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Old 01-26-2012, 05:57 AM   #11
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Quote:
Originally Posted by tmd49 View Post
This is my problem; the pot is either off or on, no variable resistance. Should I get a bigger/stronger pot? I hae a 6v DC power supply with a 12v fan.
Try an LM317 or check out flomasters post below.

Originally Posted by Flomaster
so after reading the other 200 page DIY thread about using an old computer fan, hard drive magnets, radio shack potentiometer and a random power supply I attempted to build my own. after many a failed attempts and finally getting a working combination using a 18V JBL power supply I found it was spinning to fast for my liking even on the slowest setting.

I saw another thread about this usb fan on amazon.com and said WTF might as well try it out. well let me tell you this works fantastic and is super easy to put together.

http://youtu.be/f9Oij-NCWds

Video Link:

here is a link Video Link: http://www.amazon.com/Thermaltake-Mo.../dp/B00080G0BK to my fan its an 80mm fan I didn't think I needed to spend the extra coin on the 120mm fan.

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Old 01-26-2012, 10:04 AM   #12
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That's the trick, figuring which you need for your specific fan. I don't know the answer. Sorry.

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Old 01-26-2012, 11:01 AM   #13
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check here, it has all the info needed http://www.stirstarters.com/

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Old 01-26-2012, 03:20 PM   #14
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Quote:
Originally Posted by pompeiisneaks View Post
Um, those are for 120v no? Completely wrong kind. Not 12 or 24v.
No, if you put 120v into a LM317 your going to fry it. The LM317 voltage regulator will take any input voltage up to about a max of 38v and allow you to use a potentimeter to reduce the output. The output is capped to about 1v under your input voltage so with the right potentimeter your 24v supply could give you a output of 1(?)-23v to the fan. Odds are the stall speed of the fan will be your actual lowest threshold and be somewhere above the lowest threshold of the LM317.

info and a calculator:
http://www.electronics-lab.com/articles/LM317/
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