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diff --git a/2300/CH9/EX9.12.1/Ex9_1.sce b/2300/CH9/EX9.12.1/Ex9_1.sce
new file mode 100755
index 000000000..af0fe3e9d
--- /dev/null
+++ b/2300/CH9/EX9.12.1/Ex9_1.sce
@@ -0,0 +1,18 @@
+//scilab 5.4.1

+//Windows 7 operating system

+//chapter 9 Basic Voltage and Power Amplifiers

+clc

+clear

+AVm=120//AVm=mid-band gain of an RC-coupled amplifier

+fm=100//fm=frequency in Hz corresponding to the mid-band gain

+AVl=60//AVl=reduced gain

+AVh=AVl

+f=100*10^3//f=frequency in Hz corresponding to the reduced gain

+//|AVl|=(|AVm|)/sqrt(1+(fl/fm)^2) where fl=lower half power frequency

+fl=sqrt((abs(AVm)/abs(AVl))^2 -1)*fm

+format("v",6)

+disp("Hz",fl,"The lower half-power frequency is =")

+//|AVh|=(|AVm|)/sqrt(1+(f/fh)^2) where fh=upper half power frequency

+fh=f/sqrt((abs(AVm)/abs(AVh))^2 -1)

+format("v",5)

+disp("kHz",fh/10^3,"The upper half-power frequency is =")//fh is converted in terms of kHz

diff --git a/2300/CH9/EX9.12.2/Ex9_2.sce b/2300/CH9/EX9.12.2/Ex9_2.sce
new file mode 100755
index 000000000..6094dbf0d
--- /dev/null
+++ b/2300/CH9/EX9.12.2/Ex9_2.sce
@@ -0,0 +1,22 @@
+//scilab 5.4.1

+//Windows 7 operating system

+//chapter 9 Basic Voltage and Power Amplifiers

+clc

+clear

+//For two identical transistors employed by an RC-coupled amplifier

+hfe=100//hfe=current gain

+hie=2*10^3//hie=input impedance in ohm

+Cob=2*10^-12//Cob=capacitance in farad quoted by the transistor manufacturers

+C=0.4*10^-6//C=coupling capacitance in farad

+RL=8*10^3//RL=load resistance in ohms for each transistor

+CW=10*10^-12//CW=wiring capacitance in farad

+fl=1/(2*%pi*C*(hie+RL))//fl=lower half power frequency

+format("v",5)

+disp("Hz",fl,"The lower half-power frequency is =")

+hfb=-hfe/(1+hfe)//hfb=current gain for common base transistor

+Coc=Cob/(1+hfb)//Coc=transistor collector capacitance in farad

+Cs=Coc+CW//Cs=shunt capacitance in farad

+Ro=(hie*RL)/(hie+RL)//Ro=equivalent resistance of the parallel combination of hie and RL

+fh=1/(2*%pi*Cs*Ro)//fh=upper half power frequency

+format("v",5)

+disp("kHz",fh/10^3,"The upper half-power frequency is =")//fh is converted in terms of kHz

diff --git a/2300/CH9/EX9.12.3/Ex9_3.sce b/2300/CH9/EX9.12.3/Ex9_3.sce
new file mode 100755
index 000000000..7ee178b02
--- /dev/null
+++ b/2300/CH9/EX9.12.3/Ex9_3.sce
@@ -0,0 +1,33 @@
+//scilab 5.4.1

+//Windows 7 operating system

+//chapter 9 Basic Voltage and Power Amplifiers

+clc

+clear

+//AVm=mid-band gain of an RC-coupled amplifier

+fm=60//fm=frequency in Hz corresponding to the mid-band gain

+//AVl=reduced gain

+//AVh=AVl

+f=600*10^3//f=frequency in Hz corresponding to the reduced gain

+fl=30//fl=The lower half-power frequency in Hz

+fh=300*10^3//fh=The upper half-power frequency in Hz

+//|AVl|=(|AVm|)/sqrt(1+(fl/fm)^2)

+//Suppose (AVl/AVm)=a=low frequency gain with respect to the mid frequency gain

+//a=1/sqrt(1+(fl/fm)^2)//a=magnitude of the low frequency gain

+a=1/sqrt(1+(fl/fm)^2)

+format("v",5)

+o=atand(fl/fm)//o=phase angle in degree of the low frequency gain

+format("v",5)

