initial commit / add all books

9 files changed, 144 insertions, 0 deletions

diff --git a/61/CH3/EX3.1/ex3_1.sce b/61/CH3/EX3.1/ex3_1.sce
new file mode 100755
index 000000000..dbd78d193
--- /dev/null
+++ b/61/CH3/EX3.1/ex3_1.sce
@@ -0,0 +1,5 @@
+//ex3.1

+del_V_Z=50*10^-3;    //in volts, from graph

+del_I_Z=5*10^-3;    //in amperes, from rgraph

+Z_Z=del_V_Z/del_I_Z;

+disp(Z_Z,'zener impedance in ohms')
\ No newline at end of file
diff --git a/61/CH3/EX3.2/ex3_2.sce b/61/CH3/EX3.2/ex3_2.sce
new file mode 100755
index 000000000..7e827eeee
--- /dev/null
+++ b/61/CH3/EX3.2/ex3_2.sce
@@ -0,0 +1,15 @@
+//ex3.2

+I_ZT=37*10^-3;    //IN AMPERES

+V_ZT=6.8;    //IN VOLTS

+Z_ZT=3.5;    //IN OHMS

+I_Z=50*10^-3;    //IN AMPERES

+DEL_I_Z=I_Z-I_ZT;

+DEL_V_Z=DEL_I_Z*Z_ZT;

+V_Z=V_ZT+DEL_V_Z;

+disp(V_Z,'voltage across zener terminals (in volts) when current is 50 mA')

+I_Z=25*10^-3;    //IN AMPERES

+DEL_I_Z=I_Z-I_ZT;

+DEL_V_Z=DEL_I_Z*Z_ZT;

+V_Z=V_ZT+DEL_V_Z;

+disp(V_Z,'voltage across zener terminals (in volts) when current is 25 mA')

+

diff --git a/61/CH3/EX3.3/ex3_3.sce b/61/CH3/EX3.3/ex3_3.sce
new file mode 100755
index 000000000..b3394d3ed
--- /dev/null
+++ b/61/CH3/EX3.3/ex3_3.sce
@@ -0,0 +1,9 @@
+//ex3.3

+V_Z=8.2;    //8.2 volt zener diode

+TC=0.0005;    //Temperature coefficient (per degree celsius)

+T1=60;    //Temperatures in celsius

+T2=25;

+DEL_T=T1-T2;

+del_V_Z=V_Z*TC*DEL_T;

+voltage=V_Z+del_V_Z;

+disp(voltage,'zener voltage at 60 degree celsius')
\ No newline at end of file
diff --git a/61/CH3/EX3.4/ex3_4.sce b/61/CH3/EX3.4/ex3_4.sce
new file mode 100755
index 000000000..c173ae4e8
--- /dev/null
+++ b/61/CH3/EX3.4/ex3_4.sce
@@ -0,0 +1,6 @@
+//ex3.4

+P_D_max=400*10^-3;    //power in watts

+df=3.2*10^-3    //derating factor in watts per celsius

+del_T=(90-50);    //in celsius, temperature difference

+P_D_derated=P_D_max-df*del_T;

+disp(P_D_derated,'maximum power dissipated at 90 degree celsius')
\ No newline at end of file
diff --git a/61/CH3/EX3.5/ex3_5.sce b/61/CH3/EX3.5/ex3_5.sce
new file mode 100755
index 000000000..2ad6ac387
--- /dev/null
+++ b/61/CH3/EX3.5/ex3_5.sce
@@ -0,0 +1,16 @@
+//ex3.5

+V_Z=5.1;

+I_ZT=49*10^-3;

+I_ZK=1*10^-3;

+Z_Z=7;

+R=100;

+P_D_max=1;

+//At I_ZK, output voltage

+V_out=V_Z-(I_ZT-I_ZK)*Z_Z;

+V_IN_min=I_ZK*R+V_out;

+I_ZM=P_D_max/V_Z;

+//at I_ZM, output voltage

+V_out=V_Z+(I_ZM-I_ZT)*Z_Z;

+V_IN_max=I_ZM*R+V_out;

+disp(V_IN_max,'maximum input voltage in volts that can be regulated by the zener diode')

+disp(V_IN_min,'minimum input voltage in volts that can be regulated by the zener diode')
\ No newline at end of file
diff --git a/61/CH3/EX3.6/ex3_6.sce b/61/CH3/EX3.6/ex3_6.sce
new file mode 100755
index 000000000..286a9d6ba
--- /dev/null
+++ b/61/CH3/EX3.6/ex3_6.sce
@@ -0,0 +1,18 @@
+//ex3.6

+V_Z=12;

+V_IN=24;

+I_ZK=1*10^-3;

+I_ZM=50*10^-3;

+Z_Z=0;

+R=470;

+//when I_L=0, I_Z is max and is equal to the total circuit current I_T

+I_T=(V_IN-V_Z)/R;

+I_Z_max=I_T;

+if I_Z_max<I_ZM then

+    I_L_min=0;

