how to make fan controller?

how to make a fan controller?: 

how to make fan controller circuit diagram. here used PTC C831 to control the room temperature.  this PTC works as a resistor. PTC resistor depends on temperature. this PTC is used in this automatic fan controller. 

Negative Temperature Coefficient (NTC) thermistors have less resistance at higher temperatures. sometimes we need to control our fan switch according to our temperature. for this we can use this circuit as an automatic switch for the rooms.

 

 

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Build a Transformer or construct the transformer. Home Theater Circuit Diagram 5.1

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