Week 5 Lab – Transistor Biasing

Electronics I and Lab

Transistor Biasing

Introduction:

Week 5 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 ( VCE, IC ) for the NPN transistors or ( VEC, IC ) for PNP transistors.

Please review the following videos before getting started with this lab:

1. Watch the video: “Video 3: Fundamentals of breadboard”

2. Watch the video: “Video 4: Basic electrical components”

3. Watch the video: “Video 5: Simple resistive circuit with NI myDAQ”

4. Watch the video: Design of a voltage-divider biased common-emitter amplifier using MultiSim and myDAQ

5. View the image: Amp DC Components

Materials and Equipment:

Materials:

· Hardware Parts (In the Toolbox):

. An NPN transistor: 2N3904

. Four resistors: 1 k?, 470?, 3 k? and 6 k?

. 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) ***

1. Analyze the circuit in the Figure 1 below to calculate the following values: VB, VE, IE, VC and VCE.

2. Construct the circuit shown in Figure 1 below on the breadboard using the transistor and two resistors (RCand RE).