Archive for May, 2009

Quick Update

Posted in Personal on 30/05/2009 by Undersys

New posts will come soon!.

I’ve been living at work for the last 8 weeks.

I am also building a new PC. You can see the images here .
Fully H20 cooled and some case modding.


Cisco 3500 Fan Mod

Posted in HowTo on 03/05/2009 by Undersys

The new switch is coming along quite nice. Apart from the fact its to noisy!
The cisco switch has some wacko blower fan, it works quite fine at 5v and pushes quite a large amount of air at this speed.

I made a simple fan speed reduction circuit using an 7805 to reduce the fan speed from 12v to 5v.
I did try look for a 7v or 5v feed from the cisco PCB , but could not find one.
I won’t bother with a circuit diagram as there is nothing but one 7805, a plug and a heat sink!

Its just stuck to the case with tape, cheep easy and effective :)

5v Fan Mod Cisco

Much quiter now :)