LM56 Thermostat Project Circuit Diagram

LM56 Thermostat Project Circuit Diagram values of R1, R2 and R3 for the required trip points VT1 and VT2 can be determined using the subsequent equations. VT1 = 1.250V x (R1)/ (R1 + R2 + R3) VT2 = 1.250V x (R1 + R2)/ (R1 + R2 + R3) where: (R1 + R2 + R3) = 27 k Ohms and VT1 or T2 = [6.20 mV/degree Celsius x T] = 395 mV therefore: R1 = VT1/ (1.25V) x 27 k Ohms R2 = (VT2/ (1.25V) x 27 k Ohms) – R1