I want to use a sensor that delivers a DC voltage that varies from 0.174V to 1.174V depending on the temperature.
After processing the signal, I want to have a voltage between 1 and 9V (when Vin = 0.174, Vout = 9V and Vin = 1.174, Vout = 1V.)
Here is a circuit diagram that was given to me by an electronic engineer but I don't know how dimensionate component :
Here is my calculate :
In linear mod, E+ = E- because Espilon = 0. More over, I, in born "+" is equal to 0 so :
E+ = 5V
From milman :
E- = (UeR3+UsR4)/(R3+R4).
So 5 =(UeR3+UsR4)/(R3+R4) <=> 5(R3+R4) = UeR3+UsR4 <=> 5(R3+R4) - UeR3 = R4Us (5(R3+R4) - UeR3)/R4 = Us
I put my system from my point : Ue = 0.174V Us = 9V; Ue = 1.174V Us = 1V And here is my system :
9 = (5R3 + 5R4 - 0.174R3)/ R4 R4 = (4.872/4)R3 <=> 1 = (5R3 + 5R4 - 1.174R3)/ R4 1 = 3.872R3+(5(4.872/4)*R3)/4.872/4)*R3
So 1 = 9.962R3 / 1.218R3 <=> 1 = 9.962/1.218 so that's not good.
Somebody can help me to solve this please ?