Question 10.2: a) Determine the value of Rf necessary for the circuit in Fi...
a) Determine the value of R_f necessary for the circuit in Figure 10–14 to operate as an oscillator.
(b) Determine the frequency of oscillation.
(a) A_{c l}=29 \text {, and } B=\frac{1}{29}=\frac{R_3}{R_f} \text {. Therefore, }
\frac{R_f}{R_3}=29
R_f=29 R_3=29(10 \mathrm{k} \Omega)=290 \mathrm{k} \Omega
(b) R_1=R_2=R_3=R \text { and } C_1=C_2=C_3=C \text {. Therefore, }
f_r=\frac{1}{2 \pi \sqrt{6} R C}=\frac{1}{2 \pi \sqrt{6}(10 \mathrm{k} \Omega)(0.001 \mu \mathrm{F})} \cong 6.5 \mathrm{kHz}
P R A C T I C E EXERCISE
(a) If R_1, R_2 \text {, and } R_3 in Figure 10–14 are changed to 8.2 kΩ, what value must R_f be for oscillation?
(b) What is the value of f_r ?
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