From b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b Mon Sep 17 00:00:00 2001
From: priyanka
Date: Wed, 24 Jun 2015 15:03:17 +0530
Subject: initial commit / add all books

---
 226/CH12/EX12.1/example1_sce.sce   | 15 +++++++++++++++
 226/CH12/EX12.10/example10_sce.sce | 10 ++++++++++
 226/CH12/EX12.11/example11_sce.sce | 23 +++++++++++++++++++++++
 226/CH12/EX12.12/example12_sce.sce | 17 +++++++++++++++++
 226/CH12/EX12.13/example13_sce.sce | 13 +++++++++++++
 226/CH12/EX12.14/example14_sce.sce | 28 ++++++++++++++++++++++++++++
 226/CH12/EX12.15/example15_sce.sce | 23 +++++++++++++++++++++++
 226/CH12/EX12.16/example16_sce.sce | 16 ++++++++++++++++
 226/CH12/EX12.17/example17_sce.sce | 11 +++++++++++
 226/CH12/EX12.18/example18_sce.sce | 14 ++++++++++++++
 226/CH12/EX12.19/example19_sce.sce | 14 ++++++++++++++
 226/CH12/EX12.2/example2_sce.sce   | 14 ++++++++++++++
 226/CH12/EX12.20/example20_sce.sce | 19 +++++++++++++++++++
 226/CH12/EX12.21/example21_sce.sce | 11 +++++++++++
 226/CH12/EX12.22/example22_sce.sce | 19 +++++++++++++++++++
 226/CH12/EX12.23/example23_sce.sce | 17 +++++++++++++++++
 226/CH12/EX12.24/example24_sce.sce | 18 ++++++++++++++++++
 226/CH12/EX12.3/example3_sce.sce   | 13 +++++++++++++
 226/CH12/EX12.4/example5_sce.sce   | 11 +++++++++++
 226/CH12/EX12.5/example5_sce.sce   | 11 +++++++++++
 226/CH12/EX12.7/example7_sce.sce   | 11 +++++++++++
 226/CH12/EX12.8/example8_sce.sce   | 28 ++++++++++++++++++++++++++++
 226/CH12/EX12.9/example9_sce.sce   | 16 ++++++++++++++++
 23 files changed, 372 insertions(+)
 create mode 100755 226/CH12/EX12.1/example1_sce.sce
 create mode 100755 226/CH12/EX12.10/example10_sce.sce
 create mode 100755 226/CH12/EX12.11/example11_sce.sce
 create mode 100755 226/CH12/EX12.12/example12_sce.sce
 create mode 100755 226/CH12/EX12.13/example13_sce.sce
 create mode 100755 226/CH12/EX12.14/example14_sce.sce
 create mode 100755 226/CH12/EX12.15/example15_sce.sce
 create mode 100755 226/CH12/EX12.16/example16_sce.sce
 create mode 100755 226/CH12/EX12.17/example17_sce.sce
 create mode 100755 226/CH12/EX12.18/example18_sce.sce
 create mode 100755 226/CH12/EX12.19/example19_sce.sce
 create mode 100755 226/CH12/EX12.2/example2_sce.sce
 create mode 100755 226/CH12/EX12.20/example20_sce.sce
 create mode 100755 226/CH12/EX12.21/example21_sce.sce
 create mode 100755 226/CH12/EX12.22/example22_sce.sce
 create mode 100755 226/CH12/EX12.23/example23_sce.sce
