Just on the off-chance someone may have done this before.

My Comms cabinet get quite warm in summer, mainly from PSU and the ADSL
modem & Ethernet switch.

Maybe if I use a 3 lead variable speed DC brushless fan (as in PC cases)
and a tenp sensor I could get a simple fan that kicks in above a set
temp and varies it's speed dependent of how hot it is above threshold.

Seen one such cct:

http://www.bit-tech.net/modding/2001...n_controller/1

(option 3 )


Anybody got anything easier.




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UK SelfBuild: http://uk.groups.yahoo.com/group/UK_Selfbuild/