# Operational Amplifier (Op-Amp) Tester

This calculator will allow you to experiment with operational amplifiers to see how they work. Below is a drawing of how this virtual calculator is set up. This workbench consists of three pieces:

• The Input Function Generator, also known as the Wave Generator, is a device which provides a voltage wave for use as an input to our op amp circuit. This generator is capable of producing multiple waveforms, which you can select from the input function dropdown. This wave generator is connected directly to the $V_{\text{in}}$ of the operational amplifier. It is also connected to the oscilloscope so that you can see the input voltage to the circuit. On the oscilloscope, this is represented in blue (channel 1).
• The Operational Amplifier circuit is our circuit design for testing. This setup will allow you to play with operational amplifier configurations for boosting, inverting, or otherwise changing your signal. Making changes to the resistor values and type of operational amplifier will modify the input voltage (from the wave generator). This modified voltage wave, known as $V_{\text{out}}$, can be seen on the oscilloscope in yellow (channel 2). Changing the paramters of the operational amplifier circuit will change this $V_{\text{out}}$ wave, which will be seen on the oscilloscope.
• The Oscilloscope, is attached to both $V_{\text{in}}$ and $V_{\text{out}}$ of the operational amplifier circuit for the purpose of looking at how the op amp changes voltage. The blue wave (channel 1) on the oscilloscope shows you what is coming into the op amp circuit, and the yellow wave (channel 2) shows you what is coming out of the op amp circuit. This should give you an idea about how to configure an op amp circuit to get the necessary gains/alterations that you need. The oscilloscope has additional settings which can be configured to allow you to better see the voltage waves. Note that if your wave cannot be seen easily on the screen, adjusting the voltage per division to be a larger number should give you a larger viewing area.
Calculator Settings
Input Function Generator
These settings control the voltage input ($V_{\text{in}}$) to the operational amplifier circuit.
Operational Amplifier Circuit
Adjust settings in the op amp circuit.

The values of $R_1$ and $R_2$ will determine the gain of the op amp (shown in the circuit).

Oscilloscope
Cursors
Channel 1 (Input)
Settings for the Channel 1 voltage, which is attached to the $V_{\text{in}}$ wave from the waveform generator. This waveform is blue on the scope.
Channel 2 (Output)
Settings for the Channel 2 voltage, which is attached to the $V_{\text{out}}$ wave from the op amp circuit. This waveform is yellow on the scope.