As the feedback is tapped to the inverting input, the operationalamplifier is therefore connected to the so called "inverting amplifier"configuration which outputs the needed 180 degree phase shift.
RC oscillations are stable and the RC oscillators produces a well-shapedsine wave with the frequency being proportional to 1/RC and ergo, a widerfrequency range may occur when using a variable capacitor.In order to sustain/maintain the oscillations given below, the operationalamplifiers gain must be equal to 29.:𝑅???= −𝑅IV.ResourcesComputer with NI Multisim 13.0installedComponents used in Multisim741Op-AmpResistorsCapacitorsOscilloscopeV.Procedure1.) Open Multisim software2.) Build the circuit as shown3.) Connect the positive input of the op-amp to ground.4.) Connect R5 and R4 in which R5=1.2kohms and R4 is a variable resistor.5.) Build the RC network. C1=C2=C3 and R1=R2=R3.
6.) Observe the input and output signal using an oscilloscope.7.) Find the value of R4. Adjust the variable resistor R4 such that the gain would be equal to 29.8.) Observe the input and output signal again and sketch their respective waveforms such that the input signal is a dotted-signal while the output is a continuous signal.9.) Calculate for the frequency of the oscillator.10.) Observe each RC section of the oscillator using an oscilloscope.11.) With R=R1=R2=R3 and C=C1=C2=C3, Change the values inside the RC network as follows and complete the following table.
Course:Experiment No.:Group no.:Section:Group Members:Date Performed:Date Submitted:Instructor:VI.Data and Results:Waveform 1Table1Table1
Table2VII.Observation:VIII.Interpretation:IX.Question and Problems:a. How does the RC stages affect the oscillator?__ FrequencyRfAv2TRIALRESISTORCAPACITORFREQUENCY(CALCULATED)11nF6.5 kHz21kΩ8nF
_ _ b. Why does it uses 3 RC stages?_ _ _ _ c. What happens when the variable resistor R4 is adjusted?_ _ _ _ d.What is the total phase shift of the circuit?Explain._ _ _ _ e.Why is it essential to have a unity loop gain and a degree phase shift? Why is it necessary to haveAv equal to29?__ _ _
X.Assessment (Rubric for LaboratoryPerformance):
CRITERIABEGINNER 1ACCEPTABLE 2PROFICIENT 3SCOREI. Laboratory SkillsManipulative SkillsMembers do not demonstrate neededskills.Members occasionally demonstrate neededskills.Members always demonstrate neededskills.Experimental Set-upMembers are unable to set up the materials.Members are able to set up thematerials with supervision.Members are able to set up thematerials with minimum supervision.Process SkillsMembers do not demonstrate targeted process skills.Members occasionally demonstrate targeted process skills.Members always demonstrate targeted process skills.Safety PrecautionsMembers do not follow safety precautions.Members follow safety precautions most of the time.Members follow safety precautions at alltimes.
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