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MARMARA UNIVERSITY
DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING
EE202 Circuit Theory II
Laboratory 2
In this experiment AC input voltage will be rectified and DC output voltage will be obtained.
Preliminary Work
1. Set the circuit given in Figure 1 in MultiSIM and observe the waveform by an
oscilloscope. Repeat the experiment by changing the frequency of the input voltage as
10kHz, 100kHz and 1MHz. Then, observe the output waveform for 1kHz input voltage by
using the resistance and capacitance values given below: R1: 100, 10k, 100k; C1:
1nF, 100nF, 10mF
XSC1
Ext T rig
+
_
B
A
D1
V1
_
+
_
+
1N4001
R1
1kΩ
1 Vpk
1kHz
0°
C1
100pF
Figure 1: An illustration of a half-wave rectifier circuit
2. Implement the circuit given in Figure 2 in MultiSIM and obtain the waveform across the
the capacitor. Repeat the experiment by changing the frequency, resistance and
capacitance values as in first part of the preliminary work. Observe the AC signal on the
rectified waveform over the capacitor, then report the Vp-p value of the ripple voltage.
XSC1
Ext T rig
+
_
B
A
V1
1 Vpk
1kHz
0°
D1
R1
1N4001
1kΩ
+
C1
100pF
Figure 2: An illustration of a AC to DC conversion circuit
_
+
_
3. Design a rectifier circuit in Figure 3 to supress the ripple voltage measured over the
capacitor.
XSC1
Ext T rig
+
_
B
A
R1
+
_
+
_
1kΩ
V1
Rectifier
Circuit
1 Vpk
1kHz
0°
C1
100pF
Figure 3: AC to DC conversion circuit with a new rectifier circuit.
Experimental Work
1. Assemble the circuit given in Figure 1, and obtain the waveforms over resistor as in
the first part of the preliminary work.
2. Assemble the circuit given in Figure 2, and obtain the waveforms over capacitor as in
the second part of the preliminary work.
3. Assemble the circuit you design in third part of the preliminary work. Show that the
ripple voltage is supressed.
Conclusions and Comments
1. Explain the differences between the waveforms obtained in first and second parts of
the experimental work.
2. Comment on the effect of changing capacitance and resistance values on the
observed waveforms in the first and second parts of the experimental work.
3. Discuss the effect of the designed rectifier circuit on the observed waveform over the
capacitor in Figure 3.
Please note that, you should bring your preliminary work report to the laboratory. The
ones do not prepare the preliminary work report will not allow to attend to the
laboratory.