 create mode 100755 226/CH12/EX12.24/example24_sce.sce
 create mode 100755 226/CH12/EX12.3/example3_sce.sce
 create mode 100755 226/CH12/EX12.4/example5_sce.sce
 create mode 100755 226/CH12/EX12.5/example5_sce.sce
 create mode 100755 226/CH12/EX12.7/example7_sce.sce
 create mode 100755 226/CH12/EX12.8/example8_sce.sce
 create mode 100755 226/CH12/EX12.9/example9_sce.sce

(limited to '226/CH12')

diff --git a/226/CH12/EX12.1/example1_sce.sce b/226/CH12/EX12.1/example1_sce.sce
new file mode 100755
index 000000000..bc9d845d5
--- /dev/null
+++ b/226/CH12/EX12.1/example1_sce.sce
@@ -0,0 +1,15 @@
+//chapter 12
+//example 12.1
+//page 474
+printf("\n")
+printf("given")
+hfe=50;hie=1*10^3;hib=20;f1=100;Rc=3.3*10^3;Re=Rc;
+disp(" required capacitance")
+Xc2=hib;
+C2=1/(2*3.14*f1*Xc2)
+disp(" voltage gain with emitter terminal completely bypassed to ground")
+Av=-(hfe*Rc)/hie
+disp("voltage gain  when f=100")
+Av=-(hfe*Rc)/sqrt(((hie^2)+((1+hfe)*Xc2)^2))
+disp(" voltage gain when C2 is incorrectly selected as Xc2=Re/10")
+Avx=-(hfe*Rc)/sqrt(((hie^2)+((1+hfe)*(Re/10))^2))
\ No newline at end of file
diff --git a/226/CH12/EX12.10/example10_sce.sce b/226/CH12/EX12.10/example10_sce.sce
new file mode 100755
index 000000000..cb2e77fdf
--- /dev/null
+++ b/226/CH12/EX12.10/example10_sce.sce
@@ -0,0 +1,10 @@
+//chapter 12
+//example 12.10
+//page 494
+printf("\n")
+printf("given")
+hfe=50;hie=1.3*10^3;R3=5.6*10^3;R5=3.9*10^3;Rl=40*10^3;
+Av1=-(hfe*((R3*hie)/(R3+hie)))/hie
+Av2=-(hfe*((R5*Rl)/(R5+Rl)))/hie
+disp(" overall voltage gain is Av=Av1*Av2")
+Av=Av1*Av2
\ No newline at end of file
diff --git a/226/CH12/EX12.11/example11_sce.sce b/226/CH12/EX12.11/example11_sce.sce
new file mode 100755
index 000000000..af2d47651
--- /dev/null
+++ b/226/CH12/EX12.11/example11_sce.sce
@@ -0,0 +1,23 @@
+//chapter 12
+//example 12.11
+//page 497
+printf("\n")
+printf("given")
+Vp=100*10^-3;Rl=100;Vbe=.7;Vcc=20;
+ip=Vp/Rl
+disp("select Ie2>ip")
+Ie2=2*10^-3;
+Ve1=5;Vce1=3;
+Vb2=Ve1+Vce1
+Vc1=Vb2;
+Ve2=Vb2-Vbe
+R5=Ve2/Ie2//use 3.3Kohm standard value
+R5=3.3*10^3;
+Ic1=1*10^-3;
+Vr3=Vcc-Vb2
+R3=Vr3/Ic1
+R4=Ve1/Ic1//use 4.7Kohm standard value
+R4=4.7*10^3;
+Vb1=Ic1*R4+Vbe
+R2=10*R4
+R1=((Vcc-Vb1)*R2)/Vr2
\ No newline at end of file
diff --git a/226/CH12/EX12.12/example12_sce.sce b/226/CH12/EX12.12/example12_sce.sce
new file mode 100755
index 000000000..22c88dc9e
--- /dev/null
+++ b/226/CH12/EX12.12/example12_sce.sce
