lab is based on the fundamentals of a transistor biasing and the analysis of the circuit.
The goal of Transistor Biasing is to establish a known Q-point in order for the transistor to work efficiently and produce an undistorted output signal. In bipolar transistor circuits, the Q-point is represented by ( V
CE
, I
C
) for the NPN transistors or ( V
EC
, I
C
) for PNP transistors.
Please review the following videos before getting started with this lab:
Watch the video: “
Video 3: Fundamentals of breadboard
”
Watch the video: “
Video 4: Basic electrical components
”
Watch the video: “
Video 5: Simple resistive circuit with NI myDAQ
”
Materials and Equipment:
Materials:
Hardware Parts (In the Toolbox):
An NPN transistor: 2N3904
Four resistors: 1 kΩ, 470Ω, 3 kΩ and 6 kΩ
Jumper wires
Equipment:
Hardware Equipment:
Breadboard
NI myDAQ Instrument device
Screw Driver
Screw Terminal connector
USB Cable
Multimeter with probes
Multimeter from NI ELVISmx Instrument Launcher
Procedure:
*** This lab has to be implemented only in hardware (using NI myDAQ) ***
Analyze the circuit in the Figure 1 below to calculate the following values: V
BB
, V
E
, I
E
, V
C
and V
CE
. Make sure to include 20% tolerance for each resistor in the calculations.
Construct the circuit shown in Figure 1 below on the breadboard using the transistor and two resistors (R
C
and R
E
).
Figure 1
Using the jumper wires, screw driver and screw terminal connector, connect the board to NI MyDAQ Instrument Device.
Use channel +15V pin out on the NI myDAQ Instrument Device to provide the supply voltage (V
CC
). Use channel AI0 to measure the required voltages: V
BB
, V
E
and V
C
and currents: I
C
and I
E
using the Multimeter.
Tabulate the data from step 1 and step 5.
Calculated
Measured
V
BB
V
E
V
C
I
E
I
C
Short the resistor R2 and calculate the values in steps 1.
Modify the circuit in Figure 1 to short the resistor R2 and measure the values in step 4.
Measured values with R2 shorted
V
BB
V
E
V
C
I
E
I
C
Review questions:
Compare a calculated and measured values in the table. Discuss whether the values are the same of different. If they are different, provide the reasoning. And how to reduce this difference between calculated and measured values.
What happens when R2 is shorted? Why does the measured values change?
If the NPN transistor is replaced with a PNP transistor, how does the change in the transistor effect the current and voltage in the circuit?
Deliverables:
Analysis of the circuit and calculations of voltages: V
BB
, V
E
and V
C
and currents: I
C
and I
E
.
Place your student ID card on the breadboard and take a picture of the circuit board and pin out on the NI myDAQ Instrument Device.
Take screenshots of the measurements obtained from function generator and Multimeter on the NI ELVISmx Instrument Launcher on your screen.
.
lab is based on the fundamentals of a transistor biasing and the ana.docx
1. lab is based on the fundamentals of a transistor biasing and the
analysis of the circuit.
The goal of Transistor Biasing is to establish a known Q-point
in order for the transistor to work efficiently and produce an
undistorted output signal. In bipolar transistor circuits, the Q-
point is represented by ( V
CE
, I
C
) for the NPN transistors or ( V
EC
, I
C
) for PNP transistors.
Please review the following videos before getting started with
this lab:
Watch the video: “
Video 3: Fundamentals of breadboard
”
Watch the video: “
Video 4: Basic electrical components
”
Watch the video: “
Video 5: Simple resistive circuit with NI myDAQ
”
Materials and Equipment:
Materials:
Hardware Parts (In the Toolbox):
An NPN transistor: 2N3904
Four resistors: 1 kΩ, 470Ω, 3 kΩ and 6 kΩ
Jumper wires
Equipment:
Hardware Equipment:
Breadboard
NI myDAQ Instrument device
2. Screw Driver
Screw Terminal connector
USB Cable
Multimeter with probes
Multimeter from NI ELVISmx Instrument Launcher
Procedure:
*** This lab has to be implemented only in hardware (using NI
myDAQ) ***
Analyze the circuit in the Figure 1 below to calculate the
following values: V
BB
, V
E
, I
E
, V
C
and V
CE
. Make sure to include 20% tolerance for each resistor in the
calculations.
Construct the circuit shown in Figure 1 below on the breadboard
using the transistor and two resistors (R
C
and R
E
).
Figure 1
Using the jumper wires, screw driver and screw terminal
connector, connect the board to NI MyDAQ Instrument Device.
Use channel +15V pin out on the NI myDAQ Instrument Device
to provide the supply voltage (V
CC
). Use channel AI0 to measure the required voltages: V
BB
, V
3. E
and V
C
and currents: I
C
and I
E
using the Multimeter.
Tabulate the data from step 1 and step 5.
Calculated
Measured
V
BB
V
E
V
C
I
E
I
C
Short the resistor R2 and calculate the values in steps 1.
Modify the circuit in Figure 1 to short the resistor R2 and
4. measure the values in step 4.
Measured values with R2 shorted
V
BB
V
E
V
C
I
E
I
C
Review questions:
Compare a calculated and measured values in the table. Discuss
whether the values are the same of different. If they are
different, provide the reasoning. And how to reduce this
difference between calculated and measured values.
What happens when R2 is shorted? Why does the measured
values change?
If the NPN transistor is replaced with a PNP transistor, how
does the change in the transistor effect the current and voltage
in the circuit?
Deliverables:
Analysis of the circuit and calculations of voltages: V
BB
, V
E
and V
5. C
and currents: I
C
and I
E
.
Place your student ID card on the breadboard and take a picture
of the circuit board and pin out on the NI myDAQ Instrument
Device.
Take screenshots of the measurements obtained from function
generator and Multimeter on the NI ELVISmx Instrument
Launcher on your screen.
