How Many Fans in Your System Unit

[Anusha]

You can also use two way switches to make the fans work at either 12V (default) or 7V. You can give the yellow wire from the molex connector permanently to the positive terminal and either the red wire (5V) or a black wire (ground) using a two way switch to the negative terminal to make them work at 7V and 12V respestively. You can use the 12V supply when doing heavy tasks and 7V supply when not doing much work.

This way, you are not wasting power either. If you use a resister, then even when you turn down the RPM, it will still dissipate the same amount of power as at max RPM. I know, it's a small power, but we should try to cut power as much as we can, if we can. Think of how much electricity we will be saving when we add them all up from everyones's PCs.

 

[pasanlaksiri]

You can also use two way switches to make the fans work at either 12V (default) or 7V. You can give the yellow wire from the molex connector permanently to the positive terminal and either the red wire (5V) or a black wire (ground) using a two way switch to the negative terminal to make them work at 7V and 12V respestively. You can use the 12V supply when doing heavy tasks and 7V supply when not doing much work.

This way, you are not wasting power either. If you use a resister, then even when you turn down the RPM, it will still dissipate the same amount of power as at max RPM. I know, it's a small power, but we should try to cut power as much as we can, if we can. Think of how much electricity we will be saving when we add them all up from everyones's PCs.

But y dont u try to make a circuit for drive fans automatically. Its really interesting.

 

[Anusha]

But y dont u try to make a circuit for drive fans automatically. Its really interesting.

Automatically means, thermally adjusted fans? Yeah you can do that

 

[shanX]

Such as?

such as casing fans

there r fans with speed controllers ucan buy them,controller fits in at pci card window of casing.
U can build them for about 40~50 rs.needs just two wires and a variable resistor like in radios..
Pasan will be very kind to help us out,wont you???

pci card window??? where to buy fans with speed controllers?? OMG electrics, i wonder why they dont work for me....

You can also use two way switches to make the fans work at either 12V (default) or 7V. You can give the yellow wire from the molex connector permanently to the positive terminal and either the red wire (5V) or a black wire (ground)

cud we cut wires and switch em? to switch voltages

But y dont u try to make a circuit for drive fans automatically. Its really interesting.

 

[Anusha]

cud we cut wires and switch em? to switch voltages

You don't have to cut them. You can carefully get them out of the molex connector using a hard pin (you have to bend the two small notches that's prevtning them from loosening), and interchange the 0V and 5V (red) and you'll get 7V (12V - 5V).

 

[shanX]

omg no idea! btw thnx!

 

[Anusha]

omg no idea! btw thnx!

 

[zCexVe]

ou don't have to cut them. You can carefully get them out of the molex connector using a hard pin (you have to bend the two small notches that's prevtning them from loosening), and interchange the 0V and 5V (red) and you'll get 7V (12V - 5V).

I dont get how we get 7V frm interchanging 5v & 0v.I only knw to get by interchanging +12V yellow and -5V black with red one..

 

[zCexVe]

But y dont u try to make a circuit for drive fans automatically. Its really interesting.

I need the circuit , parts and estimated cost buddy
where can we find heat sensors
I got messed up while fitting my CPU heat sensor.I fitted it between CPU and CPU Cooler,sothat when i fitted it coz of the pressure the heat sensor was flatted[the tiny little resistor]
I got a CPU heat sensor frm PIII mobo and fitted it .
Its sensing is gr8 than the previous one
But i'd like to buy them if i'm making a circuit..

 

[zCexVe]

BTW Anusha ayya I forgot that u learn @ "Electronics & Telecom" division..

 

[Anusha]

I dont get how we get 7V frm interchanging 5v & 0v.I only knw to get by interchanging +12V yellow and -5V black with red one..

There are no negative voltages coming out of any connector They only go into the motherboard through that big ATX power cable. The normal molex connector has 12V, 0V, 0V, 5V. Besides, +12V and -5V will give you 17V!!!

 

[Anusha]

Check this out: http://www.heatsink-guide.com/content.php?content=control.shtml

 

[Anusha]

And this one too: http://www.virtual-hideout.net/guides/temp_controlled_fan/index.shtml

 

[vnc]

CPU FAN
VGA FAN
HDD FAN
CASING FAN
ADDITIONAL 2 FANS
ALL FANS ARE
6FANS

 

[vnc]

MORE FANS MAKE MORE NOISE
BUT
KEEP COOL CPU AS WELL
IT IS GOOD FOR WORK WITH MANY HOURS CONTINUESLY

 

[vnc]

I ADDED A FAN TO MY HDD
IT IS 300 GB SATA
IT IS TRY TO VERY HOT THEN I ADDED A FAN FOR IT
NOW IT IS COOL AS WELL

 

[zCexVe]

Well 4 how much did ya buy your HDD?
Did ya made a cooler 4 the HDD or just fitted a fan near it?

 

[zCexVe]

There are no negative voltages coming out of any connector They only go into the motherboard through that big ATX power cable. The normal molex connector has 12V, 0V, 0V, 5V. Besides, +12V and -5V will give you 17V!!!

Must learn my electronics well!these studies keep me away frm them..

 

[Anusha]

MORE FANS MAKE MORE NOISE
BUT
KEEP COOL CPU AS WELL
IT IS GOOD FOR WORK WITH MANY HOURS CONTINUESLY

More fan's is not always good. It can sometimes make things hotter!!! You might not believe it, but it can happen. You shouldn't let the air pressure build inside the case. It has to flow smoothly. The best configuration is, bringing the air into the case from the inlets in the lower front, and throw it out from outlets in the upper back (near the CPU). ATX standard is designed like that. AT motherboards had the CPU in the front, lower section, and this wasn't efficient when the CPUs become hotter and hotter. So they rearranged the ATX component placement.

It's even better if you have a duct in front of the CPU to bring the cool air in with the vacuum effect of the CPU fan, and a power supply unit which will take in the hot air around the CPU into itself and throwing outside from the back (i.e. two fans).

 

[Anusha]

I ADDED A FAN TO MY HDD
IT IS 300 GB SATA
IT IS TRY TO VERY HOT THEN I ADDED A FAN FOR IT
NOW IT IS COOL AS WELL

Which make and brand? I yesterday spotted in an article than Maxtor DiamondMax 10 dissipates very low power compared to all the other HDDs from other manufacturers. It was like 10W vs. 19W. Mine is a Maxtor DiamondMax 10 320GB, and I have to say, it's cooler than my 160GB Samsung! Samsung and Seagate generally make the coolest and quietest drives.