@@ -0,0 +1,17 @@
+//chapter 12
+//example 12.11
+//page 498
+printf("\n")
+printf("given")
+rs=600;Ie1=1*10^-3;hfe=50;R1=120*10^3;R2=47*10^3;f1=150;Ie2=2*10^-3;R5=3.3*10^3;R3=12*10^3;Rl=100;
+re=26*10^-3/Ie1
+hie=(1+hfe)*re
+Zi=(R1*R2*hie)/(R1*R2+R1*hie+R2*hie)
+Xc1=(Zi+rs)/10
+C1=1/(2*3.14*f1*Xc1)//use 6*10^-6 as standard value
+Xc2=.65*re
+C2=1/(2*3.14*f1*Xc2)
+re2=26*10^-3/Ie2
+Zo=(R5*(re2+R3/hfe))/(R5+(re2+R3/hfe))
+Xc3=.65*(Rl+Zo)
+C3=1/(2*3.14*f1*Xc3)
\ No newline at end of file
diff --git a/226/CH12/EX12.13/example13_sce.sce b/226/CH12/EX12.13/example13_sce.sce
new file mode 100755
index 000000000..cf6c9e47f
--- /dev/null
+++ b/226/CH12/EX12.13/example13_sce.sce
@@ -0,0 +1,13 @@
+//chapter 12
+//example 12.13
+//page 499
+printf("\n")
+printf("given")
+Ie2=2*10^-3;hfe=50;R5=3.3*10^3;Rl=100;hfc2=51;R3=12*10^3;
+re=26*10^-3/Ie2
+hic=hfe*re
+Zi2=hic+hfc2*((Rl*R5)/(Rl+R5))
+Av1=-(hfe*((R3*Zi2)/(R3+Zi2)))/hie
+Av2=1
+disp("overall voltage gain is Av=Av1*Av2")
+Av=Av1*Av2
\ No newline at end of file
diff --git a/226/CH12/EX12.14/example14_sce.sce b/226/CH12/EX12.14/example14_sce.sce
new file mode 100755
index 000000000..bb30066fe
--- /dev/null
+++ b/226/CH12/EX12.14/example14_sce.sce
@@ -0,0 +1,28 @@
+//chapter 12
+//example 12.14
+//page 503
+printf("\n")
+printf("given")
+vp=50*10^-3;Rl=50;Ve2=5;Vcc=12;Vbe=.7;hFE=70;hfe=100;R2=120*10^3;f1=150;R3=150*10^3;R1=5.6*10^3;R4=2.2*10^3;
+ip=vp/Rl
+disp("select Ie2>ip")
+Ie2=2*10^-3;
+R4=Ve2/Ie2//use standard 2.2Kohm
+R4=2.2*10^3;
+Ie2=Ve2/R4
+Ic1=1*10^-3;
+Vr1=Vcc-(Vbe+Ve2)
+R1=Vr1/Ic1//use 5.6kohm and recalculate
+R1=5.6*10^3;
+Ic1=Vr1/R1
+Ib1=Ic1/hFE
+hie=hfe*(26*10^-3/Ic1)
+hie2=hfe*((26*10^-3)/(2.27*10^-3))
+Zi1=(R2*hie)/(R2+hie)
+Xc1=Zi1/10
+C1=1/(2*3.14*f1*Xc1)
+Xc2=R3/100
+C2=1/(2*3.14*f1*Xc2)
+Zo=(((hie2+R1)/hfe)*R4)/(((hie2+R1)/hfe)+R4)
+Xc3=Rl+Zo
+C3=1/(2*3.14*f1*Xc3)
\ No newline at end of file
diff --git a/226/CH12/EX12.15/example15_sce.sce b/226/CH12/EX12.15/example15_sce.sce
new file mode 100755
index 000000000..d971e3c09
--- /dev/null
+++ b/226/CH12/EX12.15/example15_sce.sce
@@ -0,0 +1,23 @@
+//chapter 12
+//example 12.15
+//page 407
+printf("\n")
+printf("given")
+Vgsoff=-6;Idss=20*10^-3;Yfs=4000*10^-6;Id=2*10^-3;Vcc=20;Zi=500*10^3;R2=560*10^3;Rl=80*10^3;Vbe=.7;Vce=3;
+Vgs=Vgsoff*(1-sqrt(Id/Idss))
+Vds=(-Vgsoff)+1-(-Vgs)
+Vr3=(Vcc-Vds)/2
+Vr4=Vr3;
+R3=Vr4/Id//use 3.9kohm as standard and recalculate Vr3 and Vr4