+disp("For the low frequency gain with respect to the mid frequency gain ")

+disp(a,"Magnitude=")

+disp("degree",o,"Phase angle=")

+//|AVh|=(|AVm|)/sqrt(1+(f/fh)^2)

+//Suppose (AVh/AVm)=b=high frequency gain with respect to the mid frequency gain

+//b=1/sqrt(1+(f/fh)^2)//b=magnitude of the high frequency gain

+b=1/sqrt(1+(f/fh)^2)

+format("v",6)

+O=-atand(f/fh)//O=phase angle in degree of the high frequency gain

+format("v",6)

+disp("For the high frequency gain with respect to the mid frequency gain ")

+disp(b,"Magnitude=")

+disp("degree",O,"Phase angle=")

+

diff --git a/2300/CH9/EX9.12.4/Ex9_4.sce b/2300/CH9/EX9.12.4/Ex9_4.sce
new file mode 100755
index 000000000..84b354714
--- /dev/null
+++ b/2300/CH9/EX9.12.4/Ex9_4.sce
@@ -0,0 +1,15 @@
+//scilab 5.4.1

+//Windows 7 operating system

+//chapter 9 Basic Voltage and Power Amplifiers

+clc

+clear

+//In a CE class A power amplifier

+RL=12//RL=load resistance in ohms

+n=8//n=primary-to-secondary turns ratio of a transformer

+//Peak-to-peak swing of the signal current is 250mA

+Im=(250*10^-3)/2//Im=ac collector current in Ampere

+RL1=(n^2)*RL//RL1=RL'=resistance reflected to the primary for the resistance RL in presence of an ac signal

+//Pac=(1/2)*Vm*Im where Pac=ac output power

+//Pac=(1/2)*(Im^2)*RL1

+Pac=(1/2)*(Im^2)*RL1

+disp("W",Pac,"The output power is =")

diff --git a/2300/CH9/EX9.12.5/Ex9_5.sce b/2300/CH9/EX9.12.5/Ex9_5.sce
new file mode 100755
index 000000000..aef21cb55
--- /dev/null
+++ b/2300/CH9/EX9.12.5/Ex9_5.sce
@@ -0,0 +1,20 @@
+//scilab 5.4.1

+//Windows 7 operating system

+//chapter 9 Basic Voltage and Power Amplifiers

+clc

+clear

+VCQ=6//VCQ=quiescent collector voltage

+ICQ=50*10^-3//ICQ=quiescent collector current

+VCmin=1

+VCmax=11//VCmin,VCmax=output signal voltage variation

+ICmin=10*10^-3

+ICmax=90*10^-3//ICmin,ICmax=output signal current variation in Ampere

+Ps=VCQ*ICQ//Ps=dc input power to the transistor

+disp("W",Ps,"The dc input power is =")

+Pac=(1/8)*(ICmax-ICmin)*(VCmax-VCmin)//Pac=ac output power delivered to the load

+disp("W",Pac,"The ac output power is =")

+PT=(VCQ*ICQ)-Pac//PT=the collector dissipation

+disp("W",PT,"The collector dissipation is =")

+n=(Pac/Ps)*100//n=the efficiency of the active device

+format("v",5)

+disp("%",n,"The efficiency is =")

diff --git a/2300/CH9/EX9.12.6/Ex9_6.sce b/2300/CH9/EX9.12.6/Ex9_6.sce
new file mode 100755
index 000000000..1d47fcb8c
--- /dev/null
+++ b/2300/CH9/EX9.12.6/Ex9_6.sce
@@ -0,0 +1,20 @@
+//scilab 5.4.1

+//Windows 7 operating system

+//chapter 9 Basic Voltage and Power Amplifiers

+clc

+clear

+//In a class B push pull circuit

+//Transformer winding resistances are to be ignored

+n=3//n=primary-to-secondary turns ratio of a transformer

+RL=9//RL=load resistance in ohms

+VCC=15//VCC=collector supply voltage

+RL1=((n/2)^2)*RL//RL1=reflected load resistance for one transistor

+Pactot=(VCC^2)/(2*RL1)//Pactot=maximum output power

+format("v",5)

+disp("W",Pactot,"The maximum output power is =")

+Pstot=(2*VCC^2)/(%pi*RL1)//Pstot=the maximum dc power supplied to the two transistors

+format("v",5)

+disp("W",Pstot,"The maximum dc power supplied is =")

