Σας περισευει καποιο παλιο τροφοδοτικο; Καντε το fan controller!

To start with I was first thinking about using a linear type of power converting; with the LM338 you have a powerful linear regulator which can regulate 12V down to 7V without a problem. It wouldn't be too hard to build since these regulators demand very little extra components, and since[PRBREAK][/PRBREAK] the circuit is so small in size it would require less time and research for me to get the extreme fan controller done. Downside there is that when using a huge bunch of fans at 7V would set a large voltage drop over the regulator and thus forcing it to heat up quite a lot. Large current drawn will most likely force me to use 3 maybe 4 of those regulators in parallel and thus making the total circuit not only large but also harder to cool down. Plus, more heatsinks and more components to buy so the costs would increase too.

Read more: http://www.madshrimps.be/articles/article/1000077/Building-a-300W-Fan-Controller-from-an-ATX-PSU/0#ixzz1LwZD4r2J