Operational Amplifiers 1

Introduction:
The purpose of this lab is to condition a signal from a voltage input to a required voltage output.
- Set up voltage divider circuit in order to obtain signal voltage in DC
- Set up Inverting op amp circuit that conditions signal from 0 to 1 v to 0 to -10v
- measure the values
- conclusion

Procedure:
We first had to find the necessary resistors for this circuit by finding an appropriate ratio and looking at the available resistors.
-The sensor may only output a maximum of 1 mA of current.

Vcc = 12 V.
Vee = -12 V. 
Vin = 0 V to +1 V.
Vout = 0 V to -10 V.

Then we created a voltage dividing circuit that would give us the correct 1 V drop across the input and output, which can be modified with the POT.

Ry = 909 Ohm

To make sure the resistor Rx does not surpass the power limit we calculated the minimum possible resistance.

Rx_min=1152 Ohms, but we will use 1300 ohms as We used a 1300 Ohm resistor to be safe.

For Rx at 1300 Ohms we recalculated 
Ry = 118 Ohms












To avoid unappreciable loading of the divider circuit with too low resistances we used a 10k Ohm Rx value instead.

These values are what we used for our model.













By decreasing the value of the POT to a value lower than 909, we were able to obtain necessary voltages for the signal input.

This is what our circuit and testing looked like.

Testing for all the voltages and caluclating the necessary values gave us the following table.

Conclusion:

     The results conclude that there was a gain of -10 through the OP amp, which conditioned the signal to the desired voltage. The current did not exceed 1 milliamp and the voltage divider resistor remained in tact. We were able to successfully condition a signal for the various voltages and see the expected gains.