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Media Cabinet cooling circuit help

philipsbe

Aug 9, 2011
1
Joined
Aug 9, 2011
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I am a newbie here and last time I did something with a circuit was in grad school. I am trying to build a simple circuit and can use your help.

Problem: Controling voltage so that the current is passed when certain threhold (for voltage) is reached.

I am using AerolCool Touch 1000, a fan controller which controls speed of a PC fan. The issue is that the fan is always on, it is either running at slow speed (RPM) or high speed when the temperature is hot.
I need to introduce some thing in the circuit (between fan controller and 12 V fan) so that the fan comes on when certain limit (read temperature) is reached .

I believe that the aerocool is simply controlling voltage and keeps on increasing or decreasing the voltage beased on temperature.

Any help is appreciated.
 
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