+n=(Pactot/Pstot)*100//n=efficiency

+format("v",5)

+disp("%",n,"The efficiency is =")

diff --git a/2300/CH9/EX9.12.7/Ex9_7.sce b/2300/CH9/EX9.12.7/Ex9_7.sce
new file mode 100755
index 000000000..9c5dfcf88
--- /dev/null
+++ b/2300/CH9/EX9.12.7/Ex9_7.sce
@@ -0,0 +1,26 @@
+//scilab 5.4.1

+//Windows 7 operating system

+//chapter 9 Basic Voltage and Power Amplifiers

+clc

+clear

+//In a single tuned amplifier

+L=120*10^-6//L=inductance in henry

+C=100*10^-12//C=capacitance in farad

+R=10//R=resistance in ohms

+hoe=50*10^-6//hoe=output impedance in mho(or S)

+hfe=100//hfe=current gain

+hie=2.5*10^3//hie=input impedance in ohm

+RT=10*10^3//RT=equivalent resistance of RB and Ri in parallel

+fo=1/(2*%pi*sqrt(L*C))//fo=resonant frequency

+format("v",5)

+disp("MHz",fo/10^6,"The resonant frequency is =")//fo is converted in terms of MHz

+Qo=(1/R)*sqrt(L/C)//Qo=Q-factor of the resonant frequency

+Ro=(Qo^2)*R//Ro=maximum impedance Zm

+Rp=1/(hoe+(1/Ro)+(1/RT))//Rp=equivalent resistance of the parallel combination of Ro,ro and RT

+Qe=(Qo*Rp)/Ro//Qe=effective Q-factor

+B=fo/Qe//B=bandwidth

+format("v",6)

+disp("kHz",B/10^3,"The bandwidth is =")//B is converted in terms of kHz

+AVm=-(hfe*Rp)/hie//AVm=maximum voltage gain

+format("v",6)

+disp(AVm,"The maximum voltage gain is =")

diff --git a/2300/CH9/EX9.12.8/Ex9_8.sce b/2300/CH9/EX9.12.8/Ex9_8.sce
new file mode 100755
index 000000000..053488844
--- /dev/null
+++ b/2300/CH9/EX9.12.8/Ex9_8.sce
@@ -0,0 +1,14 @@
+//scilab 5.4.1

+//Windows 7 operating system

+//chapter 9 Basic Voltage and Power Amplifiers

+clc

+clear

+V=10//V=voltage at frequency 5kHz

+Vr=7.07//Vr=voltage at frequency 25kHz

+//x=10*log10(P/Pr) where x=change in decibel(dB) of power P from some standard power Pr

+//P=V^2/R=I^2*R 

+//Also Pr=Vr^2/R=Ir^2*R

+//x=10*(log10(V/Vr))^2=20*log10(V/Vr)

+x=20*log10(V/Vr)//x=change in decibel(dB) of voltage V from some standard voltage Vr

+format("v",4)

+disp("dB",x,"The decibel change in the output power level is =")

diff --git a/2300/CH9/EX9.12.9/Ex9_9.sce b/2300/CH9/EX9.12.9/Ex9_9.sce
new file mode 100755
index 000000000..50130ecba
--- /dev/null
+++ b/2300/CH9/EX9.12.9/Ex9_9.sce
@@ -0,0 +1,22 @@
+//scilab 5.4.1

+//Windows 7 operating system

+//chapter 9 Basic Voltage and Power Amplifiers

+clc

+clear

+Vorms=2//Vorms=rms output voltage in the midband region of an amplifier

+Pa=42//Pa=power gain in dB

+Pol=0.4//Pol=power output in W at the lower cut-off frequency 100Hz

+Ri=10^3//Ri=input resistance in ohms

+VOrms=2/sqrt(2)//VOrms=rms output voltage at 100Hz

+format("v",6)

+disp("V",VOrms,"1. The rms output voltage at 100Hz,which is the lower cutoff frequency,is =")

+Po=2*Pol//Po=output power in the midband region

+disp("W",Po,"2. The output power in the midband region is =")

+//Let Pi=input power

+//10*log10(Po/Pi)=Pa

+Pi=Po/(10^(Pa/10))

+//Pi=(Vi^2)/Ri where Vi=rms input voltage

+Vi=sqrt(Pi*Ri)

+format("v",7)

+disp("V",Vi,"3. The rms input voltage is =")

+