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# Lab 5 Oscillator Cir - (4 Repeat(1-3 by changing R3 and R4 from 10 k Ω to 1 k Ω Prelab report(1 Imagine an input V in ϖ is applied as shown in

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EECS 70LB Spring 2011 Lab 5: Wien-bridge Op Amp Oscillator Circuits Reading: 2. Scherz, pp 595 6-1 Wien-Bridge Amplifier (Fig. 10.42, pp 439, Alexander) Vout t 12 V -12 V - + R1 R2 R3 R4 C C V1 Fig 1. Wien-bridge Oscillator R1=10 k , R2=variable resistor (0-100k Ω29 , R3=R4=10 k Ω, C= 0.1 μF; Connect ±Vs to ±12V. Procedure: (1) Connect the circuit as shown in Fig. 1. Adjust the value for R2 so that oscillation begins. Record the frequency and amplitude of the oscillation at both Vout and V1. (2) Increase R2 slowly, record what happens to the amplitude of the oscillation. (3) Adjust R2 so that a stable oscillation is achieved. Now increase Vs from ±12V to ±15V. Record what happens to the frequency and amplitude of the oscillation.

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Unformatted text preview: (4) Repeat (1-3) by changing R3 and R4 from 10 k Ω to 1 k Ω Prelab report: (1) Imagine an input V in ( ϖ ) is applied as shown in Fig. 2. Find the transfer function V out ( ϖ ) V in ( ) . Find the condition when oscillation starts. (Oscillation happens when Vo oscillates at frequency ϖ within needing an input Vin. Vout t 15 V-15 V-+ R1 R2 R3 R4 C C V1 AC Vin +-Fig. 2 (2) Simulate the circuit in Fig. 3 using PSPICE. Plot Vout vs. time. Use the same circuit element values as in Fig. 6.1, for R2 use R2=16k Ω , 20k Ω , and 24k Ω and comment the difference between Fig. 3. Post lab report: Report the measurement results and compare them to PSPICE simulations....
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## This note was uploaded on 02/06/2012 for the course EECS 70B taught by Professor Henrylee during the Spring '08 term at UC Irvine.

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Lab 5 Oscillator Cir - (4 Repeat(1-3 by changing R3 and R4 from 10 k Ω to 1 k Ω Prelab report(1 Imagine an input V in ϖ is applied as shown in

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