I have an old computer cpu fan that I thought I could turn on by connecting the red wire to 12 volt dc supply and black wire to ground.
To my suprise I couldn't get it to move at all.
Their is 3 wires on this fan
red = VCC
black = ground
white = s = signal RPM
I even tried connecting white to the 12volt supply and removing it then connecting it ....etc nothing moved still?
When I plugged it back into the computers mobo and started the mobo/computer it spun like normally.
WTF ???
The fan
model is 0925-12HBTA DC 12volt 0.60 A Brushless DC FAN by JMC DATECH
Question 2
I have another cpu fan that is the same as that one but with 0.80 A.
So I thought I could substitute the 0.6 A fan for the 0.80 A fan on the mobo. Both have the same connector and fit fine on the mobo and both use 12 volt dc.
Didn't think the 0.20 Amps would make a big difference or at least I would see some spin or something. To much my suprise I saw nothing got to bios "post" beeps and a screen saying the cpu fan could not be detected.
So are mobo so current specific if so are their any standards on what a mobo current must be. I just find it hard to believe that 0.2 amps makes that much of a difference thought I would see something spin at some rate ?
Is their any fan standard for what a fan can have for amps or something or what mobo it can be used on? Because you can pickup fans at radioshack/bestbuy ,...etc and most people won't be looking for amps when buying they just buy ?
I do admit these computers/fans where bought in 2000 so maybe they have a standard now anybody know?
This all got me thinking if I ever have to replace a computers fan I have to look at the amps it runs on and know what the mobo amps are. All computers I know run on 12 volt dc but some of them run on more amps then others. So I would assume that fans are mobo specific as well as memory ,...etc never thought about the fan that way.
Guess the small circuitary of the fan amps needs to corrospond to the amps of the mobo.
Anybody that knows more please let me know.
It all sounds pretty sketchy that you have to know the computer mobo amps this is why I think their must be a standard now. Unless they are figuring out the amps of a mobo by the power of the power supply divide by the 12 volts = current
Thanks for any input or clarity
To my suprise I couldn't get it to move at all.
Their is 3 wires on this fan
red = VCC
black = ground
white = s = signal RPM
I even tried connecting white to the 12volt supply and removing it then connecting it ....etc nothing moved still?
When I plugged it back into the computers mobo and started the mobo/computer it spun like normally.
WTF ???
The fan
model is 0925-12HBTA DC 12volt 0.60 A Brushless DC FAN by JMC DATECH
Question 2
I have another cpu fan that is the same as that one but with 0.80 A.
So I thought I could substitute the 0.6 A fan for the 0.80 A fan on the mobo. Both have the same connector and fit fine on the mobo and both use 12 volt dc.
Didn't think the 0.20 Amps would make a big difference or at least I would see some spin or something. To much my suprise I saw nothing got to bios "post" beeps and a screen saying the cpu fan could not be detected.
So are mobo so current specific if so are their any standards on what a mobo current must be. I just find it hard to believe that 0.2 amps makes that much of a difference thought I would see something spin at some rate ?
Is their any fan standard for what a fan can have for amps or something or what mobo it can be used on? Because you can pickup fans at radioshack/bestbuy ,...etc and most people won't be looking for amps when buying they just buy ?
I do admit these computers/fans where bought in 2000 so maybe they have a standard now anybody know?
This all got me thinking if I ever have to replace a computers fan I have to look at the amps it runs on and know what the mobo amps are. All computers I know run on 12 volt dc but some of them run on more amps then others. So I would assume that fans are mobo specific as well as memory ,...etc never thought about the fan that way.
Guess the small circuitary of the fan amps needs to corrospond to the amps of the mobo.
Anybody that knows more please let me know.
It all sounds pretty sketchy that you have to know the computer mobo amps this is why I think their must be a standard now. Unless they are figuring out the amps of a mobo by the power of the power supply divide by the 12 volts = current
Thanks for any input or clarity
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