ECE200_Fall08_LabManual

ECE200_Fall08_LabManual - Introduction to Signals, Circuits...

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Unformatted text preview: Introduction to Signals, Circuits & Systems A Practical Introduction to Electrical Engineering Laboratory Manual Mehmet C. Ozturk North Carolina State University Department of Electrical and Computer Engineering Raleigh, NC 2 Table of Contents Table of Contents 3 1 Circuits with Resistive Elements 1 1.1 Resistance Measurement . . . . . . . . . . . . . . . . . . . . . 1 1.1.1 Resistor Color Coding . . . . . . . . . . . . . . . . . . 1 1.1.2 Using a Multimeter to measure Resistance . . . . . . . 2 1.2 Voltage Measurement . . . . . . . . . . . . . . . . . . . . . . . 3 1.3 Current Measurement . . . . . . . . . . . . . . . . . . . . . . . 5 1.4 Photocell as a Resistive Element . . . . . . . . . . . . . . . . . 6 1.5 A Simple LED Circuit . . . . . . . . . . . . . . . . . . . . . . 7 1.6 A Night Light Circuit . . . . . . . . . . . . . . . . . . . . . . . 8 1.7 Design Your Own Circuit . . . . . . . . . . . . . . . . . . . . . 9 2 Capacitors and RC Circuits 11 2.1 Charging a Capacitor . . . . . . . . . . . . . . . . . . . . . . . 11 2.2 Discharging a Capacitor . . . . . . . . . . . . . . . . . . . . . 13 2.3 Stored Charge and Parallel Capacitors . . . . . . . . . . . . . 15 2.4 Analog Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 3 Periodic Signals in Time Domain 19 3.1 Function Generator and Oscilloscope . . . . . . . . . . . . . . 19 3.2 Music Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 3.3 Voltage Divider . . . . . . . . . . . . . . . . . . . . . . . . . . 22 3.4 Half-Wave Rectifier . . . . . . . . . . . . . . . . . . . . . . . . 25 3.5 RC Circuit with a Square Wave Input . . . . . . . . . . . . . . 28 4 Electric Power 31 4.1 AC Supply Voltage in the Laboratory . . . . . . . . . . . . . . 31 4.2 Power Dissipated by a Light Bulb . . . . . . . . . . . . . . . . 34 3 4 4.3 Power dissipated by an AC Motor . . . . . . . . . . . . . . . . 36 4.4 Light Bulb with Adjustable Power . . . . . . . . . . . . . . . . 37 5 Periodic Signals in Frequency Domain 43 5.1 Power Spectrum of a Sinusoid . . . . . . . . . . . . . . . . . . 44 5.2 Power Spectrum of a Square Wave . . . . . . . . . . . . . . . 46 5.3 Musical Instruments . . . . . . . . . . . . . . . . . . . . . . . 47 5.4 Low Pass Filter . . . . . . . . . . . . . . . . . . . . . . . . . . 48 5.5 Low Pass Filtering of Music Signals . . . . . . . . . . . . . . . 54 6 Audio Amplifier 57 6.1 Testing the Microphone Amplifier . . . . . . . . . . . . . . . . 57 6.2 Measuring the Voltage Gain . . . . . . . . . . . . . . . . . . . 60 6.3 Frequency Response of an Audio Amplifier . . . . . . . . . . . 63 6.4 Clipping and Maximum Peak-to-Peak Output Voltage . . . . . 63 6.5 Measuring the Power Gain in Frequency Domain . . . . . . . . 64 6.6 Distortion in Frequency Domain . . . . . . . . . . . . . . . . . 66 6.7 Listening to Distortion . . . . . . . . . . . . . . . . . . . . . . 67 6.8 Amplifying Music Signals . . . . . . . . . . . . . . . . . . . . . 68 6.9 Audio Amplifier with Tone Control . . . . . . . . . . . . . . .6....
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ECE200_Fall08_LabManual - Introduction to Signals, Circuits...

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