initial commit / add all books

33 files changed, 564 insertions, 0 deletions

diff --git a/275/CH5/EX5.5.10/Ch5_5_10.sce b/275/CH5/EX5.5.10/Ch5_5_10.sce
new file mode 100755
index 000000000..903318ed3
--- /dev/null
+++ b/275/CH5/EX5.5.10/Ch5_5_10.sce
@@ -0,0 +1,19 @@
+clc

+disp("Example 5.10")

+printf("\n")

+disp("Calculate overall voltage gain in db & output voltage when input voltage is 1uV for cascaded amplifier")

+printf("Given\n")

+//Voltage gain of amplifier

+Av1=10

+Av2=100

+Av3=1000

+//input voltage

+Vi=10^-6

+//overall voltage gain

+Av=Av1*Av2*Av3

+//in db

+Avdb=20*log10(Av)

+//output voltage when input voltage is 10^-6V

+Vo=Av*Vi

+printf("overall voltage gain in dB \n%f dB\n",Avdb)

+printf("output voltage \n%f volt\n",Vo)

diff --git a/275/CH5/EX5.5.11/Ch5_5_11.sce b/275/CH5/EX5.5.11/Ch5_5_11.sce
new file mode 100755
index 000000000..4d9c0ca28
--- /dev/null
+++ b/275/CH5/EX5.5.11/Ch5_5_11.sce
@@ -0,0 +1,13 @@
+clc

+disp("Example 5.11")

+printf("\n")

+disp("Calculate overall voltage gain in db of cascaded 2 stage amplifier")

+printf("Given\n")

+//Voltage gain

+Av1=10

+Av2=20

+//overall voltage gain 

+Av=Av1*Av2

+//in db

+Avdb=20*log10(Av)

+printf("Overall gain is \n%f dB\n",Avdb)

diff --git a/275/CH5/EX5.5.12/Ch5_5_12.sce b/275/CH5/EX5.5.12/Ch5_5_12.sce
new file mode 100755
index 000000000..cf02c1dc7
--- /dev/null
+++ b/275/CH5/EX5.5.12/Ch5_5_12.sce
@@ -0,0 +1,32 @@
+clc

+disp("Example 5.12")

+printf("\n")

+disp("Calculate overall voltage gain ,gain of 2nd & 3rd stage,input voltage of 2nd stage & all in db of three stage amplifier")

+printf("Given\n")

+//input voltage 

+Vi=0.05

+//output voltage

+Vo=150

+//voltage gain of 1st stage

+Av1=20

+//input to 3rd stage

+V2=15

+//overall voltage gain 

+Av=Vo/Vi

+//input to 2nd stage

+V1=Av1*Vi

+//voltage gain of 2nd stage

+Av2=V2/V1

+//voltage gain of 3rd stage

+Av3=Vo/V2

+//all stages gain in db

+Av1db=20*log10(Av1)

+Av2db=20*log10(Av2)

+Av3db=20*log10(Av3)

+//overall gain in db

+Av=Av1db+Av2db+Av3db

+printf("overall voltage gain \n%f\n",Av)

+printf("voltage gain of 2nd & 3rd stages \n%f\n%f\n",Av2,Av3)

+printf("input voltage of 2nd stage \n%f volt\n",V1)

+printf("Decibal voltage gain of 1st, 2nd, 3rd stage \n%fdB\n%fdB\n%fdB\n",Av1db,Av2db,Av3db)

+printf("Overall gain in db \n%f dB\n",Av)

diff --git a/275/CH5/EX5.5.15/Ch5_5_15.sce b/275/CH5/EX5.5.15/Ch5_5_15.sce
new file mode 100755
index 000000000..0983b8deb
--- /dev/null
+++ b/275/CH5/EX5.5.15/Ch5_5_15.sce
@@ -0,0 +1,24 @@
+clc

+disp("Example 5.15")

+printf("\n")

+disp("For CE amplifier shown in fig 5.5 find R1,R2,Re & Rc")

+printf("Given\n")

