Operational Amplifiers

The idea behind the op amps lab is to apply operational amplifiers in a real world scenario. There may be many instances in the real world where a circuit may be required to have a different set of voltages at different parts of it. For example, a sensor which captures certain information may not be outputting an ideal voltage for it to work with the attached processing unit. Enter the Op Amp which can make it work! The following circuit was built and all the values were recorded.



Once the circuit was constructed, it was apparent that the circuit contains a feedback loop. By putting a resistor in between the output voltage and the input voltage, the operation amplifier can be made to output the desired voltage gain.

The circuit was then connected to two separate voltage sources providing various voltages starting from 0 and ending in 1. We went in 0.25 volt increments. The following is

Vin	Vout	GAIN	Vri	Iri	Vrf
0	0	0	0	0	0
0.25	-2.39	9.958	0.24	0.235	2.39
0.5	-4.9	9.8	0.5	0.504	4.9
0.75	-7.44	9.92	0.75	0.707	7.43
1	-9.93	9.83	1.01	1	9.93

It came out that the current being drawn from sources were about 7.5 and 1.8 milliamps. These were not expected but that may be in part due to the fact that the power supplies (voltage supplies) were also being used to power the voltage dividers.