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Week 2 Lab Instructions
Bipolar Junction Transistor – Biasing

1. Objectives

• To analyze a normally biased BJT circuit comprising of a BJT and resistors and measure the circuit voltages between emitter, common, base, and collector.

• To theoretically calculate and verify the circuit using Ohm’s Law, KCL and KVL.

• Determine the voltage drop across the collector load resistance and measure the current passing through the emitter and collector resistors.

1. Equipment and Parts List

Equipment:

• IBM PC or compatible
• DMM (digital multimeter)
• Variable dc power supply
Parts:

Qty. Component Tolerance Band Wattage Rating, W

1 2N3904 Transistor
6 10 K Ω   Resistor gold ¼
1 Proto Board
Hookup wires of different colors

Software: MultiSim

III. Procedure

1. Theoretical Analysis

1. Given the circuit in Figure 1, calculate the total resistance between the base and VCC in kΩ and the total collector resistance (combination of R3 and R4) in kΩ. Enter the values obtained in Table 1 on the worksheet.
Figure 1

2. Given Figure 1, calculate the circuit voltages cited below entering the values in Table 2 on the worksheet.

Voltages
VCC
Emitter to common
Base to common
Collector to common
Base to emitter
Collector to emitter

3. If resistor R2 is removed from the base circuit, calculate the circuit resistances and voltages cited below and enter the values in Tables 3 and 4 respectively on the worksheet.

Resistances (KΩ)
Base and +VCC
Total Collector Resistance

Voltages (V)
VCC
Emitter to common
Base to common
Collector to common
Base to emitter
Collector to emitter...