+Vcc=24

+//load resistance

+RL=120*10^3

+//since Rc<<RL

+Rc=RL/10

+//select Ve & Vce

+Ve=5

+Vce=3

+Vrc=Vcc-Vce-Ve  //from circuit

+Ic=Vrc/Rc

+//find Re

+Re=Ve/Ic

+R2=10*Re

+//Vbe for si transistor

+Vbe=0.7

+Vb=Vbe+Ve

+I2=Vb/R2

+R1=(Vcc-Vb)/I2

+printf("The resistance values are\nR1=%f ohm\nR2=%f ohm\nRe=%f ohm\nRc=%f ohm\n",R1,R2,Re,Rc)

diff --git a/275/CH5/EX5.5.16/Ch5_5_16.sce b/275/CH5/EX5.5.16/Ch5_5_16.sce
new file mode 100755
index 000000000..66162069d
--- /dev/null
+++ b/275/CH5/EX5.5.16/Ch5_5_16.sce
@@ -0,0 +1,24 @@
+clc

+disp("Example 5.16")

+printf("\n")

+disp("For CE amplifier shown in fig 5.5 find R1,R2,Re & Rc")

+printf("Given\n")

+Vcc=18

+//load resistance

+RL=56*10^3

+//since Rc<<RL

+Rc=RL/10

+//select Ve & Vce

+Ve=5

+Vce=3

+Vrc=Vcc-Vce-Ve  //from circuit

+Ic=Vrc/Rc

+//find Re

+Re=Ve/Ic

+R2=10*Re

+//Vbe for si transistor

+Vbe=0.7

+Vb=Vbe+Ve

+I2=Vb/R2

+R1=(Vcc-Vb)/I2

+printf("The resistance values are\nR1=%f ohm\nR2=%f ohm\nRe=%f ohm\nRc=%f ohm\n",R1,R2,Re,Rc)

diff --git a/275/CH5/EX5.5.19/Ch5_5_19.sce b/275/CH5/EX5.5.19/Ch5_5_19.sce
new file mode 100755
index 000000000..4ba2ed5a9
--- /dev/null
+++ b/275/CH5/EX5.5.19/Ch5_5_19.sce
@@ -0,0 +1,17 @@
+clc

+disp("Example 5.19")

+printf("\n")

+disp("calculate upper cut-off frequency & voltage gain at lower cut-off frequency")

+printf("Given\n")

+//bandwidth of amplifier

+BW=500*10^3

+//lower cut-off frequency

+f1=25

+//midband gain

+Ao=120

+//upper cut-off frequency

+f2=BW+f1

+//voltage gain at lower cut-off frequency

+A1=Ao/sqrt(2)

+printf("upper cut-off frequency \n %f hz\n",f2)

+printf("Voltage gain at lower cut-off frequency \n %f \n",A1)
\ No newline at end of file
diff --git a/275/CH5/EX5.5.23/Ch5_5_23.sce b/275/CH5/EX5.5.23/Ch5_5_23.sce
new file mode 100755
index 000000000..bcf5efe1c
--- /dev/null
+++ b/275/CH5/EX5.5.23/Ch5_5_23.sce
@@ -0,0 +1,20 @@
+clc

+disp("Example 5.23")

+printf("\n")

+disp("calculate closed-loop gain for the negative feedback amplifier")

+printf("Given\n")

+//voltage gain without feedback

+Av=100000

+//feedback factor

+B=1/100

+//voltage gain with feedback

+Acl=Av/(1+(B*Av))

+//when Av is changed by 50%

+Av1=50*100000/100

+Av2=Av+Av1

+//voltage gain with feedback when Av changed by +50%

+Acl1=Av2/(1+(B*Av2))

+//voltage gain with feedback when Av changed by -50%

+Av3=Av-Av1

+Acl2=Av3/(1+(B*Av3))

+printf("closed loop gain of negative feedback amplifier is \n %f \n",Acl2)
\ No newline at end of file
diff --git a/275/CH5/EX5.5.24/Ch5_5_24.sce b/275/CH5/EX5.5.24/Ch5_5_24.sce
new file mode 100755
index 000000000..6997820a4
--- /dev/null
+++ b/275/CH5/EX5.5.24/Ch5_5_24.sce
@@ -0,0 +1,12 @@
+clc

+disp("Example 5.24")

+printf("\n")

+disp("calculate closed-loop gain for the negative feedback amplifier")

+printf("Given\n")

+//voltage gain without feedback

+Av=1000

+//feedback factor

+B=0.1

+//voltage gain with feedback

+Acl=Av/(1+(B*Av))

+printf("closed loop gain of negative feedback amplifier is \n %f \n",Acl)
\ No newline at end of file
diff --git a/275/CH5/EX5.5.27/Ch5_5_27.sce b/275/CH5/EX5.5.27/Ch5_5_27.sce
new file mode 100755
index 000000000..1bbb116f3
--- /dev/null
+++ b/275/CH5/EX5.5.27/Ch5_5_27.sce
@@ -0,0 +1,23 @@
+clc

