Before we start the lab, we read the lab, so that we knew the op-amp that is actually consist of a lot of resistors, transistors and capacitors. According to the material, we could calculate the set up first. We got Ri(theoretical)=1K, and Rf(theoretical) for 10K. In addition, we used both power supply for 6V. The Rx just equal to V^2/P=288, Is=V/Rx=.02A. The maximum setting for Ry which is just 1/0.02A=50ohms, but the actual we had is 51ohms. In order to know the Vth, we did figure out the current first, which is 6/288=0.1717A, so by using the KCl, -6+288*I=-Vth, so the Vth=2.9V. After all the calculations, we set up out circuit by using Ri=988ohms, Rf=9.87kohms, Rx=297 ohms, a the vary resistor,and V1=12.12V, V2=12.13V.
As the image set up, we measured out group of data the Vout=0.019V,-2.5,-5.07,-7.55,-9.94, so the gain that we had which are all around 10. Then we measured Vri=0.003V,0.25V,0.5V,0.75V,0.99V,so we could calculate the Iri=0.003mA, 0.253mA, 0.506mA, 0.759mA, 1.002mA. Also the Vrf that we got are 0.019V, 2.53V, 5.09V, 7.6V, 9.97V.
For the last part that we did in the lab was measuring the Iv 1 and Iv 2, that we got 0.6mA, and 0.99mA, and we thought out data was good. For calculating the power for each one just P1=V1*I1=12.12*0.6mA=7.272mW and P2=V2I2=12.13*0.99mA=12.0087mW.
After doing this lab, i feel more interesting because we actually did some stuff which change something. I am looking forward the second op-amp lab.
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