Hi Guys,
I have built Circuit 1 as in the schematic below and which works extremely well.
It switches on a fan when the temperature at the thermistor (TH1) reaches about 35°C.
But I wish to augment Circuit 1 and have enhanced the circuit to create Circuit 2 as below.
I want the circuit to detect 2 levels of temperature which switches on FAN1 when the temperature at the thermistor (TH1) is about 40°C and then FAN2 at about 45°C.
I have at this stage only approximated the resistor values at R1,R2,R3 and R4 but I may have to do a little juggling with the values to set the temperatures I want.
But, as far as you can see, will this work and is this the correct way of doing it?
Can you think of any other (easier) way or any alterations that it might need?
Thanks
I have built Circuit 1 as in the schematic below and which works extremely well.
It switches on a fan when the temperature at the thermistor (TH1) reaches about 35°C.
But I wish to augment Circuit 1 and have enhanced the circuit to create Circuit 2 as below.
I want the circuit to detect 2 levels of temperature which switches on FAN1 when the temperature at the thermistor (TH1) is about 40°C and then FAN2 at about 45°C.
I have at this stage only approximated the resistor values at R1,R2,R3 and R4 but I may have to do a little juggling with the values to set the temperatures I want.
But, as far as you can see, will this work and is this the correct way of doing it?
Can you think of any other (easier) way or any alterations that it might need?
Thanks