+R4=R3;
+R4=3.9*10^3;
+Vr3=Id*R4
+Vr4=Vr3;
+Vr2=Vr4-(-Vgs)
+Vr1=Vcc-Vr2
+R1=(Vr1*R2)/Vr2
+R6=Rl/10
+Vr5=Vr3-Vbe
+Vr6=Vcc-Vr5-Vce
+Ic2=Vr6/R6
+R5=Vr5/Ic2
\ No newline at end of file
diff --git a/226/CH12/EX12.16/example16_sce.sce b/226/CH12/EX12.16/example16_sce.sce
new file mode 100755
index 000000000..671209a40
--- /dev/null
+++ b/226/CH12/EX12.16/example16_sce.sce
@@ -0,0 +1,16 @@
+//chapter 12
+//example 12.16
+//page 508
+printf("\n")
+printf("given")
+R1=2.7*10^6;R2=560*10^3;f1=150;Yfs=8000*10^-6;Ie=1.2*10^-3;Rl=80*10^3;R6=8.2*10^3;
+Zi=(R1*R2)/(R1+R2)
+Xc1=Zi/10
+C1=1/(2*3.14*f1*Xc1)
+Xc2=.65/Yfs
+C2=1/(2*3.14*f1*Xc2)//use 15pF as standard value
+re=26*10^-3/Ie
+Xc3=.65*re
+C3=1/(2*3.14*f1*Xc3)
+Xc4=(R6+Rl)/10
+C4=1/(2*3.14*f1*Xc4)
\ No newline at end of file
diff --git a/226/CH12/EX12.17/example17_sce.sce b/226/CH12/EX12.17/example17_sce.sce
new file mode 100755
index 000000000..1caa591d5
--- /dev/null
+++ b/226/CH12/EX12.17/example17_sce.sce
@@ -0,0 +1,11 @@
+//chapter 12
+//example 12.17
+//page 509
+printf("\n")
+printf("given")
+re=22;hfe=100;R3=3.9*10^3;Yfs=4000*10^-6;R6=8.2*10^3;Rl=80*10^3;
+Zi2=hfe*re
+Av1=-Yfs*((R3*Zi2)/(R3+Zi2))
+Av2=-(hfe*((R6*Rl)/(R6+Rl)))/Zi2
+disp("overall voltage is Av=Av1*Av2")
+Av=Av1*Av2
\ No newline at end of file
diff --git a/226/CH12/EX12.18/example18_sce.sce b/226/CH12/EX12.18/example18_sce.sce
new file mode 100755
index 000000000..cbeb0d6a4
--- /dev/null
+++ b/226/CH12/EX12.18/example18_sce.sce
@@ -0,0 +1,14 @@
+//chapter 12
+//example 12.18
+//page 516
+printf("\n")
+printf("given")
+hFE=60;hfe=60;hie=1.4*10^3;Rl=70*10^3;Vce=3;Vbe=.7;Vcc=10;
+Rc2=Rl/10//use 6.8Kohm as standard value
+Vrc2=Vcc+Vbe-Vce
+Ic=Vrc2/Rc2
+Ie=Ic;
+Re=(Vcc-Vbe)/(2*Ie)//use 4.7 as standard value
+Re=4.7*10^3;
+Rb=Vbe/(10*(Ic/hFE))
+Rb1=Rb;
\ No newline at end of file
diff --git a/226/CH12/EX12.19/example19_sce.sce b/226/CH12/EX12.19/example19_sce.sce
new file mode 100755
index 000000000..ea8b6c87b
--- /dev/null
+++ b/226/CH12/EX12.19/example19_sce.sce
@@ -0,0 +1,14 @@
+//chapter 12
+//example 12.19
+//page 517
+printf("\n")
+printf("given")
+f1=60;Ie=1.13*10^-3;hfe=60;Rb=3.9*10^3;Rl=70*10^3;Rc=6.8*10^3;
+re=26*10^-3/Ie//use 20 as standard value
+re=20;
+hie=hfe*re
+Zb=2*hie
+Zi=(Rb*Zb)/(Rb+Zb)
+C1=1/(2*3.14*f1*Zi)
+C2=1/(2*3.14*f1*(Rl/10))
+Av=(hfe*((Rc*Rl)/(Rc+Rl)))/(2*hie)
\ No newline at end of file
