In Figure 1, Ra = 10kOhm, Rb = 40kOhm, and Vin = 0.1V. Find Vout. In Figure 1, R

Question

In Figure 1, Ra = 10kOhm, Rb = 40kOhm, and Vin = 0.1V. Find Vout. In Figure 1, Ra = 100kOhm, Rb = 200kOhm, and Vin = -2.5V. Find Vout. In Figure 2, Rx =49kOhm, Ry = 1kOhm, and Vin = -0.05. Find Vout. The voltage source Vin, in Figure 2 is replaced with a sensor that produces a voltage that varies from 0V to 0.04V. When the sensor voltage is 0.04V, the op-amp output voltage should equal 5.0V. Choose Rx and Ry such that the amplifier has the appropriate gain. The resistor values must be between 1kOhm and 1MegOhm and must be chosen from the standard 1% resistor values shown in the following table:

Explanation / Answer

1) Vin / Ra = I = -Vo/Rb => Vo = -Rb*vin/Ra = -0.1*40/10 = -0.4 2) Vo = -(-2.5) * 200/100 = 5 V 3) I = (0-Vin)/Ry = (vin - Vo)/Rx => Vo = Vi (1+ Rx/Ry) => V0 = -0.05(1+49/1) = -2.5 V 4) given Vi = 0.04 Vo = 5 => 5 = 0.04 (1+Rx/Ry) => Rx/Ry = 124 since the table is not given I am assuming Ry = 5K and Rx = 620 K

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