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
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