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Will this work? Simple fan controller mod - Page 3

post #21 of 40
daisy chain implies a series connection ? but you'd want a parallel connection ?
post #22 of 40
Thread Starter 
all the molex wires are are daisy chained together like in the picture. This way i can draw power from the same molex
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post #23 of 40
i think you should make a new picture / diagram
post #24 of 40
Thread Starter 
Here is the revised version. Is this what you are talking about?


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post #25 of 40
So are you trying to achieve OFF/7v/12v? Because i was going to say that not all fans will even spin at 5v. I have had both large and small fans stop spinning @5v.

Sorry if I am barging in on your thread, I just noticed that nobody here seemed to state that fact.
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post #26 of 40
Thread Starter 
12V/5V, no off since its pointless to have fans off. My Scythe S-Flex will be able to run at 5V after they started at about 7V. 7V is dangerous without a resistor and using direct cable swap since it uses the 5V rail as the ground to achieve the 7V differential and feeds power directly back to the 5V rail on the PSU.
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post #27 of 40
Quote:
Originally Posted by OC'ing Noob View Post
Here is the revised version. Is this what you are talking about?

thats right if i presume they is 4 switches for 4 fans
Edited by Ultrasonic2 (muffy) - 12/20/08 at 1:38pm
post #28 of 40
Quote:
Originally Posted by OC'ing Noob View Post
12V/5V, 7V is dangerous without a resistor and using direct cable swap since it uses the 5V rail as the ground to achieve the 7V differential and feeds power directly back to the 5V rail on the PSU.
um 7volts using the +5 and +12 is fine the fan is the resister. There is no back feeding in theory
post #29 of 40
Thread Starter 
Quote:
Originally Posted by Ultrasonic2 (muffy) View Post
um 7volts using the +5 and +12 is fine the fan is the resister. There is no back feeding in theory
It usually only affects the PSU when there are no devices pulling from the 5V rail. Most PSU protects against this somewhat by shutting off (I have had that happen to me 4 times with this rugged Antec 350W PSU ) and will start again once I change it to a 12V.
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post #30 of 40
have done it with a SPDT switch for 12v-off-5v, haven't found a fan that wouldn't work at 5v...

but wanted a bit more control so moved away from a toggle and started using a real fan controller...


http://www.criticalvelocity.com/item.php?itemid=spdc06

15 AMP capacity... PWM and works from 5.5v to 36v... and can be controlled with pot, 0-5v, push button or clock... even has soft start... they have a few models with different features.
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