cameroon gce intermediate level 2024 electronic circuit 2
cameroon gce intermediate level 2024 electronic circuit 2
CIRCUIT ANALYSIS
1 1 State the following laws and theorems :
Thevenin’s theorem
Kirchhoff s current law
1.2 Consider the circuit in figure 1 below.
The circuit parameters are as follows: E = 30V; R1 = 400Q; R2 = 8000; R3 = 2000.
1.2. 1 The load RL is disconnected.
a) Determine the expression of the Norton’s equivalent current flowing between
the AB terminals and calculate its value.
b) Determine the expression of the Norton’s equivalent resistance seen
between the AB terminals and calculate its value.
1.2.2 The load RL is reconnected.
a) Draw the resultant equivalent circuit.
b) If RL = 4000, calculate the power dissipated by the load.
1.2.3 Explain when the power transferred to the load is maximum
2. DIODE CIRCUIT.
Consider the diode circuit of figure 2. The circuit parameters are as follows: R 1 = R2 = 5000;
R3 = 9.5KO; the barrier potential of the diodes VD = 0.7V.
2.1 VI = V2 = 10V(In this case, ID1 = ID2)
2.1 . 1 Calculate the current IDi
2.1 .2 Calculate the current ID;.
2.1 .3 Deduce the current ‘I’.
2.1.4 Calculate the output voltage.
2.2 VI = 10V and V2 = 0
2.2. 1 Calculate the current lDi .
2.2 .2 Calculate the current Ir>2.
2.2.3 Deduce the current T.
2.2.4 Calculate the output voltage.
2.3.2 Calculate the current ID2.
2.3.3 Deduce the current T.
2.3.4 Calculate tire output voltage.
2.4 VI = V2 = 0
2.4.1 Calculate ID1, 1D2 and deduce the output voltage.
2.5 Copy and complete the table below
BIPOLAR JUNCTION TRANSISTOR
The parameters of the circuit in figure 3 are Rc = 4RE; VBE = 0.6V; p = 100; VCEQ = 5V;
Vcc = 10V; ICQ = 1mA; IP = 10IB.
3.1 Identify the type of transistor biasing circuit used in figure 3.
3.2 Name two other transistor biasing circuits.
3.3 Determine the expression of resistance RE and calculate its value
3.4 Determine the expression of resistance Rc and calculate its value
3.5 Determine the expression of the resistance R2 and calculate its value.
3.6 Determine the expression of resistance R] and calculate its value
3.7 Calculate the power dissipated PT by the transistor.
3.8 What is the operating mode of the transistor? Explain your answer.
3.9 Determine the DC load line of the transistor and sketch it
