[Guide] Convert 3 Pin fan to PWM (56k Warning)(Courtesy of Lazzer408) - Overclock.net - An Overclocking Community

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[Guide] Convert 3 Pin fan to PWM (56k Warning)(Courtesy of Lazzer408)

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post #1 of 45 (permalink) Old 08-02-2014, 04:29 AM - Thread Starter
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Courtesy of Lazzer408 from Techpowerup!!

http://www.techpowerup.com/forums/threads/so-you-want-pwm-control-of-your-3-pin-fan.115752/page-3#post-3143383


I personally don't want to spend 20 USD on fans that include PWM and are minutely quieter. So, I just went with Koolance fans. 9 Bucks, can't beat that. I bought 10 of them. http://koolance.com/fan-120x25mm-108cfm

For this project you will need soldering iron, flux, and solder, solder wick and decent soldering skills. I recommend helping-hands and a vice, and a magnifying glass with LED lighting. (But that's overkill)


This guide will show you the simplest way to PWM control up to 10 fans safely, (or about 3 amps). 11 amps on 18 gauge wire is the recommended maximum for molex connectors. Proceed at your own risk. (Looking at you Delta Fan owners and lovers) tongue.gif:p:p:p:p

Here are some references before we get started:

Pin Outs and Power






Schematic




Parts List and Links to Purchase

5.1v Zener Diode: http://www.mouser.com/ProductDetail/Vishay-Semiconductors/TZX5V1A-TR/?qs=sGAEpiMZZMtQ8nqTKtFS%2fC7KvLOwmmQCtCYT1%2fs1PtE%3d
10k Ohm Resistor: http://www.mouser.com/ProductDetail/Vishay-BC-Components/PR01000101002JA100/?qs=sGAEpiMZZMsPqMdJzcrNwiCREInfUjhCku0gD%2fN6gQU%3d
N Type MOSFET: https://www.radioshack.com/product/index.jsp?productId=13339909 (Best, I'd recommend a heat sink....
TO-220 heatsink for nte2985: http://www.mouser.com/ProductDetail/Wakefield/274-1AB/?qs=sGAEpiMZZMttgyDkZ5Wiuita4PD18Ap7e0ZyfdsUPiE%3d
Solder Board: http://www.amazon.com/gp/product/B0073XD90K/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
4 Pin Fan: http://www.moddiy.com/products/4%252dPin-Male-Fan-Connector-%252d-Black.html
3 Pin Fan: http://www.moddiy.com/products/3%252dPin-Male-Fan-Connector-%252d-Black.html
Molex Female: http://www.moddiy.com/products/4%252dPin-Molex-Female-Header-Socket-Connector-for-PCB-Mounting.html


When making your runs, please use 22-24 gauge wire. Solder runs are fine, but may not hold up to the amperage. Solder joints also tend to crack very easily.


So, the first thing I did was space out my components and connectors in a nice, semi-tight area. If this is your first time ever using a soldering iron, I would use the full board to get used to routing wire and give yourself some room to play. Components are cheap, buy a few of them.

The schematic is as simple as it gets. Be sure to route gate between the zener and resistor. This is for PWM.














So, all completed. If PWM IS NOT CONNECTED YOU SHOULD RUN AT FULL SPEED. (12v)


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post #2 of 45 (permalink) Old 08-02-2014, 07:50 AM
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This is exactlly what I was searching (want to plug two 3pin Fans(CPU-Heatsink) into my one PWM-CPU-Header.
But I never did something like that and I'm still at school. Could you explain a little bit more precise how to exactlly do it (and how to do it for 2Fans)?
Would be really AWESOME!!!!!
DrBlock42

PS: Thank you a lot for posting awesome stuff like that.
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post #3 of 45 (permalink) Old 08-02-2014, 02:04 PM - Thread Starter
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No problem, for two fans just parallel two headers instead of the ten I have. Or use one header, and a fan splitter cable. With something like that you could make the circuit very very small, and may not even require perfboard. This design is capable of driving from a single fan to multiple fans.
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post #4 of 45 (permalink) Old 08-02-2014, 02:07 PM - Thread Starter
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The reason I'm using a molex proprietary connection for power is because the amp draw allowed from the motherboard header is only about peak 2 amps. You don't want any stress on your motherboard fan headers.
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post #5 of 45 (permalink) Old 08-02-2014, 03:55 PM
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So my one header ( on the asus p8 z77-v lx2 ) can power two corsair sp120 q.e. fans?
And does it controll the speed smoothly(so exactlly like the mainpoard pwm output)? (not like:its on 30% and if itbgets to hot it jumps to 100%
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post #6 of 45 (permalink) Old 08-02-2014, 03:59 PM
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Design this as a product (good looking, small and scalable) and get it on Kickstarter!

I will be backing this!

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eVGA GTX 1080 Ti
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2x8 GB Dominator Platinum 3733MHz CL17
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Samsung 960 EVO 1TB
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Silent custom liquid cooling
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post #7 of 45 (permalink) Old 08-02-2014, 04:17 PM
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post #8 of 45 (permalink) Old 08-02-2014, 04:46 PM - Thread Starter
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Quote:
Originally Posted by DrBlock42 View Post

So my one header ( on the asus p8 z77-v lx2 ) can power two corsair sp120 q.e. fans?
And does it controll the speed smoothly(so exactlly like the mainpoard pwm output)? (not like:its on 30% and if itbgets to hot it jumps to 100%

You can control and power two SP120 fans directly from the motherboard. Also, I forgot to mention that the fans will run at a minimum 50%, and slowly ramp up to 100% depending on temperature.
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post #9 of 45 (permalink) Old 08-02-2014, 04:49 PM
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is it possible to let them ramp up fromm 20% or 30%?
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post #10 of 45 (permalink) Old 08-02-2014, 05:16 PM
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What's this fascination that lotsa people have with Corsair SP120 QE fans? ..... as if they have some magical properties.

For starters, they are bad fans for HeatSinks and radiators.. no matter how much hype is sold
And there is some issue with the PWM SP120s that make them misbehave as soon as you have 4 or more of them on the PWM channel


But aside that... Kudos to lazzer408

Reality is futile, you will be assimilated by (your) perception.

Golden Rule(s) for Fans: CHEAP + SILENT = NO PERFORMANCE ▼ CHEAP + PERFORMANCE = NOT SILENT ▼ SILENT + PERFORMANCE = NOT CHEAP
+Most SILENT Case Fans are not well suited for CPU-HS-Towers or Radiators
+Most SILENT Case Fans are not well suited for cases, especially if they have filters. (added by doyll on 23/04/2014)
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