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DIY Bing's PWM Fan Controller

post #1 of 43
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Edited by Martinm210 - 12/8/12 at 6:30pm
    
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post #2 of 43
Hey Martin, congratulation !

Hope this will contribute to your awesome fans review ! Thanks !

Quote:
Originally Posted by Martinm210 View Post
I drilled and mounted the pot on the one end and JBwelded the molex on the other. I also borrowed the 4pin fan header from an old motherboard. Works good other than it currently increases turning to the left, but I think I can fix that easy enough.
Easy, just swap that 2 outer legs connections at the pot, thats it.
post #3 of 43
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Quote:
Originally Posted by Bing View Post
Hey Martin, congratulation !

Hope this will contribute to your awesome fans review ! Thanks !



Easy, just swap that 2 outer legs connections at the pot, thats it.
Awesome, thanks for the circuit...I'll swap those outer legs.

Curious to do some sound comparisons between voltage controlled and PWM.

It was alot of fun. I may go ahead and try building your 0-100% version too.
    
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post #4 of 43
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Just swapped the two outer pot leads and it's now counterclockwise is increasing Perfect!
    
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post #5 of 43
Nice circuit . Too bad it only does 4 wire fans though.

They should really look into making a simple rpm readout. It would make it so much cooler.
    
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post #6 of 43
Quote:
Originally Posted by Martinm210 View Post
It was alot of fun. I may go ahead and try building your 0-100% version too.
Most of the times, I'd say 99.9% of the cases you only need this 2-98% duty cycle range, majority PWM fans out there will have a flat response and hit at their slowest speed approx. at 10% duty cycle.

For example like the Swiffnets 35X model pump below, at the chart the minimal speed can be reached at approx 12% duty cycle and the max rpm is at 70%, so that controller's range at 2-98% is more than enough.

Click to enlarge
Attachment 211682
Courtesy Swiffnets

Unless you're using a very2 rare breed of fan which is capable of 0 rpm "fully stopped" at 0% and reaching almost it's full speed at > 92%, this kinda fan is found on exotic high end 1st tier fan maker like from Sanyo Denki, Nidec or Delta, these wide range duty cycle range is designed to give a very fine tuning capabilties at the process to skip thru various oscillating/resonance zones with the purpose to improve noise/cooling ratio thru out the speed range. Also at other weird custom fan that will kick start to it's max speed when set to perfect 0% duty cycle, yeah, these are no ordinary fan and they're so rare that is so difficult to find it at ordinary fan markets.


.

LL
Edited by Bing - 5/21/11 at 11:07am
post #7 of 43
DYI? Do Your self It?
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post #8 of 43
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Quote:
Originally Posted by cdoublejj View Post
DYI? Do Your self It?
Soldering fumes...
    
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post #9 of 43
I'm definitely going to have to try this out, looks like fun .
Thank's for sharing this Martinm210!
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post #10 of 43
This is sweet. You think you could build something that handles more than 30 Watts so I could put all 6 of my push pull fans on a single dial? hmmm... Not as good at circuits as I am at other things.
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