diff --git a/226/CH12/EX12.2/example2_sce.sce b/226/CH12/EX12.2/example2_sce.sce
new file mode 100755
index 000000000..f7f97675a
--- /dev/null
+++ b/226/CH12/EX12.2/example2_sce.sce
@@ -0,0 +1,14 @@
+//chapter 12
+//example 12.2
+//page 477
+printf("\n")
+printf("given")
+Vcc=24;Ve=5;Vce=3;Rl=120*10^3;Vbe=.7
+Rc=Rl/10
+Vrc=Vcc-Vce-Ve
+Ic=Vrc/Rc
+Re=Ve/Ic//use 3.9Kohm standard value to make Ic littel less than design level
+Re=3.9*10^3;
+R2=10*Re
+I2=(Ve+Vbe)/R2
+R1=(Vcc-Ve-Vbe)/I2
\ No newline at end of file
diff --git a/226/CH12/EX12.20/example20_sce.sce b/226/CH12/EX12.20/example20_sce.sce
new file mode 100755
index 000000000..ef19ab8b4
--- /dev/null
+++ b/226/CH12/EX12.20/example20_sce.sce
@@ -0,0 +1,19 @@
+//chapter 12
+//example 12.20
+//page 521
+printf("\n")
+printf("given")
+Vcc=20;Rl=90*10^3;hfe=50;hie=1.2*10^3;hib=24;Vce=3;Vce1=Vce;Ve=5;Vbe=.7;
+Rc=Rl/10//use 8.2kohm as standard value
+Rc=8.2*10^3;
+Vrc=Vcc-Vce-Vce1-Ve
+Ic=Vrc/Rc
+Re=Ve/Ic
+Re=4.7*10^3;//use 4.7 as standard value
+R3=10*Re
+Vb1=Ve+Vbe
+I3=Vb1/R3
+Vb2=Ve+Vce+Vbe
+Vr2=Vb2-Vb1
+R2=Vr2/I3
+R1=(Vcc-Vb2)/I3
\ No newline at end of file
diff --git a/226/CH12/EX12.21/example21_sce.sce b/226/CH12/EX12.21/example21_sce.sce
new file mode 100755
index 000000000..4b1040495
--- /dev/null
+++ b/226/CH12/EX12.21/example21_sce.sce
@@ -0,0 +1,11 @@
+//chapter 12
+//example 12.21
+//page 522
+printf("\n")
+printf("given")
+f1=25;R2=24.7*10^3;R3=47*10^3;hie=1.2*10^3;hib=24;Rc=9*10^3;Rl=90*10^3;
+Zi=(R2*R3*hie)/(R2*R3+R2*hie+R3*hie)
+C1=1/(2*3.14*f1*(Zi/10))
+C2=1/(2*3.14*f1*(hie/10))
+C3=1/(2*3.14*f1*hib)
+C4=1/(2*3.14*f1*((Rc+Rl)/10))
\ No newline at end of file
diff --git a/226/CH12/EX12.22/example22_sce.sce b/226/CH12/EX12.22/example22_sce.sce
new file mode 100755
index 000000000..f7e9b73c9
--- /dev/null
+++ b/226/CH12/EX12.22/example22_sce.sce
@@ -0,0 +1,19 @@
+//chapter 12
+//example 12.22
+//page 525
+printf("\n")
+printf("given")
+hie=1*10^3;hfe=50;hoe=10*10^-6;Cc=5*10^-12;Cp=330*10^-12;Lp=75*10^-6;Rw=1;Rl=5*10^3;hfb=50;fo=1*10^6;
+fo=1/(2*3.14*sqrt(Lp*(Cp+Cc)))
+printf("resonance frequency is %3fHz\n",fo)
+Zp=Lp/((Cp+Cc)*Rw)
+Rc=1/hoe
+RL=(Zp*Rc*Rl)/(Rl*Rc+Rc*Zp+Rl*Zp);
+RL=4.7*10^3;//as standard value
+Av=(hfb*RL)/hie;
+printf(" voltage gain is %d\n",Av)
+Qp=((Rc*Rl)/(Rc+Rl))/(2*3.14*fo*Lp)
+QL=(2*3.14*fo*Lp)/Rw
+disp("since QL>Qp")
+B=fo/Qp;
+printf("bandwidth is %dHz\n",B)
diff --git a/226/CH12/EX12.23/example23_sce.sce b/226/CH12/EX12.23/example23_sce.sce
