find another way. Yes I know there are many fans... :-D 4rads and another lot of stuff)
post #2 of 7
This any help?
Black Noise
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Black Noise
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post #3 of 7
Thread Starter 
Quote:
Originally Posted by Big Elf View Post

This any help?

Thanks mutch but... It helps indirectly. He's using double poled switches where he has 1 ground and 1 5v and 1 12 volt cables to them. The switch already does 12 OR 5.

!!! I see when he connects 12v and 5v as ground, he gets 7v.
Means if I do what I thought, I have a short of 7v as soon as I switch both buttons on (12 and 5 on one side and black on the other?

Too bad I don't remember anymore about electricity frown.gif
post #4 of 7
what do you mean by buttons?
are they simple on off buttons? if yes:
wire 12v straight to fan power wire.
the next 2 would be connected to the ground wire of the fan and you can only have 1 (ONE!) button button pushed at a time:
1) - set 1 button to ground when the button is pushed, open if 'un'pushed. when pushed this is 12v
2) - set button 2 to 5v when button is pushed, open if 'un'pushed. when pushed this is 7v

if you push both buttons at the same time, you better hope your psu shuts off when sensing short circuits or you will be buying another.

remember, some fans dont start when voltage is too low.
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w00t
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post #5 of 7
FWIW: Using the 5v as a ground for an effective 7v has been done a many a time, and it reportedly works fine with many if not most fans but with others not-so-much. I've never tried it out myself, but I do remember reading all the responses in the forum post that accompanied this article ...

Easy 7V Mod for Fans
http://www.techpowerup.com/articles/other/137

Some fans ran fine at reduced speed and some reportedly didn't run at all or worse, never ran again after trying it.
post #6 of 7
Thread Starter 
Quote:
Originally Posted by pc-illiterate View Post

what do you mean by buttons?
are they simple on off buttons? if yes:
wire 12v straight to fan power wire.
the next 2 would be connected to the ground wire of the fan and you can only have 1 (ONE!) button button pushed at a time:
1) - set 1 button to ground when the button is pushed, open if 'un'pushed. when pushed this is 12v
2) - set button 2 to 5v when button is pushed, open if 'un'pushed. when pushed this is 7v

if you push both buttons at the same time, you better hope your psu shuts off when sensing short circuits or you will be buying another.

remember, some fans dont start when voltage is too low.
Wow thanks for the explaining I understand I'll keep those on of buttons for cathodes and find another way wink.gif

Unless there is a safe way and a 7v cable that can be used alone and together with a 5v to make 12v.
But I don't know if electricity works like that
post #7 of 7
no. to get 7v, you use the 12v as the 'hot' wire (red on a fan) and the 5v as the ground wire (black on fan)

2 ways to get all 3 voltages (5v+7v+12v)
1) 4 toggle switches (too much hassle and space)
2) 2 single pole double throw switches as in the link big elf posted
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