(c) Figure 4(c) shows a Wien Bridge oscillator circuit. C₂ 330 nF R3 1kQ R₂ 8kQ MI Rt st + R₁ MAM R₁₁ 10 kQ Rib 4kQ Figu

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C Figure 4 C Shows A Wien Bridge Oscillator Circuit C 330 Nf R3 1kq R 8kq Mi Rt St R Mam R 10 Kq Rib 4kq Figu 1 (131.79 KiB) Viewed 33 times

C Figure 4 C Shows A Wien Bridge Oscillator Circuit C 330 Nf R3 1kq R 8kq Mi Rt St R Mam R 10 Kq Rib 4kq Figu 2 (31.46 KiB) Viewed 33 times

C Figure 4 C Shows A Wien Bridge Oscillator Circuit C 330 Nf R3 1kq R 8kq Mi Rt St R Mam R 10 Kq Rib 4kq Figu 3 (76.28 KiB) Viewed 33 times

(c) Figure 4(c) shows a Wien Bridge oscillator circuit. C₂ 330 nF R3 1kQ R₂ 8kQ MI Rt st + R₁ MAM R₁₁ 10 kQ Rib 4kQ Figure 4(c) 33 nF V₂
(iii) The positive feedback circuit transfer function is expressed as Vf wC₁R₂ = Vow(C₁R₁ + C₂ R₂ + C₁R₂) − j(1 — w²C₁C₂R₁ R₂)
(iv) Find the expression for the resonant angular frequency. Prove that for the circuit to sustain oscillation, the oscillator's amplifier resistor relationship is given by 2R₁ = 21R3. Assuming R₂ = 2R₁ and C₂ = 10C₁. (5 marks) Calculate the range of oscillation frequency when R₁ is adjusted between its extreme ends. (2 marks)