Q.2/ Find the value of R2 in figure below so that the circuit will oscillate.Q.3/ For the circuit shown below, find Rf if rds for the JFET is 350 ohms when oscillation is stable.Q.4/ Find Rf and fr:Q.5/ How to change the frequency of oscillation of the following circuit to 10kHz?Q.6/ Modify the sawtooth generator in figure below so that its peak-to-peak output is 4V. Is it aVCO?Q.7/ To what value must Cext be changed in figure below to achieve a frequency of 25kHz?What is the benefit of C1? Can be neglected?Q.8/ What is the crystal oscillator? Explain its principle of operation. Explain how to connect a crystal with frequency of 10MHz to a microcontroller? Q.2/ Find the value of R2 in figure below so that the circuit will oscillate.DD26.8 V 6.8 VR3R47 k100 kf2R.0.015 µF 1.0 kNRs1.0 kf0.015 µF0.3/ For the circuit shown below, find Rf if rds for the JFET is 350 ohms when oscillation isstable.R10 kf.0.015 µFR>1.0 kfVour- DIN9142N54581.0 kf"0.015 µFR820 21.0 µF10 kf.Q.4/ Find Rf and fr:RR,4.7 k0.022 μF 0.022 μ | 0022 μF |4.7 kfN4.7 klQ.5/ How to change the frequency of oscillation of the following circuit to 10kHz?R0.022 uF22 k56 kfRy18 kl Q.6/ Modify the sawtooth generator in figure below so that its peak-to-peak output is 4V. Is it aVCO?+12 V100 kf47 kf-12 VR100 ki0.0022 uFR100 kR222 kiQ.7/ To what value must Cext be changed in figure below to achieve a frequency of 25kHz?+5.5 V1.0 kRESETVccDISCH555R23.3 k.THRESHOUTTRIGCONTCeuF0.047 uFGND=0,01 µFWhat is the benefit of C1? Can be neglected?Q.8/ What is the crystal oscillator? Explain its principle of operation. Explain how to connect acrystal with frequency of 10MHZ to a microcontroller?Best WishesDr. Ali A. Abed, 2021

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Answered: Q.2/ Find the value of R2 in figure…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Q.2/ Find the value of R2 in figure below so that the circuit will oscillate.
Q.3/ For the circuit shown below, find Rf if rds for the JFET is 350 ohms when oscillation is
stable.
Q.4/ Find Rf and fr:
Q.5/ How to change the frequency of oscillation of the following circuit to 10kHz?
Q.6/ Modify the sawtooth generator in figure below so that its peak-to-peak output is 4V. Is it a
VCO?
Q.7/ To what value must Cext be changed in figure below to achieve a frequency of 25kHz?What is the benefit of C1? Can be neglected?
Q.8/ What is the crystal oscillator? Explain its principle of operation. Explain how to connect a
crystal with frequency of 10MHz to a microcontroller?

Q.2/ Find the value of R2 in figure below so that the circuit will oscillate.
D
D2
6.8 V 6.8 V
R3
R
47 k
100 kf2
R.
0.015 µF 1.0 kN
Rs
1.0 kf
0.015 µF
0.3/ For the circuit shown below, find Rf if rds for the JFET is 350 ohms when oscillation is
stable.
R
10 kf.
0.015 µF
R
>1.0 kf
Vour
- D
IN914
2N5458
1.0 kf
"0.015 µF
R
820 2
1.0 µF
10 kf.
Q.4/ Find Rf and fr:
R
R,
4.7 k
0.022 μF 0.022 μ | 0022 μF |
4.7 kfN
4.7 kl
Q.5/ How to change the frequency of oscillation of the following circuit to 10kHz?
R
0.022 uF
22 k
56 kf
Ry
18 kl

Q.6/ Modify the sawtooth generator in figure below so that its peak-to-peak output is 4V. Is it a
VCO?
+12 V
100 kf
47 kf
-12 V
R
100 ki
0.0022 uF
R
100 k
R2
22 ki
Q.7/ To what value must Cext be changed in figure below to achieve a frequency of 25kHz?
+5.5 V
1.0 k
RESET
Vcc
DISCH
555
R2
3.3 k.
THRESH
OUT
TRIG
CONT
Ceu
F0.047 uF
GND
=0,01 µF
What is the benefit of C1? Can be neglected?
Q.8/ What is the crystal oscillator? Explain its principle of operation. Explain how to connect a
crystal with frequency of 10MHZ to a microcontroller?
Best Wishes
Dr. Ali A. Abed, 2021

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