Lab Report Day Twenty-one - Inverting Voltage Amplifier, Op-Amp Relaxation Oscillator

Inverting Voltage Amplifier

In the first lab of the lab, we build an inverting voltage amplifier using an op-amp.  We first calculate the theoretical voltage gain and the phase shift.

We first derive the formula we are going to use. 

We use 2 10K ohm resistors, 1 1 uF Capacitor, and 1 Op Amp to build our circuit. 

Input and output voltage at 100 Hz. 

Input and output voltage at 1k Hz. 

Input and output voltage at 5k Hz. 

This is our result table including the theoretical value and experimental value of gain and phase different at f=100 Hz, 1K Hz, and 5k Hz. 

This is a brief summary table.

 Op-Amp Relaxation Oscillator:

In this lab, we first construct a relaxation oscillator on EveryCircuit.

We are going to generate a frequency of 99 Hz. We calculate the theoretical value for the pot to make this work to be 8371 ohm.

 The circuit consists of 1 10K resistor, 1 100 ohm resistor, 1 10k POT, 1 OP 27, and 1 0.1 uF capacitor.

This is the out put of the circuit. The frequency is 99.8 Hz. It has a percent difference less than 1%. We do this lab successfully.

Summary:

Today we go over how OP Amps work in AC circuit, and do labs to see how to see how they can apply in real life. We learn how op amp relaxation oscillator works and how we can make our desired frequency.