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Automatic CPU Cabinet Cooling System.

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i'm using a OP amp and a thermistor for the temperature sensing.
can you tell me how to improve it more?
 
Looks awfully complex for what it does. Also, I notice the designer doesn't know about hysteresis.

What temperature do you want it to come on at? The surplus stores like Allelectronics usually have a "make-on-rise" button thermostat for a buck or two...
 
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