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Experiment #12A Op-Amp Phase Shift Oscillator Objective: To investigate RC phase oscillator using Op-Amp using LTspice XVII simulation software. Apparatus: Desktop or Laptop and LTspiceXVII simulation software Circuit Diagram: 19 ch. Flety Viewe Joe Wind DODT9Q SEX 220 + 3 ROUE AR op RF 300k V1 U1 C3 C1 C2 15v LT1055 1uF RAF 10k RAUF 10k R3 10k 15v .tran 100 startup This is und Type here to watch 27 OGOO DOO Figure 1 19 Edit Simulation Command х Transient AC Analysis DC sweep Noise DC Transfer DC op pnt Perform a non-linear, time domain simulation Stop time 100 4 Time to start saving data: Maximum Timestep Start extemal DC supply voltages at Ov: Stop simulating of steady state is detected: D Dont reset T-O when steady state is detected: Step the load current source: Skip initial operating point solution: D Syntax: tran Tprint> <Tstop> (<Tstart> [<Tmaxstep>] [<option> <option>] ...) tran 0 100 0 4 startup Cancel OK Figure 2 TLD Dhe Ye Bot Settings Sition Jobs Window bele DOUTOR EX 2 +3000 CEME D D FR 10 GV IV AV 9V 4701 Type here to search 27 pm we ao o o o o 4 Figure 3

Procedures : 1. Choose Vcc = +15V, Vee = - 15 2. Choose Capacitance value: 1uF <C<10 uF 3. Choose resistor R: 5k <R <20k 4. Rf must be equal to 30 x R 5. Connect all devices and supply like that of figure 1 6. Edit Simulation command like that of figure 2 7. Simulate the circuit.. you must get the waveform like that of figure 3 8. REDO the process, this time RF exactly equal to 29 time R Questions 1. From the results in figure 3, why it takes time to take the circuit in oscillation? How long does it take bring the circuit into oscillation? What is the peak to peak voltage swing? Can you show graphically the signal output frequency? Is it equal to the fo in theoretical? 2. In #8, does the circuit oscillate? Why? Show Simulation Result: Save as a pictures with corresponding parameters ( limit 10 pics ) Show computation result for theoretical side: 8 / 12 Observation: Conclusion: