I am trying to find the differential input voltage(Vd) for the circuit above. Since this circuit is in open loop, Us is going to be either +Vsat or -Vsat.
Rt is a thermistance that varies with temperature
Rh is a variable resistor.
I am supposing that R,R,Rt,Rh are in series.
In this case,
The inverting input(V-) would be
V- = 15 * Rh/(2R+Rh+Rt).
The non-inverting input(V-) would be
V+ = 15 * R/(2R+Rh+Rt)
Thus, Vd = (V+) - (V-) = 15*(R - Rh)/(2R+Rh+Rt).
I am not exactly sure if I am doing this right... I am having difficult time with analyzing circuits... Could you help me?