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my - TITLE LAB-6 Sine Wave Generator NAME RAVNEET KAUR...

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TITLE: LAB-6: Sine Wave Generator NAME: RAVNEET KAUR SECTION: 062 PARTNER: SAIMANI KUMAR M.N.V TA: Kaloyan Popov DATE PERFORMED: 30 th Oct 2009 DATE DUE: 6 th Nov 2009 DATE RECEIVED:
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Object The objective of this experiment is to learn the basics of electronic sine wave generation. In this experiment, a circuit design of a Wein Bridge oscillator will be performed to generate a sine wave output at a desired frequency. The experiment will require us to research oscillation and feedback circuits for practical electronic oscillators. Circuit Diagrams The DC power supply V CC = +5.0 V is connected to the ADC-DAC circuit board. The power of the ADC-DAC board is then switched on. The Digital-to-analog Conversion (DAC) 0808 chip pin numbers is shown below (Fig. 1): Fig. 1: Wein Bridge Feedback Oscillator Fig. 2: An Inverting Op-Amp circuit with the resistors R 1 and R F = 10 k
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Data Sheet 1) Op-Amp Testing : The op-amp circuit board is tested by connecting the op-amp in an inverting mode shown in Fig. 2 using the resistor R 1 and the feedback resistor R F = 10 k, with the DC voltage supply equal to +25.0 V. The output voltage obtained is an inverted version of the input voltage (See Fig. 1) which verified that the op-amp circuit board works correctly. 2) The sine generator designed in pre-lab is built (See Fig. 1) with the values of R 4 =R=10 k, and a potentiometer for R 3 . A power supply of +25.0V DC is supplied to the op-amp circuit board. The resistor R 3 is varied until a good sine output waveform is observed on the oscilloscope (See Fig. 2). The measured values of the resistors are: R = 9.968 k, R = 10.068 k, R 4 = 10.072 k, and R 3 = 20.144 k. The measured values of the capacitors are: C = 5.206 nF, and C = 5.214 nF. The calculated frequency of the sine wave is: The peak-to-peak voltage of the sine waveform generated is 21.88 V , and its frequency is 3.017 kHz . The percentage error obtained is: %Error = = 3) The potentiometer i.e., R 3 is increased slightly to find the value of the resistance R 3 at which the sine waveform generated becomes distorted (See Fig. 3). The resistance R 3 at which the waveform is distorted and has slightly flattened peaks is 22.395 k at which the peak-to-peak voltage is V PP = 22.19 V and frequency f = 2.924 kHz.
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The potentiometer i.e., R 3 is then decreased slightly to find the value of the resistance R 3 at which the sine waveform generated is almost zero (See Fig. 4). The resistance R 3 at which the waveform is distorted and has slightly flattened peaks is 20.103 k at which the peak-to-peak voltage is V PP = 2.344 V and frequency f = 3.082 kHz 4) The op-amp’s C supply voltage V PS is varied from 30 V to 5 V, and the peak-to-peak output voltage and frequency of the sine wave generated are noted down (See Table 1). Power Supply, Vps, volts Peak-to-peak output voltage, Vpp, volts Frequency, kHz 30 26.45 3.003 25 21.72 3.021 20 16.88 3.035 15 12.19 3.035 10 7.344 3.035 5 2.656 2.944 Table 1: The peak-to-peak output voltage and frequency of the generated sine waveform as the power supply voltage is varied from 30 V to 5 V.
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