Hello

İm tring first circiut. But i need implement this circuit with lm35 (temperature sensor ) . How i can do it ? if i use just potantiometre instead lm35 , can this ciruit can start ?

 

What is R3 feeding, the only way a Lm35 can alter the timing is on pin 5, by altering the reference voltage.

 

I've got a diagram for a 555 thermostat circuit if that's what you're making. It uses a TIP 32 transistor to switch a fan on at 42°c