Thermostat LM56 Project Circuit Diagram
Thermostat LM56 Project Circuit DiagramLM56 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 andVT1 or T2 = [6.20 mV/degree Celsius x T] = 395 mV therefore:R1 = VT1/ (1.25V) x 27 k OhmsR2 =
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