+disp("Example 5.27")

+printf("\n")

+disp("calculate input impedance of amplifier with negative feedback")

+printf("Given\n")

+//input impedance without feedback

+Zb=10^3

+//open loop voltage gain

+Av=100000

+//feedback network resistance

+RF1=56*10^3

+RF2=560

+//input side resistance

+R1=68*10^3

+R2=33*10^3

+//feedback factor

+B=RF2/(RF1+RF2)

+//input impedance with feedback

+Zi=Zb*(1+(B*Av))

+//input impedance with feedback by considering R1 & R2

+Rp=(R1*R2)/(R1+R2)

+Zin=(Zi*Rp)/(Zi+Rp)

+printf("input impedance with negative feedback \n%f ohm\n",Zin)

diff --git a/275/CH5/EX5.5.29/Ch5_5_29.sce b/275/CH5/EX5.5.29/Ch5_5_29.sce
new file mode 100755
index 000000000..b7c5fcd29
--- /dev/null
+++ b/275/CH5/EX5.5.29/Ch5_5_29.sce
@@ -0,0 +1,29 @@
+clc

+disp("Example 5.29")

+printf("\n")

+disp("calculate input & output impedance of amplifier with negative feedback")

+printf("Given\n")

+//input impedance without feedback

+Zb=10^3

+//open loop voltage gain

+Av=7533

+//input side resistance

+R1=68*10^3

+R2=47*10^3

+//feedback factor

+B=1/101

+//input impedance with feedback

+Zi=Zb*(1+(B*Av))

+//input impedance with feedback by considering R1 & R2

+Rp=(R1*R2)/(R1+R2)

+Zin=(Zi*Rp)/(Zi+Rp)

+//output impedance without feedback

+Zc=50*10^3

+Rc=3.9*10^3

+//output impedance with feedback

+Zo=Zc/(1+(B*Av))

+//output impedance with feedback by considering Rc

+Zout=(Rc*Zo)/(Rc+Zo)

+printf("input impedance with negative feedback \n%f ohm\n",Zin)

+printf("output impedance with negative feedback \n%f ohm\n",Zout)

+

diff --git a/275/CH5/EX5.5.3/Ch5_5_3.sce b/275/CH5/EX5.5.3/Ch5_5_3.sce
new file mode 100755
index 000000000..41783e61a
--- /dev/null
+++ b/275/CH5/EX5.5.3/Ch5_5_3.sce
@@ -0,0 +1,12 @@
+clc

+disp("Example 5.3")

+printf("\n")

+disp("Calculate output power change in decibel of amplifier")

+printf("Given\n")

+//output power when frequency is 5khz

+P1=50*10^-3

+//output power when frequency is 20khz

+P2=25*10^-3

+//output power change in decibel

+delPo=10*log10(P2/P1)

+printf("output power change \n%f dB\n",delPo)

diff --git a/275/CH5/EX5.5.35/Ch5_5_35.sce b/275/CH5/EX5.5.35/Ch5_5_35.sce
new file mode 100755
index 000000000..372a4d7f8
--- /dev/null
+++ b/275/CH5/EX5.5.35/Ch5_5_35.sce
@@ -0,0 +1,17 @@
+clc

+disp("Example 5.35")

+printf("\n")

+disp("Estimate the closed loop upper cut-off frequency & total harmonic distortion")

+printf("Given\n")

+//open loop gain

+Av=60000

+//closed loop gain

+Acl=300

+//open loop upper cut-off frequency

+F2OL=15*10^3

+//closed loop upper cut-off frequency & Av/Acl=(1+BAv)

+F2CL=F2OL*Av/Acl

+//total harmonic distortion with feedback if there is 10% distortion without feedback

+HD=10/(Av/Acl)

+printf("closed loop upper cut-off frequency \n%f hz\n",F2CL)

+printf("total harmonic distortion with feedback if there is 10per distortion without feedback \n%f\n",HD)

diff --git a/275/CH5/EX5.5.36/Ch5_5_36.sce b/275/CH5/EX5.5.36/Ch5_5_36.sce
new file mode 100755
index 000000000..4790007e2
--- /dev/null
+++ b/275/CH5/EX5.5.36/Ch5_5_36.sce
@@ -0,0 +1,15 @@
+clc

