Question: A 170 o C maximum temperature digester is used in a paper mill to process wood chips that will eventually become paper. As shown in

A 170^oC maximum temperature digester is used in a paper mill to process wood chips that will eventually become paper. As shown in figure a, three electronic thermometers are placed along its length. Each thermometer outputs 0 V at 0^oC, and the voltage changes 25mB/^oC. We will use the average of the three thermometer voltages to find an aggregate digester temperature. Furthermore, I volt should appear at Vo for every 10oC of average temperature. Design such an averaging circuit using the op-amp configuration shown in figure if the final output voltage must be positive.

Paper mill digester Thermo- meter #3 Thermo- meter #2 Thermo- meter #1

Paper mill digester Thermo- meter #3 Thermo- meter #2 Thermo- meter #1 (a) R1 RB Rf R2 RA ww R3 V2 Vo Vx V3 (b)

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