Eelab10 Repaired)

EEE3100 – Electrical and Electronics Technology 10.1) Objectives

Lab 10 – DC Analysis For Bipolar Junction Transistor

To determine operational range of BJT 10.2) Equipments and Components: a) Resistors: 270kΩ, 2.2kΩ b) BJT c) Capacitor: 2 x 10µF d) Function generator e) Multimeter f) Oscilloscope g) Connecting wires 10.3) Theory 10.4) Experiment Procedures 1. The circuit is assembled on a breadboard as in Figure 10.1. Vcc = +12V

Ib

Ic RC = 2.2k

RB = 270k 10µ Bce

AC input signal C1

AC output signal

Cce Vce

C2 = 10µ

E

Vbe

Figure 10.1: Circuit connection 2. 25mV 1kHz sinusoidal wave is applied at the AC input terminal. 3. A multimeter is used to get the voltage and current readings. 4. The experimental result is verified by calculation and the AC output signal observed is drawn.

1

EEE3100 – Electrical and Electronics Technology 10.5) Results & Discussion:

Lab 10 – DC Analysis For Bipolar Junction Transistor

IC

IC IB

IB

IE

IE

Transistor symbol

Transistor diagram

Figure 10.2: Transistor diagram and symbol Experimental result: i. IB

= 44.0 µA

ii. IC

= 5.0 mA

iii. VCE

=

iv. VB

= 0.7 V

v. VC

=

vi. VBC

= 0.55 V

Calculated values: i. VCC - IBRB - VBE = 0 IB=VCC-VBERB =12-0.7270x103 =41.85 μA ii. IC=βIB where β=100 =100 x 41.85μA =4.185 mA iii. VCE=VCC-ICRC =12-4.185mA x 2200Ω =2.793 V 2

EEE3100 – Electrical and Electronics Technology

Lab 10 – DC Analysis For Bipolar Junction Transistor

iv. VB=VCC-IBRB =12-41.85μA x 270000Ω =0.7005 V v. VC=VCC-ICRC =12-4.185mA x 2200Ω =2.793 V vi. VBC=VCE-VBE =2.793-0.7005 =2.0925 V Table 10.1: The percentage difference between the experimental result and the theoretical result

IB IC VCE VB VC VBC

Experimental result

Calculated result

44.0 µA 5.0 mA

41.85 μA 4.185 mA 2.793 V 0.7005 V 2.793 V 2.0925 V

0.7 V 0.55 V

Percentage difference =

Percentage difference (%) 4.89 16.30 -0.0714 -280.45

Measured value − Calculated value × 100% Measured value

10.6) Conclusion 10.7) References

3

EEE3100 – Electrical and Electronics Technology Lab 10 – DC Analysis For Bipolar Junction Transistor [1] Edward Hughes Electrical and Electronic Technology Ninth Edition(Publisher PEARSON Prentice Hall, Year 2005, Page 222-241) [2] J.J DeFrance Electrical Fundamental (PRENTICE HALL INC, Year 1996, Page465485) [3] Giorgio Rizzoni Principles and Applications of Electrical Engineering, 2nd edition (Publisher Tom Casson , Year 1996, Page 119-171)

4