new file mode 100755
index 000000000..d673d3aef
--- /dev/null
+++ b/226/CH12/EX12.23/example23_sce.sce
@@ -0,0 +1,17 @@
+//chapter 12
+//example 12.23
+//page 528
+printf("\n")
+printf("given")
+hie=1*10^3;hfe=50;hoe=10*10^-6;Cc=5*10^-12;Cp=330*10^-12;Lp=75*10^-6;Rw=1;Rl=5*10^3;fo=1*10^6;zP=224*10^3;rC=100*10^3;K=.015;Ls=50*10^-6;
+RL=(Zp*Rc)/(Rc+Zp)
+disp("voltage gain from the input to the primary memory winding")
+Avp=(hfe*RL)/hie
+Vsp=K*sqrt(Ls/Lp)
+disp("overall voltage gain from the input to teh secondary winding")
+Av=Avp*Vsp
+Qp=Rc/(2*3.14*fo*Lp)
+Ql=471;
+Q=(Ql*Qp)/(Ql+Qp)
+B=fo/Q;
+printf("bandwidth is %dHz\n",B)
\ No newline at end of file
diff --git a/226/CH12/EX12.24/example24_sce.sce b/226/CH12/EX12.24/example24_sce.sce
new file mode 100755
index 000000000..ca1c93c10
--- /dev/null
+++ b/226/CH12/EX12.24/example24_sce.sce
@@ -0,0 +1,18 @@
+//chapter 12
+//example 12.24
+//page 530
+printf("\n")
+printf("given")
+f=1*10^6;L2=50*10^-6;K=.015;L1=75*10^-6;rs=5;Rw=1;Lp=100*10^-6;Cp=330*10^-12;Cc=5*10^-12;Rc=100*10^3;hfe=50;hie=1*10^3;
+C2=1/(((2*3.14*f)^2)*L2)
+M=K*sqrt(L1*L2)
+Rs=(((2*3.14*f)^2)*(M)^2)/rs
+Rp=Rs+Rw
+Zp=Lp/((Cp+Cc)*Rp)
+Rl=(Zp*Rc)/(Zp+Rc)
+disp("voltage gain from the input to primary winding")
+Avp=(hfe*Rl)/hie
+Vsp=12.2*10^-3;
+Vos=((2*3.14*f)*L2)/rs
+disp("overall voltage gain from the input to secondary winding ")
+Av=Avp*Vos*Vsp
\ No newline at end of file
diff --git a/226/CH12/EX12.3/example3_sce.sce b/226/CH12/EX12.3/example3_sce.sce
new file mode 100755
index 000000000..5e76fd2e3
--- /dev/null
+++ b/226/CH12/EX12.3/example3_sce.sce
@@ -0,0 +1,13 @@
+//chapter 12
+//example 12.3
+//page 477
+printf("\n")
+printf("given")
+hfe=100;Ie=1.3*10^-3;f1=100;R1=120*10^3;R2=39*10^3;rs=600;Rl=R1;
+re=(26*10^-3)/Ie
+Xc2=re;
+C2=1/(2*3.14*f1*Xc2)
+hie=(1+hfe)*re
+Zi=(R1*R2*hie)/(R1*R2+R1*hie+R2*hie)
+C1=1/((2*3.14*f1*((Zi+rs)/10)))
+C3=1/(2*3.14*f1*((Rc+Rl)/10))
\ No newline at end of file
diff --git a/226/CH12/EX12.4/example5_sce.sce b/226/CH12/EX12.4/example5_sce.sce
new file mode 100755
index 000000000..fe82e40db
--- /dev/null
+++ b/226/CH12/EX12.4/example5_sce.sce
@@ -0,0 +1,11 @@
+//chapter 12
+//example 12.5
+//page 485
+printf("\n")
+printf("given")
+rs=600;f1=100;Yfs=6000*10^-6;R1=4.7*10^6;R2=1*10^6;Rd=6.8*10^3;Rl=120*10^3;
+Xc2=1/Yfs
+C2=1/(2*3.14*f1*Xc2)
+Zi=(R1*R2)/(R1+R2)
+C1=1/(2*3.14*f1*(Zi+rs)/10)
+C3=1/(2*3.14*f1*(Rd+Rl)/10)