+end

+I_L_max=I_T-I_ZK;

+R_L_min=V_Z/I_L_max;

+disp(R_L_min,'minimum value of load resistance in ohms')

+disp(I_L_min,'minimum curent in amperes')

+disp(I_L_max,'maximum curent in amperes')
\ No newline at end of file
diff --git a/61/CH3/EX3.7/ex3_7.sce b/61/CH3/EX3.7/ex3_7.sce
new file mode 100755
index 000000000..5fca7cb5c
--- /dev/null
+++ b/61/CH3/EX3.7/ex3_7.sce
@@ -0,0 +1,23 @@
+//ex3.7

+V_IN=24;

+V_Z=15;

+I_ZK=0.25*10^-3;

+I_ZT=17*10^-3;

+Z_ZT=14;

+P_D_max=1;

+//output voltage at I_ZK

+V_out_1=V_Z-(I_ZT-I_ZK)*Z_ZT;

+disp(V_out_1,'output voltage in volts at I_ZK')

+I_ZM=P_D_max/V_Z;

+//output voltage at I_ZM

+V_out_2=V_Z+(I_ZM-I_ZT)*Z_ZT;

+disp(V_out_2,'output voltage in volts a I_ZM')

+R=(V_IN-V_out_2)/I_ZM;

+disp(R,'value of R in ohms for maximum zener current, no load')

+disp('closest practical value is 130 ohms')

+R=130;

+//for minimum load resistance(max load current) zener current is minimum (I_ZK)

+I_T=(V_IN-V_out_1)/R;

+I_L=I_T-I_ZK;

+R_L_min=V_out_1/I_L;

+disp(R_L_min,'minimum load resistance in ohms')
\ No newline at end of file
diff --git a/61/CH3/EX3.8/ex3_8.jpg b/61/CH3/EX3.8/ex3_8.jpg
new file mode 100755
index 000000000..05d21f0c6
--- /dev/null
+++ b/61/CH3/EX3.8/ex3_8.jpg
diff --git a/61/CH3/EX3.8/ex3_8.sce b/61/CH3/EX3.8/ex3_8.sce
new file mode 100755
index 000000000..67b48d3e7
--- /dev/null
+++ b/61/CH3/EX3.8/ex3_8.sce
@@ -0,0 +1,52 @@
+//Ex3.8

+//let input wave be V_in=V_p_in*sin(2*%pi*f*t) 

+f=1;    //Frequency is 1Hz

+T=1/f;

+V_p_in=10;    //Peak input voltage

+V_th=0.7;    //forward biased zener

+V_Z1=5.1;

+V_Z2=3.3;

+clf();

+subplot(121)

+//let n be double the number of cycles of output shown in graph

+for n=0:1:4

+    t=T.*n/2:0.0005:T.*(n+1)/2    //time for each half cycle

+    V_in=V_p_in*sin(2*%pi*f.*t);

+    Vout=V_in;

+    if modulo(n,2)==0 then    //positive half, conducts till V_in=5.8V

+        a=bool2s(Vout<(V_Z1+V_th));    

+        b=bool2s(Vout>(V_Z1+V_th));    

+        y=a.*Vout+(V_Z1+V_th)*b;    //output follows input till 5.8V then is constant at 5.8V

+    else                    //negative half, conducts till V_in=-4V

+        a=bool2s(Vout<-(V_Z2+V_th));    

+        b=bool2s(Vout>-(V_Z2+V_th));

+        y=-(V_Z2+V_th)*a+b.*Vout;    //output follows input till -4V then stays constant at -4V

+    end

+        plot(t,y)

+    end

+xtitle('zener limiting circuit-1')

+disp((V_Z1+V_th),'max voltage in volts')

+disp(-(V_Z2+V_th),'min voltage in volts')

+subplot(122)

+xtitle('zener limiting circuit-2')

+V_p_in=20;

+V_Z1=6.2;

+V_Z2=15;

+//let n be double the number of cycles of output shown in graph

+for n=0:1:4

+    t=T.*n/2:0.0005:T.*(n+1)/2    //time for each half cycle

+    V_in=V_p_in*sin(2*%pi*f.*t);

+    Vout=V_in;

+    if modulo(n,2)==0 then    //positive half, conducts till V_in=6.9V

+        a=bool2s(Vout<(V_Z1+V_th));    

+        b=bool2s(Vout>(V_Z1+V_th));    

+        y=a.*Vout+(V_Z1+V_th)*b;    //output follows input till 6.9V then is constant at 6.9V

+    else                    //negative half, conducts till V_in=-15.7V

+        a=bool2s(Vout<-(V_Z2+V_th));    

+        b=bool2s(Vout>-(V_Z2+V_th));

+        y=-(V_Z2+V_th)*a+b.*Vout;    //output follows input till -15.7V then stays constant at -15.7V

+    end

+        plot(t,y)

+    end

+    disp((V_Z1+V_th),'max voltage in volts')

+disp(-(V_Z2+V_th),'min voltage in volts')
\ No newline at end of file