+disp("Example 5.36")

+printf("\n")

+disp("calculate open loop cut-off frequency if the open loop gain is 200000")

+printf("Given\n")

+//open loop gain

+Av=200000

+//closed loop gain 

+Acl=250

+//upper cut-off frequency with feedback

+F2CL=4*10^6

+//upper cut-off frequency without feedback

+F2OL=F2CL/(Av/Acl)

+printf("upper cut-off frequency without feedback \n%f hz\n",F2OL)

+

diff --git a/275/CH5/EX5.5.37/Ch5_5_37.sce b/275/CH5/EX5.5.37/Ch5_5_37.sce
new file mode 100755
index 000000000..8b4754205
--- /dev/null
+++ b/275/CH5/EX5.5.37/Ch5_5_37.sce
@@ -0,0 +1,16 @@
+clc

+disp("Example 5.37")

+printf("\n")

+disp("calculate the phase shift with negative feedback")

+printf("Given\n")

+//open loop phase shift

+Po=15

+//open loop gain

+Av=60000

+//closed loop gain

+Acl=300

+//to calculate phase shift with feedback

+AvB=(Av/Acl)-1

+k=((AvB*sin(Po*%pi/180))/(1+(AvB*cos(Po*%pi/180))))

+Pcl=Po-(atan(k)*180/%pi)

+printf("The phase shift with negative feedback=\t%f degree\n",Pcl)

diff --git a/275/CH5/EX5.5.38/Ch5_5_38.sce b/275/CH5/EX5.5.38/Ch5_5_38.sce
new file mode 100755
index 000000000..5bff9a152
--- /dev/null
+++ b/275/CH5/EX5.5.38/Ch5_5_38.sce
@@ -0,0 +1,20 @@
+clc

+disp("Example 5.38")

+printf("\n")

+disp("calculate bandwidth,gain & harmonic distortion with feedback")

+printf("Given\n")

+//open loop gain

+Av=1000

+//bandwidth without feedback

+BWol=500*10^3

+//feedback factor

+B=0.1

+//bandwidth with feedback

+BWcl=BWol*(1+(B*Av))

+//closed loop gain

+Acl=Av/(1+(B*Av))

+//harmonic distortion if 15% negative feedback used

+HDcl=15/(1+(B*Av))

+printf("bandwidth with feedback is \n %f hz \n",BWcl)

+printf("closed loop gain \n %f \n",Acl)

+printf("Harmonic distortion with feedback \n %f \n",HDcl)
\ No newline at end of file
diff --git a/275/CH5/EX5.5.4/Ch5_5_4.sce b/275/CH5/EX5.5.4/Ch5_5_4.sce
new file mode 100755
index 000000000..4b6446a9b
--- /dev/null
+++ b/275/CH5/EX5.5.4/Ch5_5_4.sce
@@ -0,0 +1,12 @@
+clc

+disp("Example 5.4")

+printf("\n")

+disp("Calculate output power change in decibel of amplifier")

+printf("Given\n")

+//output voltage of amplifier when frequency 3khz

+V1=2

+//output voltage of amplifier when frequency 50khz

+V2=0.5

+//output power change in decibel

+delPo=20*log10(V2/V1)

+printf("output power change \n%f dB\n",delPo)

diff --git a/275/CH5/EX5.5.40/Ch5_5_50.sce b/275/CH5/EX5.5.40/Ch5_5_50.sce
new file mode 100755
index 000000000..c5f6b605c
--- /dev/null
+++ b/275/CH5/EX5.5.40/Ch5_5_50.sce
@@ -0,0 +1,20 @@
+clc

+disp("Example 5.50")

+printf("\n")

+disp("calculate the frequency of oscillation & feedback factor of Hartley oscillator")

+printf("Given\n")

+//inductance

+L1=2*10^-3

+L2=8*10^-3

+//mutual inductance

+M=100*10^-6

+//capacitor

+C=0.001*10^-6

+//total inductance 

+L=L1+L2+M

+//frequency of oscillation

+f=1/(2*%pi*sqrt(L*C))

+//feedback factor

+B=L1/L2

+printf("frequency of oscillation of hartley oscillator \n %f hz \n",f)

+printf("feedback factor \n %f \n",B)
\ No newline at end of file
diff --git a/275/CH5/EX5.5.43/Ch5_5_43.sce b/275/CH5/EX5.5.43/Ch5_5_43.sce
new file mode 100755
index 000000000..cb9d68563
--- /dev/null
+++ b/275/CH5/EX5.5.43/Ch5_5_43.sce
@@ -0,0 +1,10 @@
+clc

