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MOSFET Swap for Fan Controller

post #1 of 2
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I have a Bitfenix Recon fan controller, and was a little upset to note that the controller only supports 10w per channel. This is a pain, especially since my build has 5 zigmatek fans for just the radiators alone. What I do know is that all the controller does when it comes to the fan is control its speed via PWM. I want to modify one of the channels on this fan controller so that it can power all 5 fans from one channel, leaving the other 4 channels for other cooling zones.

So far, I am thinking of two possible methods of doing so. The first is to get a mosfet that matches the stock one, just with a higher current rating, and use the same logic line from the stock transistor to switch the gate of the more powerful one, and bypassing the rest of the circuitry all together by using power/ground lines from the power supply. The other possible solution would be to use a mosfet with a 12 gate, and connect the gate output directly to the output from the fan controller, instead of the fan itself. This should allow for the mosfet to get the same switching commands from the controller, but allows me to pump in more power.

Has anybody done this before? Any tips?
M8
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M8
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Intel Core i7-875k Asus Maximus Gene III Sapphire ATI Radeon HD 5870 EyeFinity 6 Sapphire ATI Radeon HD 5870 EyeFinity 6 
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12 GB DDR3 Toshiba Q Series HDTS225XZSTA SSD Seagate Barracuda STBD2000101 Sony BWU-200S bluray burner 
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post #2 of 2
What's a 12 gate?

I'd look up the ratings for the MOSFET that it shipped with, first, and see what current it is rated for. I'd be willing to bet its far more than 10W, and that the limiting factor is the controller heatsink. If that's the case, just install a larger heatsink. There's almost 0 chance that you'll cook the PCB traces.
Tractorbox II
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Tractorbox II
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al dente
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Intel 4770k Gigabyte Z87-DS3H Nvidia Geforce 970 G.Skill DDR3-10700 
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AMD Athlon 2 X2 240 ASRock 760GM-GS3 Kingston HyperX Blu Red Series 250Gig Seagate 
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Stock FX-6100 cooler Windows XP Wells Gardner 25K7194 
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