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Session 1

This document summarizes a student's electronics experiment using Multisim software to simulate circuits. The objectives were to familiarize students with Multisim and design a non-inverting amplifier. Specific tasks included measuring waveform properties, determining gain and bias conditions of an amplifier circuit. Analysis of cutoff frequency and phase angle were also examined. The student concluded that the first experiment helped familiarize them with Multisim's capabilities and applying it to analyze basic circuits was straightforward.

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106 views8 pages

Session 1

This document summarizes a student's electronics experiment using Multisim software to simulate circuits. The objectives were to familiarize students with Multisim and design a non-inverting amplifier. Specific tasks included measuring waveform properties, determining gain and bias conditions of an amplifier circuit. Analysis of cutoff frequency and phase angle were also examined. The student concluded that the first experiment helped familiarize them with Multisim's capabilities and applying it to analyze basic circuits was straightforward.

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api-3696675
Copyright
© Attribution Non-Commercial (BY-NC)
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De La Salle University

College of Engineering
Electronics and Communication Engineering

Experiment Number : 1
Experiment Title : Session 1

Date Performed : September 19, 2006


Date Submitted : September 26, 2006

Instructor : Ms. Blanca Bucao

Subject / Section : COMPULA / EK1

Submitted by : Santos, Marvin

Presentation :________________
Data and Results :________________
Analysis and Conclusion :________________
Total :________________
Objectives

• To familiarize the student in using Multisim.

• To learn and explore the use of Multisim.

• To design a Non – inverting amplifier using LM324.

Data and Results

How would you differentiate the effect of the three trigger modes on the output waveform
as displayed in the screen?
Single - Screen refreshes evrytime it covers the whole range of the oscilloscope
Normal - The sreen follows the real-time wave pattern
Auto - It also follows the real-time wave pattern.

Position so that Cursor 1 coincides with a peak and Cursor2 with the next peak. This sets
up the measurement of the period.

What is the measured period of the waveform? 497.449microseconds

Try increasing the value of the trigger level by increments of 1V. For each change in
trigger level, reset the simulation by turning off and on the power switch.

At what trigger level voltage will the display disappear? When the trigger level is 2volts
the display disappears because the peak voltage is already exceeded which is 1.5v

Given the output waveform, what range of trigger level voltage do you expect to see an
output display?
I would expect a level no greater than 1.5v trigger level voltage to be able to display the
output

Determining the Gain of the amplifier using oscilloscope measurements


Get the peak amplitude of the output signal.
Get the peak amplitude of the input signal by using the B Channel of the oscilloscope.
Calculate the gain.
Vi = 99.428mV
Vo = 1.549V

Gain = Vo / Vi = (1.549/99.428m) = 15.58

Determining the bias conditions of the amplifier


Disconnect the signal generator from the input of the amplifier.
Connect a multimeter across the collector and emitter terminals of the transistor and
measure the DC voltage.

Vce = 7.161V
Connect a multimeter in series with the R2 and the 12-volt supply and measure the
DC current.

Ic = 12.083mA

Use the cursor to determine half-power cut-off frequency.

cut-off freq = 5.329Hz

What is the phase angle at the cut-off frequency?

angle = -63.179 degrees


Exercise

G = 15.58

Assuming Ra to be equal to 100Ohms;


calculating Rf will result to 1450Ohms

Calculating the Gain will result to G = 15.5V

Vi = 309.811V

Vo = 19.984V

G = Vo/Vi = 15.5V
Analysis and Conclusion

In our first experiment the students should have been able to familiarize

themselves using the Multisim. For our first exercise we were given a simple circuit for

us to see the usefulness of the multisim, then we were given an amplifier circuit for us to

create in the multisim. We were ask specific data’s about the circuit which I was able to

do so. After that we were also asked to design a non-inverting amplifier using LM324. I

was able to design my amplifier using the net for calculations that would be needed.

Overall the experiment was not that hard and was very straightforward all we needed was

to follow the instructions and guide questions. Being an ECE using the multisim is really

helpful.

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