+disp("Example 5.43")

+printf("\n")

+disp("calculate the frequency of oscillation of RC phase shift oscillator")

+printf("Given\n")

+R=500

+C=0.1*10^-6

+//frequency of oscillation

+f=1/(2*%pi*R*C*sqrt(6))

+printf("frequency of oscillation \n%f hz\n",f)

diff --git a/275/CH5/EX5.5.44/Ch5_5_44.sce b/275/CH5/EX5.5.44/Ch5_5_44.sce
new file mode 100755
index 000000000..76b4dc61f
--- /dev/null
+++ b/275/CH5/EX5.5.44/Ch5_5_44.sce
@@ -0,0 +1,11 @@
+clc

+disp("Example 5.44")

+printf("\n")

+disp("calculate the value of Capacitor for a RC phase shift oscillator")

+printf("Given\n")

+R=1000

+//frequency of oscillation

+f=5000

+//capacitor value

+C=1/(2*%pi*R*f*sqrt(6))

+printf("Capacitor value \n%e farad \n",C)

diff --git a/275/CH5/EX5.5.45/Ch5_5_45.sce b/275/CH5/EX5.5.45/Ch5_5_45.sce
new file mode 100755
index 000000000..7cd54acb5
--- /dev/null
+++ b/275/CH5/EX5.5.45/Ch5_5_45.sce
@@ -0,0 +1,12 @@
+clc

+disp("Example 5.45")

+printf("\n")

+disp("calculate the value of R & c for RC phase shift oscillator")

+printf("Given\n")

+//oscillating frequency

+f=2000

+//select Capacitor value

+C=0.1*10^-6

+//resistance value 

+R=1/(2*%pi*f*C*sqrt(6)) 

+printf("Resistance value \n%f ohm\n",R)

diff --git a/275/CH5/EX5.5.49/Ch5_5_49.sce b/275/CH5/EX5.5.49/Ch5_5_49.sce
new file mode 100755
index 000000000..b1dc0300c
--- /dev/null
+++ b/275/CH5/EX5.5.49/Ch5_5_49.sce
@@ -0,0 +1,17 @@
+clc

+disp("Example 5.49")

+printf("\n")

+disp("calculate frequency of oscillation,feedback factor & gain required for sustained oscillation of hartley oscillator")

+printf("Given\n")

+//inductance

+L1=5*10^-3

+L2=10*10^-3

+//capacitor

+C=0.01*10^-6

+//frequency of oscillation

+f=1/(2*%pi*sqrt((L1+L2)*C))

+//feedback factor

+B=L1/L2

+//gain required for sustained oscillation

+Av=L2/L1

+printf("gain required for sustained oscillation=\t>%f\n",Av)
\ No newline at end of file
diff --git a/275/CH5/EX5.5.5/Ch5_5_5.sce b/275/CH5/EX5.5.5/Ch5_5_5.sce
new file mode 100755
index 000000000..392a76eb9
--- /dev/null
+++ b/275/CH5/EX5.5.5/Ch5_5_5.sce
@@ -0,0 +1,13 @@
+clc

+disp("Example 5.5")

+printf("\n")

+disp("Calculate power gain of amplifier")

+printf("Given\n")

+//have equal input & load resistance

+//input voltage

+Vi=100*10^-3

+//output voltage

+Vo=3

+//power gain of amplifier

+Apdb=20*log10(Vo/Vi)

+printf("power gain of amplifier \n%f\n",Apdb)

diff --git a/275/CH5/EX5.5.51/Ch5_5_51.sce b/275/CH5/EX5.5.51/Ch5_5_51.sce
new file mode 100755
index 000000000..027eabd74
--- /dev/null
+++ b/275/CH5/EX5.5.51/Ch5_5_51.sce
@@ -0,0 +1,18 @@
+clc

+disp("Example 5.51")

+printf("\n")

+disp("calculate the value of L1 & L2 of Hartley oscillator")

+printf("Given\n")

+//frequency of oscillation

+f=25*10^3

+C=0.02*10^-6

+//feedback factor

+B=0.2

+//Total inductance

+L=1/(4*(%pi)^2*f^2*C)

