1. BJT Characteristics & Biasing Circuits
EXPERIMENT 7
BJT Characteristics & Biasing Circuits

2. Voltage-Divider-Bias Configuration
PART B
Voltage-Divider-Bias Configuration

3. BJT - 2N3904 C B E

4. Measure all resistor values (R1, R2, RE and RC) from circuit in Fig. 7
Measure all resistor values (R1, R2, RE and RC) from circuit in Fig. 7.2 using DMM. Record them

6. Construct the network of Fig. 7. 2 and measure VB, VE, VC and VCE
Construct the network of Fig. 7.2 and measure VB, VE, VC and VCE. Record them in Table 7.2.
Table 7.2
VB(V)
VE(V)
VC(V)
VCE(V)
IE(mA)
IC(mA)
Measured (Step 3&4)
4.4 V 
3.7 V 
3.86 V 
0.16 V 

7. Measure the voltages VR1 and VR2
Measure the voltages VR1 and VR2. Calculate the currents I1 and I2 using Ohm’s Law.
VR1
VR1 = 15.6 V
I1 = mA
VR2 = 4.4 V
I2 = Ma
So IB = II – I2 = mA

8. Using Kirchoff’s current law, calculate the current IB
Using Kirchoff’s current law, calculate the current IB. Then, measure the currents IE and IC values. Then complete Table 7.2
Confirm that IB calculated using KCL is equal to the IE-IC

9. I1 = _______________, I2 = ________________
VB(V)
VE(V)
VC(V)
VCE(V)
IE(mA)
IC(mA)
Measured (Step 3&4)
4.4 V 
3.7 V 
3.86 V 
0.16 V 
5.441 mA 
5.382 mA 
I1 = _______________, I2 = ________________
  Using KCL, IB = _______________
IB = IE – IC = mA