EE3110M_SemA08

# EE3110M_SemA08 - City University of Hong Kong Department of...

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- 1 - City University of Hong Kong Department of Electronic Engineering Experiment EE3110.1 Oscillators OBJECTIVES 1. To study and implement a transistor RC phase shift oscillator. EQUIPMENT REQUIRED 1. Regulated variable power supply (0-30V) 2. DVM 3. Oscilloscope 4. Breadboard and multi-purpose PCB 5. Soldering iron 6. Frequency counter 7. Audio signal generator COMPONENTS Transistor : Ql=2N2222, Resistors : Rl=3.3K Ω , R2=300K Ω , R3=R4=4.7K Ω , Re=24 Ω , Capacitors : Cl=C2=C3=47nF, Measurement Load = 4.7K Ω PROCEDURE 1. The circuit diagram for an RC phase shift network is shown in Figure 1. Construct this circuit on the breadboard. 47nF 47nF 47nF C1 C3 C2 4.7K 4.7K 4.7K R3 R4 MEASUREMENT LOAD INPUT OUTPUT Figure 1

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- 2 - 2. Check the circuit carefully and apply a sine wave to the input of the network. The peak-to-peak amplitude of the sine wave should be within 1 to 3 volts. 3. Monitor the output of the network using an oscilloscope. Keeping the input signal with constant amplitude, vary the frequency of the input sine wave (within audio range) and measure the amplitude and phase shift at the output. Plot the phase shift and amplitude of the output signal against frequency. 4. Connect the single stage common emitter transistor amplifier shown in Figure 2. +12V
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## This note was uploaded on 01/11/2011 for the course EE 3110 taught by Professor Wingshingchan during the Fall '08 term at City University of Hong Kong.

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EE3110M_SemA08 - City University of Hong Kong Department of...

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