+L1byL2=B

+L1plusL2=L

+//therefore

+L2=L/1.2

+L1=L-L2

+printf("The values of L1=\t%f henry\nL2=\t%f henry\n",L1,L2)

diff --git a/275/CH5/EX5.5.53/Ch5_5_53.sce b/275/CH5/EX5.5.53/Ch5_5_53.sce
new file mode 100755
index 000000000..fe93c2c6a
--- /dev/null
+++ b/275/CH5/EX5.5.53/Ch5_5_53.sce
@@ -0,0 +1,17 @@
+clc

+disp("Example 5.53")

+printf("\n")

+disp("Design the value of L1,L2 & C for a hartley oscillator")

+printf("Given\n")

+//frequency of oscillation

+f=30*10^3

+//then value of LC

+LC=1/(4*(%pi)^2*f^2)

+//select c as

+C=0.1*10^-6

+//Total inductance

+L=LC/C

+//let L1=L2

+L1=L/2

+L2=L1

+printf("The values of L1=\t%f henry\nL2=\t%f henry\nC=\t%e farad\n",L1,L2,C)

diff --git a/275/CH5/EX5.5.55/Ch5_5_55.sce b/275/CH5/EX5.5.55/Ch5_5_55.sce
new file mode 100755
index 000000000..7932ae835
--- /dev/null
+++ b/275/CH5/EX5.5.55/Ch5_5_55.sce
@@ -0,0 +1,15 @@
+clc

+disp("Example 5.55")

+printf("\n")

+disp("calculate the frequency of oscillation of Colpitts oscillator")

+printf("Given\n")

+//capacitor

+C1=400*10^-12

+C2=C1

+//inductance

+L=2*10^-3

+//Total capacitance

+C=C1*C2/(C1+C2)

+//frequency of oscillation

+f=1/(2*%pi*sqrt(L*C))

+printf("frequency of oscillations \n%f hz\n",f)

diff --git a/275/CH5/EX5.5.56/Ch5_5_56.sce b/275/CH5/EX5.5.56/Ch5_5_56.sce
new file mode 100755
index 000000000..bc3506d21
--- /dev/null
+++ b/275/CH5/EX5.5.56/Ch5_5_56.sce
@@ -0,0 +1,19 @@
+clc

+disp("Example 5.56")

+printf("\n")

+disp("calculate the frequency of oscillation,feedback factor & gain required for sustained oscillation")

+printf("Given\n")

+//Capacitance

+C1=40*10^-12

+C2=10*10^-12

+//inductance

+L=3*10^-3

+//total effective capacitance

+C=C1*C2/(C1+C2)

+//frequency of oscillation

+f=1/(2*%pi*sqrt(L*C))

+//feedback factor

+B=C2/C1

+//gain required for sustained oscillation

+Av=C1/C2

+printf("gain required for sustained oscillation =\t>%f\n",Av)

diff --git a/275/CH5/EX5.5.57/Ch5_5_57.sce b/275/CH5/EX5.5.57/Ch5_5_57.sce
new file mode 100755
index 000000000..81cfa9341
--- /dev/null
+++ b/275/CH5/EX5.5.57/Ch5_5_57.sce
@@ -0,0 +1,15 @@
+clc

+disp("Example 5.57")

+printf("\n")

+disp("calculate the value of L of Colpitts oscillator ")

+printf("Given\n")

+//capacitor

+C1=100*10^-12

+C2=60*10^-12

+//total effective capacitance

+C=C1*C2/(C1+C2)

+//frequency of oscillation

+f=40*10^3

+//inductance

+L=1/(4*(%pi)^2*f^2*C)

+printf("inductance value is \n%f henry\n",L)

diff --git a/275/CH5/EX5.5.58/Ch5_5_58.sce b/275/CH5/EX5.5.58/Ch5_5_58.sce
new file mode 100755
index 000000000..861b11428
--- /dev/null
+++ b/275/CH5/EX5.5.58/Ch5_5_58.sce
@@ -0,0 +1,17 @@
+clc

+disp("Example 5.58")

+printf("\n")

+disp("calculate the value of C1 & C2 of Colpitts oscillator")

+printf("Given\n")

+//inductance

+L=5*10^-3

+//frequency of oscillation

+f=50*10^3

+//total effective capacitance

+C=1/(4*(%pi)^2*f^2*L)