\ No newline at end of file
diff --git a/226/CH12/EX12.5/example5_sce.sce b/226/CH12/EX12.5/example5_sce.sce
new file mode 100755
index 000000000..fe82e40db
--- /dev/null
+++ b/226/CH12/EX12.5/example5_sce.sce
@@ -0,0 +1,11 @@
+//chapter 12
+//example 12.5
+//page 485
+printf("\n")
+printf("given")
+rs=600;f1=100;Yfs=6000*10^-6;R1=4.7*10^6;R2=1*10^6;Rd=6.8*10^3;Rl=120*10^3;
+Xc2=1/Yfs
+C2=1/(2*3.14*f1*Xc2)
+Zi=(R1*R2)/(R1+R2)
+C1=1/(2*3.14*f1*(Zi+rs)/10)
+C3=1/(2*3.14*f1*(Rd+Rl)/10)
\ No newline at end of file
diff --git a/226/CH12/EX12.7/example7_sce.sce b/226/CH12/EX12.7/example7_sce.sce
new file mode 100755
index 000000000..cf5a298fe
--- /dev/null
+++ b/226/CH12/EX12.7/example7_sce.sce
@@ -0,0 +1,11 @@
+//chapter 12
+//example 12.7
+//page 489
+printf("\n")
+printf("given")
+R1=120*10^3;R2=39*10^3;hie=2*10^3;R7=12*10^3;Zo=R7;R5=R1;R6=R2;hfe=100;R3=R7;Zl=R1;
+Zi=(R1*R2*hie)/(R1*R2+R1*hie+R2*hie)
+Zi2=(R1*R2*hie)/(R1*R2+R1*hie+R2*hie)
+Av1=-(hfe*((R3*Zi2)/(R3+Zi2)))/hie
+Av2=-(hfe*((R7*Zl)/(R7+Zl)))/hie
+Av=Av1*Av2
\ No newline at end of file
diff --git a/226/CH12/EX12.8/example8_sce.sce b/226/CH12/EX12.8/example8_sce.sce
new file mode 100755
index 000000000..9f9ad74d7
--- /dev/null
+++ b/226/CH12/EX12.8/example8_sce.sce
@@ -0,0 +1,28 @@
+//chapter 12
+//example 12.8
+//page 491
+printf("\n")
+printf("given")
+Ve1=5;Vce1=3;Vce2=3;Vbe=.7;Vcc=14;Rl=40*10^3;
+Vb2=Ve1+Vce1
+Vc1=Vb2;
+Ve2=Vb2-Vbe
+Vr5=Vcc-Ve2-Vce2
+R5=Rl/10//use 3.9Kohm satandard value
+R5=3.9*10^3;
+Ic2=Vr5/R5
+R6=Ve2/Ic2//use 8.2Kohm as standard and recalculate
+R6=8.2*10^3;
+Ic2=Ve2/R6
+Vr3=Vcc-Vc1
+disp(" Ic1>>Ib2,select Ic1=1mA")
+Ic1=1*10^-3;
+R3=Vr3/Ic1//use standard value as 5.6Kohm and recalculate Ic1 in order ti keep Vb2=8V
+R3=5.6*10^3;
+Ic1=Vr3/R3
+R4=Ve1/Ic1
+Vr2=Ve1+Vbe
+Vr1=Vcc-Ve1-Vbe
+R2=10*R4
+I2=(Ve1+Vbe)/R2
+R1=(Vr1*R2)/Vr2
\ No newline at end of file
diff --git a/226/CH12/EX12.9/example9_sce.sce b/226/CH12/EX12.9/example9_sce.sce
new file mode 100755
index 000000000..60775608c
--- /dev/null
+++ b/226/CH12/EX12.9/example9_sce.sce
@@ -0,0 +1,16 @@
+//chapter 12
+//example 12.9
+//page 493
+printf("\n")
+printf("given")
+hfe=50;re=26;R1=68*10^3;R2=47*10^3;rs=600;f1=75;R5=3.9*10^3;Rl=40*10^3;
+hie=(1+hfe)*re
+Zi=(R1*R2*hie)/(R1*R2+R1*hie+R2*hie)
+Xc1=(Zi+rs)/10
+C1=1/(2*3.14*f1*Xc1)
+Xc2=.65*re
+Xc3=Xc2;
+C2=1/(2*3.14*f1*Xc2)
+C3=C2;
+Xc4=(R5+Rl)/10
+C4=1/(2*3.14*f1*Xc4)
\ No newline at end of file
-- 
cgit