Prelab:
We start with the LM35 which produces 10 mV/°C.
We want to measure between 15 °C to 35 °C.
Using a difference amplifier, we shift and amplify the range of 150 mV - 350 mV to 0V - 5V.
To do so, we have V_2 = LM35, V_1 = 150 mV.
Our gain is 25, so R_f = 150 kΩ, and R_i = 6 kΩ.
Procedure:
We start by building the circuit.
V_1 = Left pot, V_2 = Right pot |
We then measure V_out = 5.05 V
Conclusion:
The lab was a success. We were able to use our opamp to amplify 350 mV correctly into 5V.
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