+//feedback factor 

+B=0.1

+//then C2/C1=0.1, so substituting in C=C1C2/(C1+C2) we get

+C1=1.1*C/0.1

+C2=0.1*C1

+printf("The value of C1=\t%e farad\nC2=\t%e farad\n",C1,C2)

diff --git a/275/CH5/EX5.5.59/Ch5_5_59.sce b/275/CH5/EX5.5.59/Ch5_5_59.sce
new file mode 100755
index 000000000..bc55b4252
--- /dev/null
+++ b/275/CH5/EX5.5.59/Ch5_5_59.sce
@@ -0,0 +1,16 @@
+clc

+disp("Example 5.59")

+printf("\n")

+disp("calculate the value of L & C for a colpitts oscillator")

+printf("Given\n")

+//frequency of oscillation

+f=40*10^3

+LC=1/(4*(%pi)^2*f^2)

+//select L

+L=10*10^-3

+//find C

+C=1/(4*(%pi)^2*f^2*L)

+//let C1=C2 so we get

+C1=2*C

+C2=C1

+printf("The values of L=\t%f henry\nC1=\t%e farad\nC2=\t%e farad\n",L,C1,C2)

diff --git a/275/CH5/EX5.5.6/Ch5_5_6.sce b/275/CH5/EX5.5.6/Ch5_5_6.sce
new file mode 100755
index 000000000..328e3f523
--- /dev/null
+++ b/275/CH5/EX5.5.6/Ch5_5_6.sce
@@ -0,0 +1,12 @@
+clc

+disp("Example 5.6")

+printf("\n")

+disp("Calculate new level of output voltage when it has fallen by 4db")

+printf("Given\n")

+//output voltage of an amplifier is 2V when frequency 1khz

+V1=2

+//power in db

+Po=-4

+//new level of output voltage

+V2=10^(Po/20)*V1

+printf("new output voltage \n%f volt\n",V2)

diff --git a/275/CH5/EX5.5.61/Ch5_5_61.sce b/275/CH5/EX5.5.61/Ch5_5_61.sce
new file mode 100755
index 000000000..c9fb67518
--- /dev/null
+++ b/275/CH5/EX5.5.61/Ch5_5_61.sce
@@ -0,0 +1,12 @@
+clc

+disp("Example 5.61")

+printf("\n")

+disp("calculate the frequency of oscillation for Wein_Bridge Oscillator")

+printf("Given\n")

+//Resistance

+R=2*10^3

+//capacitor

+C=0.1*10^-6

+//frequency of oscillation

+f=1/(2*%pi*R*C)

+printf("frequecy of oscillation \n%f hz\n",f)

diff --git a/275/CH5/EX5.5.62/Ch5_5_62.sce b/275/CH5/EX5.5.62/Ch5_5_62.sce
new file mode 100755
index 000000000..6765c9b06
--- /dev/null
+++ b/275/CH5/EX5.5.62/Ch5_5_62.sce
@@ -0,0 +1,15 @@
+clc

+disp("Example 5.62")

+printf("\n")

+disp("calculate the value of R & c for Wein-Bridge oscillator")

+printf("Given\n")

+//frequency of oscillation

+f=1000

+//find RC

+RC=1/(2*%pi*f)

+//select C<10^-6F

+C=0.1*10^-6

+//the value of R

+R=1/(2*%pi*f*C)

+printf("the value of c \n%f farad\n",C)

+printf("the value of R \n%f ohm\n",R)

diff --git a/275/CH5/EX5.5.65/Ch5_5_65.sce b/275/CH5/EX5.5.65/Ch5_5_65.sce
new file mode 100755
index 000000000..1f309f5cc
--- /dev/null
+++ b/275/CH5/EX5.5.65/Ch5_5_65.sce
@@ -0,0 +1,20 @@
+clc

+disp("Example 5.65")

+printf("\n")

+disp("calculate the Series & parallel resonant frequencies of Crystal")

+printf("Given\n")

+//indutance

+L=3

+//Capacitor due to mechanical mounting of crystal

+Cm=10*10^-12

+//electrical equivalent capacitance of crystal compliance

+Cs=0.05*10^-12

+//electrical equivalent resistance of crystal structure internal friction

+R=2*10^3

+//series resonant frequency

+fs=1/(2*%pi*sqrt(L*Cs))

+Cp=Cm*Cs/(Cm+Cs)

+//parallel resonant frequency

+fp=1/(2*%pi*sqrt(L*Cp))

+printf("series resonant frequency \n%f hz\n",fs)

+printf("parallel resonant frequency \n%f hz\n",fp)