April 25, 2011. Op Amp I

The purpose of this lab is to practice using of Op Amp in a circuit and understand how it works. First, we receive a 741 Op Amp from the instructor. The Op Amp looks like the black little box in picture 2. Then we designed a circuit that the input voltage would be 0-1V range. and output is 10 times the input. We built a voltage divider to make the input voltage to 1V maxium. Then we connect the 1 power source to positive power supply, and another to negative power supply. Then we put resistors in the order of our design. After that, we ran out circuit, and measured the voltage of input, output, current and so on. Here is the value:

Ri	2.95k ohm		Vin	1 V
Rf	31k ohm		Vout	10.58 V
Rx	1288 ohm		Gain	10
Ry	148 ohm		Vri	0.78 V
V1	12.16 V		Iri	0.26 mA
V2	12.15 V		VRf	8.49 V