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electronics Answered

can some help me to give a circuit diagram in heat sensor cooling fan using only thermistor, potentiomet and resistor. 



So if I understand you correctly, you want to make a cooling fan that would start using a circuit made from just the three components? Well, you need some kind of a microcontroller (Arduino) to do such a thing, without it and with any kind of IC or a Mosfet at minimum doing that would be difficult. Also if you are working on a fan that's connected to 120volts or higher you would need a relay. If you are interested I can provide you with a circuit diagram.

You don't need a diagram for three parts ;)

So what is your problem? Can you be a bit more specific please?