@▷ Automatic Fan Controller Circuit | Diagram for Schematic

Automatic Fan Controller Circuit

Automatic Fan Controller Circuit



 

Automatic Fan Controller Circuit

 


This circuit will turn on/off 12V DC fan or CPU fan when temperature above normal temperature.You can set turn on temperature by adjust VR1. This circuit use an NTC (Negative temperature coefficient)which is a thermistor is one in which the zero-power resistance decreases with an increase in temperature. So If temperature increase the voltage at pin 3 on LM311 will decreased .The resistance of NTC is about 10K at 25'c.


VR1 should be multi-turn potentiometer type such 10K/25 turn


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