# saimani - TITLE: LAB-6: Sine Wave Generator NAME: SAIMANI...

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TITLE: LAB-6: Sine Wave Generator NAME: SAIMANI KUMAR M.N.V (11554210) SECTION: 062 PARTNER: RAVNEET KAUR TA: Kaloyan Popov DATE PERFORMED: 30 th Oct 2009 DATE DUE: 6 th Nov 2009 DATE RECEIVED:

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Objective The objective of this experiment is to learn about sine wave generation by using electronic oscillators which apply the techniques of feedback and oscillation circuits. The sine wave generator is first designed to obtain the sine wave having the desired frequency, and then is built and tested. 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
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 1 = 9.968 k, R 2 = 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
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## This note was uploaded on 12/02/2011 for the course ECEL 353 taught by Professor Gerber during the Spring '11 term at Hanoi University of Technology.

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saimani - TITLE: LAB-6: Sine Wave Generator NAME: SAIMANI...

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