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BJT Common Collector Lab Guide

This document describes an experiment on using a bipolar junction transistor (BJT) as a common collector amplifier. The objectives are to study the common collector configuration and simulate the circuit in Proteus. The equipment used includes an oscilloscope, function generator, transistor, resistors, and capacitors. The circuit diagram shows the input given to the base, output taken from the emitter, and collector shared between the signal source and load. Students are instructed to connect the circuit, provide a 40mVp-p input signal, observe the output waveform, and simulate the circuit in Proteus. The conclusion is that the lab helped understand the common collector amplifier diagram and circuit simulation.

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Saqib Ali
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140 views6 pages

BJT Common Collector Lab Guide

This document describes an experiment on using a bipolar junction transistor (BJT) as a common collector amplifier. The objectives are to study the common collector configuration and simulate the circuit in Proteus. The equipment used includes an oscilloscope, function generator, transistor, resistors, and capacitors. The circuit diagram shows the input given to the base, output taken from the emitter, and collector shared between the signal source and load. Students are instructed to connect the circuit, provide a 40mVp-p input signal, observe the output waveform, and simulate the circuit in Proteus. The conclusion is that the lab helped understand the common collector amplifier diagram and circuit simulation.

Uploaded by

Saqib Ali
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Air University, Islamabad

Department of Electrical Engineering


Electric Circuit Design Lab

Name: Saqib Ali 180535


Syed Ahmad Hassan 180571 A
Muhammad Uzair Ali 180511
/

LAB #03
BJT AS A COMMON COLLECTOR AMPLIFIER
OBJECTIVES
Following are the desired outcomes of our experiment:
I. Study of common collector amplifier configuration.
II. Simulation of the desired circuits on proteus.

EQUIPMENT
I. Oscilloscope
II. Function Generator
III. Transistor
IV. Resistors
V. Capacitors
VI. Digital Multimeter

ABOUT THE EXPERIMENT


A Common Collector amplifier is one of the basic single-stage bipolar junction transistor amplifier. In this circuit the
input is given at the base terminal, output is taken from the emitter and the collector is common for both. The
properties of are high input impedance , a very low output impedance, a unity(or less) voltage gain and a high current
gain. The goal of any small signal amplifier is to amplify the entire input signal with minimum distortion possible at
the output. In other words output signal is a complete replica of input signal but with larger amplitude. Given below
is the common collector configuration:
Both the signal source and the load share the collector lead as a common connection point that’s why it is called
common-collector configuration. It should be apparent that the load resistor in the common-collector amplifier
circuit receives both the base and collector currents, being placed in series with the emitter. Since the emitter lead of
a transistor is the one handling the most current (the sum of base and collector currents, since base and collector
currents always mesh together to form the emitter current), it would be reasonable to presume that this amplifier will
have a very large current gain (maximum output current for minimum input current). This presumption is indeed
correct: the current gain for a common-collector amplifier is quite large, larger than any other transistor amplifier
configuration. The Common-Collector produces an output voltage in direct rather than inverse proportion to the
rising input voltage, unlike a common-emitter amplifier. In Common-Collector amplifier output voltage is nearly
equal to the input voltage.

PROCEURE

 Connect the circuit as given in the manual.


 Give an input of 40mVp-p (f = 10 kHz) to the amplifier.
 Observe the output at Oscilloscope.
 Draw the input and output waveforms.

 Circuit Diagram
Where,

C1 = 0.1μF R1 = 10kΩ VCC = 12V

C2 = 0.1μF R2 = 6.8kΩ, Vin = 40 m Vp-p(50 kHz).


R3 = 1kΩ
R4 = 1kΩ

PROTEUS SIMULATIONS BY 180535(Saqib Ali)

Output:
Results:
Vin (mV) Frequency I in (uA) I out (mA) AI
40 100 1.71 4.12 2409.35
40 200 3.14 4.12 1312.10
40 300 4.26 4.12 967.13
40 400 5.03 4.12 819.08
40 500 5.56 4.12 741.00
40 600 5.92 4.12 695.94
40 700 6.18 4.12 666.67
40 800 6.37 4.12 646.78
40 900 6.5 4.12 633.8
40 1k 6.62 4.12 622.3
40 2k 7.04 4.12 585.2
40 3k 7.14 4.12 577.0
40 4k 7.18 4.12 573
40 5k 7.2 4.12 572.2
40 6k 7.21 4.12 571.42
40 7k 7.22 4.12 570.63
40 8k 7.22 4.12 570.63
40 9k 7.22 4.12 570.63
40 10k 7.22 4.12 570.63
PROTEUS SIMULATIONS BY 180571(Syed Ahmad Hassan)

Output:

PROTEUS SIMULATIONS BY 180511(Mohammad Uzair Ali)


Output:

CONCLUSION:
This lab provided the following conclusions to us:
I. We understood the circuit diagrams and working of BJT as common-collector amplifier.
II. We learnt how to simulate this circuit on proteus.

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