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Idea for an handmade fan controller

post #1 of 18
Thread Starter 
Hey guys
I'd like to put a fan controller in my Bitfenix Pandora.
It hasn't any 5.25' bay so I have to create something ad hoc.

The idea is to put 4 knoobs in the rear part of the case. Time the fans. Leave it as it is.

Together with the controller I'd like to put a display for each fan to read the volts I send to the single fan.

The first thing I was asking me is: how much watt can I drive for each channel?

I would use sp120 high performance and af120 high perfromance

Thanks everybody
post #2 of 18
If you just want to set it to a certain voltage and forget it, and your motherboard doesn't offer that capability, you could still just buy a fan controller and leave it inside the case. If you're "setting it and forgetting it," then after you've set it you can just leave it as is. You don't have to buy one in 5.25" form factor. Look up "fan hubs."

How many watts each channel can provide depends on the controller. If you're asking how much power your motherboard headers can provide, that also depends on the motherboard, but it's usually 12W.

If you need more power than the controller or your motherboard can provide, then get a powered fan hub and power it directly from your power supply.
post #3 of 18
Thread Starter 
Quote:
Originally Posted by gftgy View Post

If you just want to set it to a certain voltage and forget it, and your motherboard doesn't offer that capability, you could still just buy a fan controller and leave it inside the case. If you're "setting it and forgetting it," then after you've set it you can just leave it as is. You don't have to buy one in 5.25" form factor. Look up "fan hubs."

How many watts each channel can provide depends on the controller. If you're asking how much power your motherboard headers can provide, that also depends on the motherboard, but it's usually 12W.

If you need more power than the controller or your motherboard can provide, then get a powered fan hub and power it directly from your power supply.
the fan hub could be a good idea.

I've never heard about them but it sounds for my case.

About the power I was talking about the power which can erogate an handmade fan controller...

Anyway my need is only to impose a voltage and then forget it...

My purpose of making it myself is only because I thought it could be better choose a pot and other components...

Today I've bought the pot and some meters of red/black cable. Stupid action?
post #4 of 18
ive made my own fan controller. not sure I did it the best way, but it worked.

The controller uses a LM317T adjustable voltage regulator I probably could find my schematic if you want it.
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post #5 of 18
Thread Starter 
Quote:
Originally Posted by PhillyB View Post

ive made my own fan controller. not sure I did it the best way, but it worked.

The controller uses a LM317T adjustable voltage regulator I probably could find my schematic if you want it.
oh yes man!
If I could have a look it could be beautiful.

My idea was
Psu.Pot.wire.fan.wire back to PSU.

Too simple?
post #6 of 18
Quote:
Originally Posted by donaldduck2004 View Post

Hey guys
I'd like to put a fan controller in my Bitfenix Pandora.
It hasn't any 5.25' bay so I have to create something ad hoc.

The idea is to put 4 knoobs in the rear part of the case. Time the fans. Leave it as it is.

Together with the controller I'd like to put a display for each fan to read the volts I send to the single fan.

The first thing I was asking me is: how much watt can I drive for each channel?

I would use sp120 high performance and af120 high perfromance

Thanks everybody
Sorry, but I have to question the logic of fixed speed case fans..
Your GPU and CPU cooler fans are temperature controlled to speed up and move more air as needed to keep them cool. For me the logical thing to do is have case fans doing the same .. so they supply the needed airflow to CPU and GPU fans as needed. This give us a system that can both stay cool under heavy load and be very quiet when not working hard. How to do it is explained in "Ways to Better Cooling" link in my sig.1st post is index. Click on titles of interest. wink.gif
Edited by doyll - 10/2/15 at 3:31am
post #7 of 18
Quote:
Originally Posted by donaldduck2004 View Post

oh yes man!
If I could have a look it could be beautiful.

My idea was
Psu.Pot.wire.fan.wire back to PSU.

Too simple?

That would work as long as the pot can handle the watts.

I will try and get that schematic tonight when i get home.
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post #8 of 18
Thread Starter 
Quote:
Originally Posted by doyll View Post

Sorry, but I have to question the logic of fixed speed case fans..
Your GPU and CPU cooler fans are temperature controlled to speed up and move more air as needed to keep them cool. For me the logical thing to do is have case fans doing the same .. so they supply the needed airflow to CPU and GPU fans as needed. This give us a system that can both stay cool under heavy load and be very quiet when not working hard. How to do it is explained in "Ways to Better Cooling" link in my sig.1st post is index. Click on titles of interest. wink.gif
I'll check it out asap wink.gif
Thanks!
Quote:
Originally Posted by PhillyB View Post

That would work as long as the pot can handle the watts.

I will try and get that schematic tonight when i get home.
It would be grateful! wink.gif
post #9 of 18
Sorry, forgot to post last night.



The way it this works, the lower the combination of the1000 ohm resistor and 1000 ohm pot, the higher the voltage to the fans. The design will let the voltage get as low as 7 volts. The 317t regulators I bought allow up to 1.5amps, so that can be a few fans per regulator (depends on the fans) At 7 volts and a couple fans, the regulator does get hot. I used a thin thermal pad connected to some scrap aluminum to cool them.

On my controller, I have 6 of these circuits connected to a single molex and 2 fans per regulator.
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Half Wood Giant
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post #10 of 18
Thread Starter 
Quote:
Originally Posted by PhillyB View Post

Sorry, forgot to post last night.



The way it this works, the lower the combination of the1000 ohm resistor and 1000 ohm pot, the higher the voltage to the fans. The design will let the voltage get as low as 7 volts. The 317t regulators I bought allow up to 1.5amps, so that can be a few fans per regulator (depends on the fans) At 7 volts and a couple fans, the regulator does get hot. I used a thin thermal pad connected to some scrap aluminum to cool them.

On my controller, I have 6 of these circuits connected to a single molex and 2 fans per regulator.
thank you very much for the reply!!!wink.gif

I've already bought the 1kohm pot.

some questions:
how could I reduce the heat generated?
why do you put the 120ohm resistance there?
why is there the 317t? I was expecting the only pot could do the job...

sorry for the noob questions but I'm here to learn something. not copy and then stupidly apply it.

I hope you will understand my curiosity.

is this could be helpful?
https://www.youtube.com/watch?v=IjJWWGPjc-w
donald
Edited by donaldduck2004 - 10/5/15 at 8:37am
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