Operational Amplifiers I

Objective:
-Understand the use of operational amplifiers
-Using our understanding of operational amplifiers to design a circuit with certain specifications

Specifications or assumptions:

-Sensor with an output ranging from 0-1V

-Signal conditioning circuit must have an output range between 0 to -10V

-No more than 1mA current from the sensor

-Op Amp power supplies should supply no more than 30mW

Procedure:

1. Visualize this circuit and do the following predictions 

Since our Rf has to be 10 times larger than Ri so through calculations we found Ri to be 1k ohms and Rf to be 10k ohms.

Then we find the resistances that help us satisfy the requirements previously stated

Since R Thevenin has to be at least a factor of 20 times smaller than the resistant for R1, we will have to change the values since our calculations do not meet this requirement 

Since we have to use resistors that are available in our lab, our resistors numbers have to change

Step 2: Build the circuit using a breadboard 

And the following picture is a closer look at the breadboard

 Step 3: Change the resistance to get different values for your voltage in

Step 4: We find the power delivered and the percent error

Observations:
We had a 85.9% which is not good at all. This means that the operational amplifier is not perfect; Therefore we must not assume that the internal resistance is infinite.